diff --git a/vtm-android-example/src/org/oscim/android/test/BaseMapActivity.java b/vtm-android-example/src/org/oscim/android/test/BaseMapActivity.java
index bcd72fce..93731f06 100644
--- a/vtm-android-example/src/org/oscim/android/test/BaseMapActivity.java
+++ b/vtm-android-example/src/org/oscim/android/test/BaseMapActivity.java
@@ -45,7 +45,6 @@ public class BaseMapActivity extends MapActivity {
 		registerMapView(mMapView);
 
 		mTileSource = new OSciMap4TileSource();
-		mTileSource.setOption("url", "http://opensciencemap.org/tiles/vtm");
 
 		if (USE_CACHE) {
 			mCache = new TileCache(this, "cachedir", "testdb");
diff --git a/vtm-android-example/src/org/oscim/android/test/BitmapTileMapActivity.java b/vtm-android-example/src/org/oscim/android/test/BitmapTileMapActivity.java
index 927f30a6..f59c2557 100644
--- a/vtm-android-example/src/org/oscim/android/test/BitmapTileMapActivity.java
+++ b/vtm-android-example/src/org/oscim/android/test/BitmapTileMapActivity.java
@@ -16,8 +16,8 @@ package org.oscim.android.test;
 
 import org.oscim.android.MapActivity;
 import org.oscim.android.MapView;
-import org.oscim.layers.tile.bitmap.BitmapTileLayer;
-import org.oscim.layers.tile.bitmap.StamenTonerTiles;
+import org.oscim.layers.tile.BitmapTileLayer;
+import org.oscim.tiling.source.bitmap.DefaultSources.OpenStreetMap;
 
 import android.os.Bundle;
 
@@ -30,8 +30,13 @@ public class BitmapTileMapActivity extends MapActivity {
 		setContentView(R.layout.activity_map);
 
 		mMapView = (MapView) findViewById(R.id.mapView);
-		//registerMapView(mMapView);
+		registerMapView(mMapView);
 
-		mMap.getLayers().add(new BitmapTileLayer(mMap, StamenTonerTiles.INSTANCE, 20));
+		mMap.getLayers().add(new BitmapTileLayer(mMap, new OpenStreetMap(), 20));
+		//mMap.getLayers().add(new BitmapTileLayer(mMap, new ImagicoLandcover(), 20));
+		//mMap.getLayers().add(new BitmapTileLayer(mMap, new ArcGISWorldShaded(), 20));
+		//mMap.getLayers().add(new BitmapTileLayer(mMap, new HillShadeHD(), 20));
+
+		mMap.setMapPosition(0, 0, 1 << 2);
 	}
 }
diff --git a/vtm-android-example/src/org/oscim/android/test/PathOverlayActivity.java b/vtm-android-example/src/org/oscim/android/test/PathOverlayActivity.java
index 86b62368..3b023845 100644
--- a/vtm-android-example/src/org/oscim/android/test/PathOverlayActivity.java
+++ b/vtm-android-example/src/org/oscim/android/test/PathOverlayActivity.java
@@ -24,8 +24,6 @@ import org.oscim.android.MapView;
 import org.oscim.backend.canvas.Color;
 import org.oscim.core.GeoPoint;
 import org.oscim.layers.PathLayer;
-import org.oscim.layers.tile.bitmap.BitmapTileLayer;
-import org.oscim.layers.tile.bitmap.StamenTonerTiles;
 
 import android.os.Bundle;
 
@@ -41,8 +39,6 @@ public class PathOverlayActivity extends MapActivity {
 		mMapView = (MapView) findViewById(R.id.mapView);
 		registerMapView(mMapView);
 
-		mMap.getLayers().add(new BitmapTileLayer(mMap, StamenTonerTiles.INSTANCE, 20));
-
 		for (double lon = -180; lon < 180; lon += 5) {
 			List<GeoPoint> pts = new ArrayList<GeoPoint>();
 
diff --git a/vtm-android/src/org/oscim/android/canvas/AndroidBitmap.java b/vtm-android/src/org/oscim/android/canvas/AndroidBitmap.java
index cbf6b41e..f49f7aff 100644
--- a/vtm-android/src/org/oscim/android/canvas/AndroidBitmap.java
+++ b/vtm-android/src/org/oscim/android/canvas/AndroidBitmap.java
@@ -25,11 +25,15 @@ import android.opengl.GLUtils;
 
 public class AndroidBitmap implements org.oscim.backend.canvas.Bitmap {
 	final Bitmap mBitmap;
-
 	public AndroidBitmap(InputStream inputStream) {
 		mBitmap = BitmapFactory.decodeStream(inputStream);
 	}
 
+	@Override
+	public boolean isValid(){
+		return mBitmap != null;
+	}
+
 	/**
 	 * @param format ignored always ARGB8888
 	 */
diff --git a/vtm-gdx-android/src/org/oscim/android/canvas/AndroidBitmap.java b/vtm-gdx-android/src/org/oscim/android/canvas/AndroidBitmap.java
index 04eb43d1..e062b53b 100644
--- a/vtm-gdx-android/src/org/oscim/android/canvas/AndroidBitmap.java
+++ b/vtm-gdx-android/src/org/oscim/android/canvas/AndroidBitmap.java
@@ -85,4 +85,9 @@ public class AndroidBitmap implements org.oscim.backend.canvas.Bitmap {
 	public void recycle() {
 		mBitmap.recycle();
 	}
+
+	@Override
+	public boolean isValid() {
+		return mBitmap != null;
+	}
 }
diff --git a/vtm-gdx-android/src/org/oscim/gdx/MainActivity.java b/vtm-gdx-android/src/org/oscim/gdx/MainActivity.java
index acd7aa50..50b34797 100644
--- a/vtm-gdx-android/src/org/oscim/gdx/MainActivity.java
+++ b/vtm-gdx-android/src/org/oscim/gdx/MainActivity.java
@@ -57,10 +57,7 @@ public class MainActivity extends AndroidApplication {
 	class GdxMapAndroid extends GdxMap {
 		@Override
 		public void createLayers() {
-
 			TileSource ts = new OSciMap4TileSource();
-			ts.setOption("url", "http://opensciencemap.org/tiles/vtm");
-
 			initDefaultLayers(ts, true, true, true);
 		}
 	}
diff --git a/vtm-gdx-desktop/src/org/oscim/awt/AwtBitmap.java b/vtm-gdx-desktop/src/org/oscim/awt/AwtBitmap.java
index d183ea0b..6d96893d 100644
--- a/vtm-gdx-desktop/src/org/oscim/awt/AwtBitmap.java
+++ b/vtm-gdx-desktop/src/org/oscim/awt/AwtBitmap.java
@@ -134,4 +134,9 @@ public class AwtBitmap implements Bitmap {
 	@Override
 	public void recycle() {
 	}
+
+	@Override
+	public boolean isValid() {
+		return true;
+	}
 }
diff --git a/vtm-gdx-desktop/src/org/oscim/gdx/GdxMapApp.java b/vtm-gdx-desktop/src/org/oscim/gdx/GdxMapApp.java
index 8651604b..4f4442ba 100644
--- a/vtm-gdx-desktop/src/org/oscim/gdx/GdxMapApp.java
+++ b/vtm-gdx-desktop/src/org/oscim/gdx/GdxMapApp.java
@@ -21,7 +21,6 @@ import java.nio.Buffer;
 import org.oscim.awt.AwtGraphics;
 import org.oscim.backend.CanvasAdapter;
 import org.oscim.backend.GLAdapter;
-import org.oscim.core.MapPosition;
 import org.oscim.core.Tile;
 import org.oscim.tiling.source.TileSource;
 import org.oscim.tiling.source.oscimap4.OSciMap4TileSource;
@@ -33,6 +32,9 @@ import com.badlogic.gdx.backends.lwjgl.LwjglGL20;
 import com.badlogic.gdx.utils.SharedLibraryLoader;
 
 public class GdxMapApp extends GdxMap {
+	static {
+		System.setProperty(org.slf4j.impl.SimpleLogger.DEFAULT_LOG_LEVEL_KEY, "TRACE");
+	}
 
 	// wrap LwjglGL20 to add GL20 interface
 	static class GdxGL extends LwjglGL20 implements org.oscim.backend.GL20 {
@@ -78,16 +80,16 @@ public class GdxMapApp extends GdxMap {
 	@Override
 	public void createLayers() {
 		TileSource tileSource = new OSciMap4TileSource();
-		tileSource.setOption("url", "http://opensciencemap.org/tiles/vtm");
 
 		// TileSource tileSource = new MapFileTileSource();
 		// tileSource.setOption("file", "/home/jeff/germany.map");
 
 		initDefaultLayers(tileSource, false, true, true);
 
-		MapPosition p = new MapPosition();
-		p.setZoomLevel(14);
-		p.setPosition(53.08, 8.83);
-		mMap.setMapPosition(p);
+		//mMap.getLayers().add(new BitmapTileLayer(mMap, new ImagicoLandcover(), 20));
+		//mMap.getLayers().add(new BitmapTileLayer(mMap, new OSMTileSource(), 20));
+		//mMap.getLayers().add(new BitmapTileLayer(mMap, new ArcGISWorldShaded(), 20));
+
+		mMap.setMapPosition(0, 0, 1 << 2);
 	}
 }
diff --git a/vtm-gdx-html/src/org/oscim/gdx/client/GwtBitmap.java b/vtm-gdx-html/src/org/oscim/gdx/client/GwtBitmap.java
index 242249c5..bbc8ac0e 100644
--- a/vtm-gdx-html/src/org/oscim/gdx/client/GwtBitmap.java
+++ b/vtm-gdx-html/src/org/oscim/gdx/client/GwtBitmap.java
@@ -88,4 +88,9 @@ public class GwtBitmap implements Bitmap {
 		}
 	}
 
+	@Override
+	public boolean isValid() {
+		return true;
+	}
+
 }
diff --git a/vtm-gdx-html/src/org/oscim/gdx/client/GwtGdxMap.java b/vtm-gdx-html/src/org/oscim/gdx/client/GwtGdxMap.java
index d7f7ab4c..a4eb8464 100644
--- a/vtm-gdx-html/src/org/oscim/gdx/client/GwtGdxMap.java
+++ b/vtm-gdx-html/src/org/oscim/gdx/client/GwtGdxMap.java
@@ -19,17 +19,17 @@ package org.oscim.gdx.client;
 import org.oscim.backend.CanvasAdapter;
 import org.oscim.backend.GL20;
 import org.oscim.backend.GLAdapter;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.oscim.core.MapPosition;
 import org.oscim.core.MercatorProjection;
 import org.oscim.gdx.GdxMap;
-import org.oscim.layers.tile.bitmap.BitmapTileLayer;
-import org.oscim.layers.tile.bitmap.NaturalEarth;
+import org.oscim.layers.tile.BitmapTileLayer;
 import org.oscim.renderer.MapRenderer;
 import org.oscim.tiling.source.TileSource;
+import org.oscim.tiling.source.bitmap.DefaultSources.NaturalEarth;
 import org.oscim.tiling.source.oscimap2.OSciMap2TileSource;
 import org.oscim.tiling.source.oscimap4.OSciMap4TileSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.backends.gwt.GwtApplication;
@@ -108,17 +108,15 @@ class GwtGdxMap extends GdxMap {
 
 		TileSource tileSource;
 		if ("oscimap4".equals(sourceName))
-			tileSource = new OSciMap4TileSource();
+			tileSource = new OSciMap4TileSource(url);
 		else
 			//if ("oscimap2".equals(source))
-			tileSource = new OSciMap2TileSource();
-
-		tileSource.setOption("url", url);
+			tileSource = new OSciMap2TileSource(url);
 
 		initDefaultLayers(tileSource, false, true, true);
 
 		if ("naturalearth".equals(c.getBackgroundLayer()))
-			mMap.setBackgroundMap(new BitmapTileLayer(mMap, NaturalEarth.INSTANCE));
+			mMap.setBackgroundMap(new BitmapTileLayer(mMap, new NaturalEarth()));
 
 		mSearchBox = new SearchBox(mMap);
 
diff --git a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/bitmap/BitmapTileLayer.java b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/bitmap/BitmapTileLayer.java
deleted file mode 100644
index 28fd800d..00000000
--- a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/bitmap/BitmapTileLayer.java
+++ /dev/null
@@ -1,137 +0,0 @@
-/*
- * Copyright 2013 Hannes Janetzek
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.URL;
-
-import org.oscim.backend.canvas.Bitmap;
-import org.oscim.core.MapPosition;
-import org.oscim.core.Tile;
-import org.oscim.gdx.client.GwtBitmap;
-import org.oscim.layers.tile.TileLayer;
-import org.oscim.layers.tile.bitmap.TileSource.FadeStep;
-import org.oscim.map.Map;
-import org.oscim.renderer.elements.BitmapLayer;
-import org.oscim.renderer.elements.ElementLayers;
-import org.oscim.tiling.MapTile;
-import org.oscim.tiling.TileLoader;
-import org.oscim.tiling.TileManager;
-import org.oscim.utils.FastMath;
-
-import com.google.gwt.event.dom.client.ErrorEvent;
-import com.google.gwt.event.dom.client.ErrorHandler;
-import com.google.gwt.event.dom.client.LoadEvent;
-import com.google.gwt.event.dom.client.LoadHandler;
-import com.google.gwt.user.client.ui.Image;
-import com.google.gwt.user.client.ui.RootPanel;
-
-public class BitmapTileLayer extends TileLayer<TileLoader> {
-
-	private final static int CACHE_LIMIT = 50;
-
-	final TileSource mTileSource;
-	private final FadeStep[] mFade;
-
-	public BitmapTileLayer(Map map, TileSource tileSource) {
-		this(map, tileSource, CACHE_LIMIT);
-	}
-
-	public BitmapTileLayer(Map map, TileSource tileSource, int cacheLimit) {
-		super(map, tileSource.getZoomLevelMin(), tileSource.getZoomLevelMax(), cacheLimit);
-		mTileSource = tileSource;
-		mFade = mTileSource.getFadeSteps();
-	}
-
-	@Override
-	public void onMapUpdate(MapPosition pos, boolean changed, boolean clear) {
-		super.onMapUpdate(pos, changed, clear);
-
-		if (mFade == null) {
-			mRenderLayer.setBitmapAlpha(1);
-			return;
-		}
-
-		float alpha = 0;
-		for (FadeStep f : mFade) {
-			if (pos.scale < f.scaleStart || pos.scale > f.scaleEnd)
-				continue;
-
-			if (f.alphaStart == f.alphaEnd) {
-				alpha = f.alphaStart;
-				break;
-			}
-			double range = f.scaleEnd / f.scaleStart;
-			float a = (float) ((range - (pos.scale / f.scaleStart)) / range);
-			a = FastMath.clamp(a, 0, 1);
-			// interpolate alpha between start and end
-			alpha = a * f.alphaStart + (1 - a) * f.alphaEnd;
-			break;
-		}
-
-		mRenderLayer.setBitmapAlpha(alpha);
-	}
-
-	@Override
-	protected TileLoader createLoader(TileManager tm) {
-		return new TileLoader(tm) {
-
-			private void loadImage(final MapTile tile, final String url) {
-				final Image img = new Image(url);
-				RootPanel.get().add(img);
-				img.setVisible(false);
-
-				img.addLoadHandler(new LoadHandler() {
-					public void onLoad(LoadEvent event) {
-
-						Bitmap bitmap = new GwtBitmap(img);
-						tile.layers = new ElementLayers();
-						BitmapLayer l = new BitmapLayer(false);
-						l.setBitmap(bitmap, Tile.SIZE, Tile.SIZE);
-
-						tile.layers.textureLayers = l;
-						tile.loader.jobCompleted(tile, true);
-					}
-				});
-
-				img.addErrorHandler(new ErrorHandler() {
-
-					@Override
-					public void onError(ErrorEvent event) {
-						tile.loader.jobCompleted(tile, false);
-					}
-				});
-			}
-
-			@Override
-			protected boolean executeJob(MapTile tile) {
-				URL url;
-				try {
-					url = mTileSource.getTileUrl(tile);
-					loadImage(tile, url.toString());
-				} catch (Exception e) {
-					e.printStackTrace();
-					tile.loader.jobCompleted(tile, false);
-					return false;
-				}
-
-				return false;
-			}
-
-			@Override
-			public void cleanup() {
-			}
-		};
-	}
-}
diff --git a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/vector/VectorTileLoader.java b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/vector/VectorTileLoader.java
index 7c2074c7..807d71ee 100644
--- a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/vector/VectorTileLoader.java
+++ b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/layers/tile/vector/VectorTileLoader.java
@@ -14,8 +14,7 @@
  */
 package org.oscim.layers.tile.vector;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import org.oscim.backend.canvas.Bitmap;
 import org.oscim.core.GeometryBuffer.GeometryType;
 import org.oscim.core.MapElement;
 import org.oscim.core.MercatorProjection;
@@ -47,6 +46,8 @@ import org.oscim.tiling.source.ITileDataSink;
 import org.oscim.tiling.source.ITileDataSource;
 import org.oscim.tiling.source.ITileDataSource.QueryResult;
 import org.oscim.utils.LineClipper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class VectorTileLoader extends TileLoader implements IRenderTheme.Callback, ITileDataSink {
 
@@ -425,4 +426,10 @@ public class VectorTileLoader extends TileLoader implements IRenderTheme.Callbac
 		}
 		l.add(mElement, height, minHeight);
 	}
+
+	@Override
+	public void setTileImage(Bitmap bitmap) {
+		// TODO Auto-generated method stub
+
+	}
 }
diff --git a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/LwHttp.java b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/LwHttp.java
index 29c54eda..51a922a5 100644
--- a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/LwHttp.java
+++ b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/LwHttp.java
@@ -76,9 +76,9 @@ public class LwHttp {
 			mHttpRequest.abort();
 	}
 
-	private PbfTileDataSource mDataSource;
+	private UrlTileDataSource mDataSource;
 
-	public boolean sendRequest(Tile tile, PbfTileDataSource dataSource) throws IOException {
+	public boolean sendRequest(Tile tile, UrlTileDataSource dataSource) throws IOException {
 		mDataSource = dataSource;
 
 		byte[] request = mRequestBuffer;
@@ -116,9 +116,9 @@ public class LwHttp {
 					if (status == 200) {
 						Uint8Array buf = Uint8ArrayNative.create(xhr.getResponseArrayBuffer());
 
-						mDataSource.process(new Buffer(buf), buf.byteLength());
+						mDataSource.process(new Buffer(buf));
 					} else {
-						mDataSource.process(null, -1);
+						mDataSource.process(null);
 					}
 				}
 			}
diff --git a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/PbfTileDataSource.java b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/UrlTileDataSource.java
similarity index 76%
rename from vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/PbfTileDataSource.java
rename to vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/UrlTileDataSource.java
index d92cda30..92af501f 100644
--- a/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/PbfTileDataSource.java
+++ b/vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/tiling/source/common/UrlTileDataSource.java
@@ -18,24 +18,22 @@ import java.io.IOException;
 import java.io.InputStream;
 
 import org.oscim.tiling.MapTile;
-import org.oscim.tiling.source.ITileCache;
 import org.oscim.tiling.source.ITileDataSink;
 import org.oscim.tiling.source.ITileDataSource;
+import org.oscim.tiling.source.ITileDecoder;
+import org.oscim.tiling.source.TileSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-/**
- *
- *
- */
-public abstract class PbfTileDataSource implements ITileDataSource {
-	static final Logger log = LoggerFactory.getLogger(PbfTileDataSource.class);
+public class UrlTileDataSource implements ITileDataSource {
+	static final Logger log = LoggerFactory.getLogger(UrlTileDataSource.class);
 
-	protected LwHttp mConn;
-	protected final PbfDecoder mTileDecoder;
+	protected final LwHttp mConn;
+	protected final ITileDecoder mTileDecoder;
 
-	public PbfTileDataSource(PbfDecoder tileDecoder, ITileCache cache) {
+	public UrlTileDataSource(TileSource tileSource, ITileDecoder tileDecoder, LwHttp conn) {
 		mTileDecoder = tileDecoder;
+		mConn = conn;
 	}
 
 	private ITileDataSink mSink;
@@ -56,12 +54,12 @@ public abstract class PbfTileDataSource implements ITileDataSource {
 		return result;
 	}
 
-	public void process(InputStream is, int length) {
+	public void process(InputStream is) {
 
 		boolean win = false;
-		if (length >= 0) {
+		if (is != null) {
 			try {
-				win = mTileDecoder.decode(mTile, mSink, is, length);
+				win = mTileDecoder.decode(mTile, mSink, is);
 			} catch (IOException e) {
 				e.printStackTrace();
 			}
diff --git a/vtm/src/org/oscim/backend/canvas/Bitmap.java b/vtm/src/org/oscim/backend/canvas/Bitmap.java
index 5387d70e..79c49a26 100644
--- a/vtm/src/org/oscim/backend/canvas/Bitmap.java
+++ b/vtm/src/org/oscim/backend/canvas/Bitmap.java
@@ -60,4 +60,6 @@ public interface Bitmap {
 	 * @param replace true, when glSubImage2D can be used for upload
 	 */
 	void uploadToTexture(boolean replace);
+
+	boolean isValid();
 }
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/BitmapTileLayer.java b/vtm/src/org/oscim/layers/tile/BitmapTileLayer.java
similarity index 54%
rename from vtm/src/org/oscim/layers/tile/bitmap/BitmapTileLayer.java
rename to vtm/src/org/oscim/layers/tile/BitmapTileLayer.java
index d25ff64c..e2cc974e 100644
--- a/vtm/src/org/oscim/layers/tile/bitmap/BitmapTileLayer.java
+++ b/vtm/src/org/oscim/layers/tile/BitmapTileLayer.java
@@ -14,26 +14,23 @@
  * You should have received a copy of the GNU Lesser General Public License along with
  * this program. If not, see <http://www.gnu.org/licenses/>.
  */
-package org.oscim.layers.tile.bitmap;
+package org.oscim.layers.tile;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.URL;
-import java.net.URLConnection;
-import java.util.zip.GZIPInputStream;
-
-import org.oscim.backend.CanvasAdapter;
 import org.oscim.backend.canvas.Bitmap;
+import org.oscim.core.MapElement;
 import org.oscim.core.MapPosition;
 import org.oscim.core.Tile;
-import org.oscim.layers.tile.TileLayer;
-import org.oscim.layers.tile.bitmap.TileSource.FadeStep;
 import org.oscim.map.Map;
 import org.oscim.renderer.elements.BitmapLayer;
 import org.oscim.renderer.elements.ElementLayers;
 import org.oscim.tiling.MapTile;
 import org.oscim.tiling.TileLoader;
 import org.oscim.tiling.TileManager;
+import org.oscim.tiling.source.ITileDataSink;
+import org.oscim.tiling.source.ITileDataSource;
+import org.oscim.tiling.source.ITileDataSource.QueryResult;
+import org.oscim.tiling.source.TileSource;
+import org.oscim.tiling.source.bitmap.BitmapTileSource;
 import org.oscim.utils.FastMath;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -44,33 +41,43 @@ public class BitmapTileLayer extends TileLayer<TileLoader> {
 
 	private final static int CACHE_LIMIT = 50;
 
-	private static final int TIMEOUT_CONNECT = 5000;
-	private static final int TIMEOUT_READ = 10000;
+	private final BitmapTileSource mTileSource;
 
-	final TileSource mTileSource;
-	private final FadeStep[] mFade;
+	public static class FadeStep {
+		public final double scaleStart, scaleEnd;
+		public final float alphaStart, alphaEnd;
 
-	public BitmapTileLayer(Map map, TileSource tileSource) {
+		public FadeStep(int zoomStart, int zoomEnd, float alphaStart, float alphaEnd) {
+			this.scaleStart = 1 << zoomStart;
+			this.scaleEnd = 1 << zoomEnd;
+			this.alphaStart = alphaStart;
+			this.alphaEnd = alphaEnd;
+		}
+	}
+
+	public BitmapTileLayer(Map map, BitmapTileSource tileSource) {
 		this(map, tileSource, CACHE_LIMIT);
 	}
 
-	public BitmapTileLayer(Map map, TileSource tileSource, int cacheLimit) {
+	public BitmapTileLayer(Map map, BitmapTileSource tileSource, int cacheLimit) {
 		super(map, tileSource.getZoomLevelMin(), tileSource.getZoomLevelMax(), cacheLimit);
 		mTileSource = tileSource;
-		mFade = mTileSource.getFadeSteps();
+		initLoader();
 	}
 
 	@Override
 	public void onMapUpdate(MapPosition pos, boolean changed, boolean clear) {
 		super.onMapUpdate(pos, changed, clear);
 
-		if (mFade == null) {
+		FadeStep[] fade = mTileSource.getFadeSteps();
+
+		if (fade == null) {
 			mRenderLayer.setBitmapAlpha(1);
 			return;
 		}
 
 		float alpha = 0;
-		for (FadeStep f : mFade) {
+		for (FadeStep f : fade) {
 			if (pos.scale < f.scaleStart || pos.scale > f.scaleEnd)
 				continue;
 
@@ -91,47 +98,54 @@ public class BitmapTileLayer extends TileLayer<TileLoader> {
 
 	@Override
 	protected TileLoader createLoader(TileManager tm) {
-		return new TileLoader(tm) {
-
-			@Override
-			protected boolean executeJob(MapTile tile) {
-				URL url;
-				try {
-					url = mTileSource.getTileUrl(tile);
-					URLConnection urlConnection = getURLConnection(url);
-					InputStream inputStream = getInputStream(urlConnection);
-					Bitmap bitmap = CanvasAdapter.g.decodeBitmap(inputStream);
-
-					tile.layers = new ElementLayers();
-					BitmapLayer l = new BitmapLayer(false);
-					l.setBitmap(bitmap, Tile.SIZE, Tile.SIZE);
-
-					tile.layers.textureLayers = l;
-				} catch (Exception e) {
-					e.printStackTrace();
-					return false;
-				}
-
-				return true;
-			}
-
-			@Override
-			public void cleanup() {
-			}
-
-			private InputStream getInputStream(URLConnection urlConnection) throws IOException {
-				if ("gzip".equals(urlConnection.getContentEncoding())) {
-					return new GZIPInputStream(urlConnection.getInputStream());
-				}
-				return urlConnection.getInputStream();
-			}
-
-			private URLConnection getURLConnection(URL url) throws IOException {
-				URLConnection urlConnection = url.openConnection();
-				urlConnection.setConnectTimeout(TIMEOUT_CONNECT);
-				urlConnection.setReadTimeout(TIMEOUT_READ);
-				return urlConnection;
-			}
-		};
+		return new BitmapTileLoader(tm, mTileSource);
 	}
+
+	class BitmapTileLoader extends TileLoader implements ITileDataSink {
+
+		private final ITileDataSource mTileDataSource;
+		private MapTile mTile;
+
+		public BitmapTileLoader(TileManager tileManager, TileSource tileSource) {
+			super(tileManager);
+			mTileDataSource = tileSource.getDataSource();
+		}
+
+		@Override
+		public void cleanup() {
+
+		}
+
+		@Override
+		protected boolean executeJob(MapTile tile) {
+			QueryResult result;
+
+			try {
+				mTile = tile;
+				result = mTileDataSource.executeQuery(tile, this);
+			} finally {
+				mTile = null;
+			}
+			return result == QueryResult.SUCCESS;
+		}
+
+		@Override
+		public void setTileImage(Bitmap bitmap) {
+			BitmapLayer l = new BitmapLayer(false);
+			l.setBitmap(bitmap, Tile.SIZE, Tile.SIZE);
+			mTile.layers = new ElementLayers();
+			mTile.layers.textureLayers = l;
+		}
+
+		@Override
+		public void process(MapElement element) {
+
+		}
+
+		@Override
+		public void completed(boolean success) {
+
+		}
+	}
+
 }
diff --git a/vtm/src/org/oscim/layers/tile/TileLayer.java b/vtm/src/org/oscim/layers/tile/TileLayer.java
index b3edb06a..1cc34fc8 100644
--- a/vtm/src/org/oscim/layers/tile/TileLayer.java
+++ b/vtm/src/org/oscim/layers/tile/TileLayer.java
@@ -53,15 +53,18 @@ public abstract class TileLayer<T extends TileLoader> extends Layer implements M
 
 		// Instantiate TileLoader threads
 		mTileLoader = new ArrayList<T>();
+
+		// RenderLayer is working in GL Thread and actually
+		// drawing loaded tiles to screen.
+		mRenderer = mRenderLayer = new TileRenderer(mTileManager);
+	}
+
+	protected void initLoader() {
 		for (int i = 0; i < mNumTileLoader; i++) {
 			T tileGenerator = createLoader(mTileManager);
 			mTileLoader.add(tileGenerator);
 			tileGenerator.start();
 		}
-
-		// RenderLayer is working in GL Thread and actually
-		// drawing loaded tiles to screen.
-		mRenderer = mRenderLayer = new TileRenderer(mTileManager);
 	}
 
 	abstract protected T createLoader(TileManager tm);
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/AbstractTileSource.java b/vtm/src/org/oscim/layers/tile/bitmap/AbstractTileSource.java
deleted file mode 100644
index 24abc2a1..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/AbstractTileSource.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-public abstract class AbstractTileSource implements TileSource {
-	protected final String hostName;
-	protected final int port;
-
-	protected AbstractTileSource(String hostName, int port) {
-		if (hostName == null || hostName.isEmpty()) {
-			throw new IllegalArgumentException("no host name specified");
-		} else if (port < 0 || port > 65535) {
-			throw new IllegalArgumentException("invalid port number: " + port);
-		}
-
-		this.hostName = hostName;
-		this.port = port;
-	}
-
-	@Override
-	public boolean equals(Object obj) {
-		if (this == obj) {
-			return true;
-		} else if (!(obj instanceof AbstractTileSource)) {
-			return false;
-		}
-		AbstractTileSource other = (AbstractTileSource) obj;
-		if (!this.hostName.equals(other.hostName)) {
-			return false;
-		} else if (this.port != other.port) {
-			return false;
-		}
-		return true;
-	}
-
-	@Override
-	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + this.hostName.hashCode();
-		result = prime * result + this.port;
-		return result;
-	}
-
-	@Override
-	public FadeStep[] getFadeSteps() {
-		return null;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/ArcGISWorldShaded.java b/vtm/src/org/oscim/layers/tile/bitmap/ArcGISWorldShaded.java
deleted file mode 100644
index 01c562dd..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/ArcGISWorldShaded.java
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-//http://server.arcgisonline.com/ArcGIS/rest/services/World_Shaded_Relief/MapServer/tile/5/14/14
-//http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer
-
-public class ArcGISWorldShaded extends AbstractTileSource {
-	public static final ArcGISWorldShaded INSTANCE = new ArcGISWorldShaded("server.arcgisonline.com",
-	                                                                       80);
-	private static final int PARALLEL_REQUESTS_LIMIT = 4;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 6;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public ArcGISWorldShaded(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-		//stringBuilder.append("/ArcGIS/rest/services/World_Imagery/MapServer/tile/");
-		stringBuilder.append("/ArcGIS/rest/services/World_Shaded_Relief/MapServer/tile/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-
-		return new URL(PROTOCOL, this.hostName, this.port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/HillShadeTiles.java b/vtm/src/org/oscim/layers/tile/bitmap/HillShadeTiles.java
deleted file mode 100644
index 33a495f5..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/HillShadeTiles.java
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class HillShadeTiles extends AbstractTileSource {
-
-	//public static final HillShadeTiles INSTANCE = new HillShadeTiles("toolserver.org", 80);
-
-	// from http://openmapsurfer.uni-hd.de/
-	public static final HillShadeTiles INSTANCE = new HillShadeTiles("129.206.74.245", 8004);
-
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 18;
-	private static final int ZOOM_LEVEL_MIN = 2;
-
-	public HillShadeTiles(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		//tms_hs.ashx?x=131&y=94&z=8
-
-		stringBuilder.append("/tms_hs.ashx?x=");
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append("&y=");
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append("&z=");
-		stringBuilder.append(tile.zoomLevel);
-
-		//stringBuilder.append("/~cmarqu/hill/");
-		//stringBuilder.append(tile.zoomLevel);
-		//stringBuilder.append('/');
-		//stringBuilder.append(tile.tileX);
-		//stringBuilder.append('/');
-		//stringBuilder.append(tile.tileY);
-		//stringBuilder.append(".png");
-
-		return new URL(PROTOCOL, this.hostName, this.port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/MapQuestAerial.java b/vtm/src/org/oscim/layers/tile/bitmap/MapQuestAerial.java
deleted file mode 100644
index 8f440fa2..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/MapQuestAerial.java
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class MapQuestAerial extends AbstractTileSource {
-	public static final MapQuestAerial INSTANCE = new MapQuestAerial("otile1.mqcdn.com", 80);
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 8;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public MapQuestAerial(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		stringBuilder.append("/tiles/1.0.0/sat/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".jpg");
-
-		return new URL(PROTOCOL, this.hostName, this.port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/NaturalEarth.java b/vtm/src/org/oscim/layers/tile/bitmap/NaturalEarth.java
deleted file mode 100644
index 7125afa8..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/NaturalEarth.java
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class NaturalEarth extends AbstractTileSource {
-	public static final NaturalEarth INSTANCE = new NaturalEarth("city.informatik.uni-bremen.de",
-	                                                             80);
-	private static final int PARALLEL_REQUESTS_LIMIT = 4;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 8;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public NaturalEarth(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		stringBuilder.append("/tiles/ne/");
-		//stringBuilder.append("/osci/ne_image2/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".png");
-
-		return new URL(PROTOCOL, this.hostName, this.port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-
-	@Override
-	public FadeStep[] getFadeSteps() {
-		return new FadeStep[] {
-		        new FadeStep(ZOOM_LEVEL_MIN, ZOOM_LEVEL_MAX - 1, 1, 0.7f),
-		        // dont fade between zoom-min/max
-		        // fade above zoom max + 2, interpolate 1 to 0
-		        new FadeStep(ZOOM_LEVEL_MAX - 1, ZOOM_LEVEL_MAX + 1, 0.7f, 0)
-		};
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMap.java b/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMap.java
deleted file mode 100644
index 6874b4c5..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMap.java
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class OpenStreetMap extends AbstractTileSource {
-	public static final OpenStreetMap INSTANCE = new OpenStreetMap(".tile.openstreetmap.org",
-	                                                                           80);
-
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 18;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public OpenStreetMap(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	private char[] subdomains = { 'a', 'b', 'c', 'd' };
-	private int curDomain = 0;
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		//stringBuilder.append("/osm/osm/");
-		stringBuilder.append("/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".png");
-
-		String host;
-		synchronized (this) {
-			curDomain = (curDomain++) % 4;
-			host = subdomains[curDomain] + hostName;
-		}
-
-		return new URL(PROTOCOL, host, port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMapMapnik.java b/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMapMapnik.java
deleted file mode 100644
index 326dbde3..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMapMapnik.java
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class OpenStreetMapMapnik extends AbstractTileSource {
-	public static final OpenStreetMapMapnik INSTANCE = new OpenStreetMapMapnik("tile.openstreetmap.org", 80);
-
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 18;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public OpenStreetMapMapnik(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		//stringBuilder.append("/osm/osm/");
-		stringBuilder.append("/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".png");
-
-		return new URL(PROTOCOL, this.hostName, this.port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMapTransport.java b/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMapTransport.java
deleted file mode 100644
index ef9c0c32..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/OpenStreetMapTransport.java
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class OpenStreetMapTransport extends AbstractTileSource {
-	//http://tile.thunderforest.com/transport/3/3/3.png
-
-	public static final OpenStreetMapTransport INSTANCE =
-	        new OpenStreetMapTransport(".tile.thunderforest.com", 80);
-
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 18;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public OpenStreetMapTransport(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	private char[] subdomains = { 'a', 'b', 'c', 'd' };
-	private int curDomain = 0;
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		//stringBuilder.append("/transport/");
-		stringBuilder.append("/outdoors/");
-		//stringBuilder.append("/landscape/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".png");
-
-		String host;
-		synchronized (this) {
-			curDomain = (curDomain++) % 4;
-			host = subdomains[curDomain] + hostName;
-		}
-
-		return new URL(PROTOCOL, host, port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/StamenTonerTiles.java b/vtm/src/org/oscim/layers/tile/bitmap/StamenTonerTiles.java
deleted file mode 100644
index a53b01ec..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/StamenTonerTiles.java
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class StamenTonerTiles extends AbstractTileSource {
-	public static final StamenTonerTiles INSTANCE = new StamenTonerTiles(".tile.stamen.com", 80);
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 16;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public StamenTonerTiles(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	private char[] subdomains = { 'a', 'b', 'c', 'd' };
-	private int curDomain = 0;
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		stringBuilder.append("/toner/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".png");
-
-		curDomain = (curDomain++) % 4;
-
-		return new URL(PROTOCOL, subdomains[curDomain] + hostName, port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/StamenWaterTiles.java b/vtm/src/org/oscim/layers/tile/bitmap/StamenWaterTiles.java
deleted file mode 100644
index 1c50c935..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/StamenWaterTiles.java
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public class StamenWaterTiles extends AbstractTileSource {
-	public static final StamenWaterTiles INSTANCE = new StamenWaterTiles("tile.stamen.com", 80);
-	private static final int PARALLEL_REQUESTS_LIMIT = 8;
-	private static final String PROTOCOL = "http";
-	private static final int ZOOM_LEVEL_MAX = 16;
-	private static final int ZOOM_LEVEL_MIN = 0;
-
-	public StamenWaterTiles(String hostName, int port) {
-		super(hostName, port);
-	}
-
-	@Override
-	public int getParallelRequestsLimit() {
-		return PARALLEL_REQUESTS_LIMIT;
-	}
-
-	@Override
-	public URL getTileUrl(Tile tile) throws MalformedURLException {
-		StringBuilder stringBuilder = new StringBuilder(32);
-
-		stringBuilder.append("/watercolor/");
-		stringBuilder.append(tile.zoomLevel);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileX);
-		stringBuilder.append('/');
-		stringBuilder.append(tile.tileY);
-		stringBuilder.append(".jpg");
-
-		return new URL(PROTOCOL, this.hostName, this.port, stringBuilder.toString());
-	}
-
-	@Override
-	public byte getZoomLevelMax() {
-		return ZOOM_LEVEL_MAX;
-	}
-
-	@Override
-	public byte getZoomLevelMin() {
-		return ZOOM_LEVEL_MIN;
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/bitmap/TileSource.java b/vtm/src/org/oscim/layers/tile/bitmap/TileSource.java
deleted file mode 100644
index b229ac07..00000000
--- a/vtm/src/org/oscim/layers/tile/bitmap/TileSource.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright 2010, 2011, 2012 mapsforge.org
- * Copyright 2013 Hannes Janetzek
- *
- * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
- *
- * This program is free software: you can redistribute it and/or modify it under the
- * terms of the GNU Lesser General Public License as published by the Free Software
- * Foundation, either version 3 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License along with
- * this program. If not, see <http://www.gnu.org/licenses/>.
- */
-package org.oscim.layers.tile.bitmap;
-
-import java.net.MalformedURLException;
-import java.net.URL;
-
-import org.oscim.core.Tile;
-
-public interface TileSource {
-	/**
-	 * @return the maximum number of parallel requests which this
-	 *         {@code TileSource} supports.
-	 */
-	int getParallelRequestsLimit();
-
-	/**
-	 * @return the download URL for the given {@code Tile}.
-	 */
-	URL getTileUrl(Tile tile) throws MalformedURLException;
-
-	/**
-	 * @return the maximum zoom level which this {@code TileSource} supports.
-	 */
-	byte getZoomLevelMax();
-
-	/**
-	 * @return the minimum zoom level which this {@code TileSource} supports.
-	 */
-	byte getZoomLevelMin();
-
-	FadeStep[] getFadeSteps();
-
-	public class FadeStep {
-		public final double scaleStart, scaleEnd;
-		public final float alphaStart, alphaEnd;
-
-		public FadeStep(int zoomStart, int zoomEnd, float alphaStart, float alphaEnd) {
-			this.scaleStart = 1 << zoomStart;
-			this.scaleEnd = 1 << zoomEnd;
-			this.alphaStart = alphaStart;
-			this.alphaEnd = alphaEnd;
-		}
-	}
-}
diff --git a/vtm/src/org/oscim/layers/tile/vector/VectorTileLayer.java b/vtm/src/org/oscim/layers/tile/vector/VectorTileLayer.java
index a580982a..14d25bc0 100644
--- a/vtm/src/org/oscim/layers/tile/vector/VectorTileLayer.java
+++ b/vtm/src/org/oscim/layers/tile/vector/VectorTileLayer.java
@@ -39,10 +39,12 @@ public class VectorTileLayer extends TileLayer<VectorTileLoader> {
 
 	public VectorTileLayer(Map map) {
 		super(map);
+		initLoader();
 	}
 
 	public VectorTileLayer(Map map, int minZoom, int maxZoom, int cacheLimit) {
 		super(map, minZoom, maxZoom, cacheLimit);
+		initLoader();
 	}
 
 	@Override
diff --git a/vtm/src/org/oscim/layers/tile/vector/VectorTileLoader.java b/vtm/src/org/oscim/layers/tile/vector/VectorTileLoader.java
index 6c9e4b40..dacffc37 100644
--- a/vtm/src/org/oscim/layers/tile/vector/VectorTileLoader.java
+++ b/vtm/src/org/oscim/layers/tile/vector/VectorTileLoader.java
@@ -18,6 +18,7 @@ package org.oscim.layers.tile.vector;
 
 import java.util.concurrent.CancellationException;
 
+import org.oscim.backend.canvas.Bitmap;
 import org.oscim.core.GeometryBuffer.GeometryType;
 import org.oscim.core.MapElement;
 import org.oscim.core.MercatorProjection;
@@ -463,4 +464,9 @@ public class VectorTileLoader extends TileLoader implements IRenderTheme.Callbac
 	@Override
 	public void completed(boolean success) {
 	}
+
+	@Override
+	public void setTileImage(Bitmap bitmap) {
+
+	}
 }
diff --git a/vtm/src/org/oscim/map/Map.java b/vtm/src/org/oscim/map/Map.java
index ace3b6e8..9ee8f2b1 100644
--- a/vtm/src/org/oscim/map/Map.java
+++ b/vtm/src/org/oscim/map/Map.java
@@ -24,7 +24,7 @@ import org.oscim.event.Gesture;
 import org.oscim.event.GestureDetector;
 import org.oscim.event.MotionEvent;
 import org.oscim.layers.MapEventLayer;
-import org.oscim.layers.tile.bitmap.BitmapTileLayer;
+import org.oscim.layers.tile.BitmapTileLayer;
 import org.oscim.layers.tile.vector.VectorTileLayer;
 import org.oscim.renderer.MapRenderer;
 import org.oscim.theme.IRenderTheme;
@@ -79,7 +79,7 @@ public abstract class Map {
 	private Set<UpdateListener> mUpdateListenerSet = new LinkedHashSet<UpdateListener>();
 	private UpdateListener[] mUpdateListeners;
 
-	protected boolean mClearMap;
+	protected boolean mClearMap = true;
 
 	public Map() {
 		mViewport = new Viewport(this);
diff --git a/vtm/src/org/oscim/tiling/TileManager.java b/vtm/src/org/oscim/tiling/TileManager.java
index ec559420..f0bf36d9 100644
--- a/vtm/src/org/oscim/tiling/TileManager.java
+++ b/vtm/src/org/oscim/tiling/TileManager.java
@@ -165,6 +165,11 @@ public class TileManager {
 	 *            current MapPosition
 	 */
 	public boolean update(MapPosition pos) {
+
+		// FIXME cant expect init to be called otherwise
+		if (mNewTiles == null)
+			init();
+
 		// clear JobQueue and set tiles to state == NONE.
 		// one could also append new tiles and sort in JobQueue
 		// but this has the nice side-effect that MapWorkers dont
diff --git a/vtm/src/org/oscim/tiling/source/ITileDataSink.java b/vtm/src/org/oscim/tiling/source/ITileDataSink.java
index a21515a4..b368f3f2 100644
--- a/vtm/src/org/oscim/tiling/source/ITileDataSink.java
+++ b/vtm/src/org/oscim/tiling/source/ITileDataSink.java
@@ -16,6 +16,7 @@
  */
 package org.oscim.tiling.source;
 
+import org.oscim.backend.canvas.Bitmap;
 import org.oscim.core.MapElement;
 
 /**
@@ -28,5 +29,7 @@ public interface ITileDataSink {
 
 	void process(MapElement element);
 
+	void setTileImage(Bitmap bitmap);
+
 	void completed(boolean success);
 }
diff --git a/vtm/src/org/oscim/tiling/source/ITileDecoder.java b/vtm/src/org/oscim/tiling/source/ITileDecoder.java
new file mode 100644
index 00000000..9f1e9d14
--- /dev/null
+++ b/vtm/src/org/oscim/tiling/source/ITileDecoder.java
@@ -0,0 +1,12 @@
+package org.oscim.tiling.source;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.oscim.core.Tile;
+
+public interface ITileDecoder {
+
+	boolean decode(Tile tile, ITileDataSink sink, InputStream is)
+	        throws IOException;
+}
diff --git a/vtm/src/org/oscim/tiling/source/bitmap/BitmapTileSource.java b/vtm/src/org/oscim/tiling/source/bitmap/BitmapTileSource.java
new file mode 100644
index 00000000..d94e7b07
--- /dev/null
+++ b/vtm/src/org/oscim/tiling/source/bitmap/BitmapTileSource.java
@@ -0,0 +1,94 @@
+package org.oscim.tiling.source.bitmap;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.oscim.backend.CanvasAdapter;
+import org.oscim.backend.canvas.Bitmap;
+import org.oscim.core.Tile;
+import org.oscim.layers.tile.BitmapTileLayer.FadeStep;
+import org.oscim.tiling.source.ITileDataSink;
+import org.oscim.tiling.source.ITileDataSource;
+import org.oscim.tiling.source.ITileDecoder;
+import org.oscim.tiling.source.common.LwHttp;
+import org.oscim.tiling.source.common.UrlTileDataSource;
+import org.oscim.tiling.source.common.UrlTileSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class BitmapTileSource extends UrlTileSource {
+	static final Logger log = LoggerFactory.getLogger(LwHttp.class);
+
+	private final int mZoomMin;
+	private final int mZoomMax;
+	private final String mFileExtension;
+	private final String mMimeType;
+
+	public BitmapTileSource(String url) {
+		this(url, 0, 17);
+	}
+
+	public BitmapTileSource(String url, int zoomMin, int zoomMax) {
+		this(url, zoomMin, zoomMax, "image/png", ".png");
+	}
+
+	public BitmapTileSource(String url, int zoomMin, int zoomMax, String mimeType,
+	        String fileExtension) {
+		super(url);
+		mZoomMin = zoomMin;
+		mZoomMax = zoomMax;
+		mFileExtension = fileExtension;
+		mMimeType = mimeType;
+	}
+
+	@Override
+	public ITileDataSource getDataSource() {
+		LwHttp conn = new LwHttp(mUrl, mMimeType, mFileExtension, false) {
+			@Override
+			protected int formatTilePath(Tile tile, byte[] path, int curPos) {
+				String p = getTileUrl(tile);
+				if (p == null)
+					return super.formatTilePath(tile, path, curPos);
+
+				byte[] b = p.getBytes();
+				System.arraycopy(b, 0, path, curPos, b.length);
+
+				return curPos + b.length;
+			}
+		};
+		return new UrlTileDataSource(this, new BitmapTileDecoder(), conn);
+	}
+
+	public int getZoomLevelMax() {
+		return mZoomMax;
+	}
+
+	public int getZoomLevelMin() {
+		return mZoomMin;
+	}
+
+	public FadeStep[] getFadeSteps() {
+		return null;
+	}
+
+	public String getTileUrl(Tile tile) {
+		return null;
+	}
+
+	public class BitmapTileDecoder implements ITileDecoder {
+
+		@Override
+		public boolean decode(Tile tile, ITileDataSink sink, InputStream is)
+		        throws IOException {
+
+			Bitmap bitmap = CanvasAdapter.g.decodeBitmap(is);
+			if (!bitmap.isValid()) {
+				log.debug("invalid bitmap");
+				return false;
+			}
+			sink.setTileImage(bitmap);
+
+			return true;
+		}
+	}
+}
diff --git a/vtm/src/org/oscim/tiling/source/bitmap/DefaultSources.java b/vtm/src/org/oscim/tiling/source/bitmap/DefaultSources.java
new file mode 100644
index 00000000..39a49858
--- /dev/null
+++ b/vtm/src/org/oscim/tiling/source/bitmap/DefaultSources.java
@@ -0,0 +1,102 @@
+package org.oscim.tiling.source.bitmap;
+
+import org.oscim.core.Tile;
+import org.oscim.layers.tile.BitmapTileLayer.FadeStep;
+
+public class DefaultSources {
+
+	public static class OpenStreetMap extends BitmapTileSource {
+		public OpenStreetMap() {
+			super("http://tile.openstreetmap.org", 0, 18);
+		}
+	}
+
+	public static class OSMTransport extends BitmapTileSource {
+		public OSMTransport() {
+			super("http://a.tile.thunderforest.com/transport", 0, 18);
+		}
+	}
+
+	public static class StamenToner extends BitmapTileSource {
+		public StamenToner() {
+			super("http://a.tile.stamen.com/toner", 0, 16);
+		}
+	}
+
+	public static class StamenWatercolor extends BitmapTileSource {
+		public StamenWatercolor() {
+			super("http://a.tile.stamen.com/watercolor", 0, 16);
+		}
+	}
+
+	public static class ImagicoLandcover extends BitmapTileSource {
+		public ImagicoLandcover() {
+			super("http://www.imagico.de/map/tiles/landcover",
+			      0, 6, "image/jpeg", ".jpg");
+		}
+	}
+
+	public static class MapQuestAerial extends BitmapTileSource {
+		public MapQuestAerial() {
+			super("http://otile1.mqcdn.com/tiles/1.0.0/sat",
+			      0, 8, "image/jpeg", ".jpg");
+		}
+
+		@Override
+		public FadeStep[] getFadeSteps() {
+			return fadeSteps;
+		}
+	}
+
+	public static class NaturalEarth extends BitmapTileSource {
+		public NaturalEarth() {
+			super("http://opensciencemap.org/tiles/ne", 0, 8);
+		}
+
+		@Override
+		public FadeStep[] getFadeSteps() {
+			return fadeSteps;
+		}
+	}
+
+	public static class ArcGISWorldShaded extends BitmapTileSource {
+		public ArcGISWorldShaded() {
+			super("http://server.arcgisonline.com/ArcGIS/rest/services",
+			      0, 6, "image/jpg", "");
+		}
+
+		@Override
+		public String getTileUrl(Tile tile) {
+			StringBuilder sb = new StringBuilder(32);
+			//sb.append("/World_Imagery/MapServer/tile/");
+			sb.append("/World_Shaded_Relief/MapServer/tile/");
+			sb.append(tile.zoomLevel);
+			sb.append('/').append(tile.tileY);
+			sb.append('/').append(tile.tileX);
+			return sb.toString();
+		}
+	}
+
+	public static class HillShadeHD extends BitmapTileSource {
+		public HillShadeHD() {
+			super("http://129.206.74.245:8004/tms_hs.ashx",
+			      2, 16, "image/png", "");
+		}
+
+		@Override
+		public String getTileUrl(Tile tile) {
+			StringBuilder sb = new StringBuilder(32);
+			sb.append("?x=").append(tile.tileX);
+			sb.append("&y=").append(tile.tileY);
+			sb.append("&z=").append(tile.zoomLevel);
+			return sb.toString();
+		}
+	}
+
+	final static FadeStep[] fadeSteps = new FadeStep[] {
+	        new FadeStep(0, 8 - 1, 1, 0.7f),
+	        // dont fade between zoom-min/max
+	        // fade above zoom max + 2, interpolate 1 to 0
+	        new FadeStep(8 - 1, 8 + 1, 0.7f, 0)
+	};
+}
diff --git a/vtm/src/org/oscim/tiling/source/common/LwHttp.java b/vtm/src/org/oscim/tiling/source/common/LwHttp.java
index 206f8aa2..0ad8abc0 100644
--- a/vtm/src/org/oscim/tiling/source/common/LwHttp.java
+++ b/vtm/src/org/oscim/tiling/source/common/LwHttp.java
@@ -39,6 +39,7 @@ import org.slf4j.LoggerFactory;
  */
 public class LwHttp {
 	static final Logger log = LoggerFactory.getLogger(LwHttp.class);
+	static final boolean DBG = false;
 
 	private final static byte[] HEADER_HTTP_OK = "200 OK".getBytes();
 	private final static byte[] HEADER_CONTENT_TYPE = "Content-Type".getBytes();
@@ -46,7 +47,7 @@ public class LwHttp {
 	private final static int RESPONSE_EXPECTED_LIVES = 100;
 	private final static long RESPONSE_TIMEOUT = (long) 10E9; // 10 second in nanosecond
 
-	private final static int BUFFER_SIZE = 1024;
+	private final static int BUFFER_SIZE = 8192;
 	private final byte[] buffer = new byte[BUFFER_SIZE];
 
 	private final String mHost;
@@ -55,7 +56,7 @@ public class LwHttp {
 	private int mMaxReq = 0;
 	private Socket mSocket;
 	private OutputStream mCommandStream;
-	private InputStream mResponseStream;
+	private Buffer mResponseStream;
 	private OutputStream mCacheOutputStream;
 	private long mLastRequest = 0;
 	private SocketAddress mSockAddr;
@@ -67,8 +68,6 @@ public class LwHttp {
 	private final boolean mInflateContent;
 	private final byte[] mContentType;
 
-	private int mContentLength = -1;
-
 	/**
 	 * @param url
 	 *            Base url for tiles
@@ -93,7 +92,7 @@ public class LwHttp {
 
 		REQUEST_GET_START = ("GET " + path).getBytes();
 
-		REQUEST_GET_END = ("." + extension + " HTTP/1.1" +
+		REQUEST_GET_END = (extension + " HTTP/1.1" +
 		        "\nHost: " + host +
 		        "\nConnection: Keep-Alive" +
 		        "\n\n").getBytes();
@@ -106,18 +105,40 @@ public class LwHttp {
 		                 mRequestBuffer, 0, REQUEST_GET_START.length);
 	}
 
+	// TODO:
+	// to avoid a copy in PbfDecoder one could manage the buffer
+	// array directly and provide access to it.
 	static class Buffer extends BufferedInputStream {
-		final OutputStream mCacheOutputstream;
+		OutputStream mCacheOutputstream;
+		int sumRead = 0;
+		int mContentLength;
 
-		public Buffer(InputStream is, OutputStream cache) {
-			super(is, 4096);
+		public Buffer(InputStream is) {
+			super(is, BUFFER_SIZE);
+		}
+
+		public void setCache(OutputStream cache) {
 			mCacheOutputstream = cache;
 		}
 
+		public void start(int length) {
+			sumRead = 0;
+			mContentLength = length;
+		}
+
 		@Override
 		public int read() throws IOException {
+			if (sumRead >= mContentLength)
+				return -1;
+
 			int data = super.read();
-			if (data >= 0)
+
+			sumRead += 1;
+
+			if (DBG)
+				log.debug("read {} {}", sumRead, mContentLength);
+
+			if (mCacheOutputstream != null)
 				mCacheOutputstream.write(data);
 
 			return data;
@@ -126,13 +147,25 @@ public class LwHttp {
 		@Override
 		public int read(byte[] buffer, int offset, int byteCount)
 		        throws IOException {
-			int len = super.read(buffer, offset, byteCount);
 
-			if (len >= 0)
-				mCacheOutputstream.write(buffer, offset, len);
+			if (sumRead >= mContentLength)
+				return -1;
+
+			int len = super.read(buffer, offset, byteCount);
+			sumRead += len;
+
+			if (DBG)
+				log.debug("read {} {} {}", len, sumRead, mContentLength);
+
+			if (mCacheOutputstream != null)
+				mCacheOutputstream.write(buffer, offset, byteCount);
 
 			return len;
 		}
+
+		public byte[] getArray() {
+			return buf;
+		}
 	}
 
 	public void close() {
@@ -149,8 +182,9 @@ public class LwHttp {
 
 	public InputStream readHeader() throws IOException {
 
-		InputStream is = mResponseStream;
-		is.mark(4096);
+		Buffer is = mResponseStream;
+		is.mark(BUFFER_SIZE);
+		is.start(BUFFER_SIZE);
 
 		byte[] buf = buffer;
 		boolean first = true;
@@ -161,7 +195,7 @@ public class LwHttp {
 		int end = 0;
 		int len = 0;
 
-		mContentLength = -1;
+		int contentLength = -1;
 
 		// header may not be larger than BUFFER_SIZE for this to work
 		for (; (pos < read) || ((read < BUFFER_SIZE) &&
@@ -202,11 +236,11 @@ public class LwHttp {
 
 			} else if (check(HEADER_CONTENT_LENGTH, buf, pos, end)) {
 				// parse Content-Length
-				mContentLength = parseInt(buf, pos +
+				contentLength = parseInt(buf, pos +
 				        HEADER_CONTENT_LENGTH.length + 2, end - 1);
 			}
 
-			if (!ok) {
+			if (!ok || DBG) {
 				String line = new String(buf, pos, end - pos - 1);
 				log.debug("> {} <", line);
 			}
@@ -223,9 +257,8 @@ public class LwHttp {
 		is.mark(0);
 		is.skip(end);
 
-		if (mCacheOutputStream != null) {
-			is = new Buffer(is, mCacheOutputStream);
-		}
+		is.setCache(mCacheOutputStream);
+		is.start(contentLength);
 
 		if (mInflateContent)
 			return new InflaterInputStream(is);
@@ -238,14 +271,10 @@ public class LwHttp {
 		if (mSocket != null && ((mMaxReq-- <= 0)
 		        || (System.nanoTime() - mLastRequest > RESPONSE_TIMEOUT))) {
 
-			try {
-				mSocket.close();
-			} catch (IOException e) {
-				log.debug(e.getMessage());
-			}
+			close();
 
-			// log.debug("not alive  - recreate connection " + mMaxReq);
-			mSocket = null;
+			if (DBG)
+				log.debug("not alive  - recreate connection " + mMaxReq);
 		}
 
 		if (mSocket == null) {
@@ -267,23 +296,16 @@ public class LwHttp {
 
 		byte[] request = mRequestBuffer;
 		int pos = REQUEST_GET_START.length;
-		int newPos = 0;
 
-		if ((newPos = formatTilePath(tile, request, pos)) == 0) {
-			request[pos++] = '/';
-			pos = writeInt(tile.zoomLevel, pos, request);
-			request[pos++] = '/';
-			pos = writeInt(tile.tileX, pos, request);
-			request[pos++] = '/';
-			pos = writeInt(tile.tileY, pos, request);
-		} else {
-			pos = newPos;
-		}
+		pos = formatTilePath(tile, request, pos);
 
 		int len = REQUEST_GET_END.length;
 		System.arraycopy(REQUEST_GET_END, 0, request, pos, len);
 		len += pos;
 
+		if (DBG)
+			log.debug("request: {}", new String(request, 0, len));
+
 		try {
 			mCommandStream.write(request, 0, len);
 			mCommandStream.flush();
@@ -309,7 +331,7 @@ public class LwHttp {
 		mSocket.setTcpNoDelay(true);
 
 		mCommandStream = mSocket.getOutputStream();
-		mResponseStream = new BufferedInputStream(mSocket.getInputStream());
+		mResponseStream = new Buffer(mSocket.getInputStream());
 
 		return true;
 	}
@@ -366,10 +388,6 @@ public class LwHttp {
 			close();
 	}
 
-	public int getContentLength() {
-		return mContentLength;
-	}
-
 	/**
 	 * Write custom tile url
 	 * 
@@ -378,8 +396,14 @@ public class LwHttp {
 	 * @param curPos current position
 	 * @return new position
 	 */
-	protected int formatTilePath(Tile tile, byte[] path, int curPos) {
-		return 0;
+	protected int formatTilePath(Tile tile, byte[] request, int pos) {
+		request[pos++] = '/';
+		pos = writeInt(tile.zoomLevel, pos, request);
+		request[pos++] = '/';
+		pos = writeInt(tile.tileX, pos, request);
+		request[pos++] = '/';
+		pos = writeInt(tile.tileY, pos, request);
+		return pos;
 	}
 
 }
diff --git a/vtm/src/org/oscim/tiling/source/common/PbfDecoder.java b/vtm/src/org/oscim/tiling/source/common/PbfDecoder.java
index cfafb077..ab7931e8 100644
--- a/vtm/src/org/oscim/tiling/source/common/PbfDecoder.java
+++ b/vtm/src/org/oscim/tiling/source/common/PbfDecoder.java
@@ -19,13 +19,12 @@ package org.oscim.tiling.source.common;
 import java.io.IOException;
 import java.io.InputStream;
 
-import org.oscim.core.Tile;
-import org.oscim.tiling.source.ITileDataSink;
+import org.oscim.tiling.source.ITileDecoder;
 import org.oscim.utils.UTF8Decoder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-public abstract class PbfDecoder {
+public abstract class PbfDecoder implements ITileDecoder {
 	static final Logger log = LoggerFactory.getLogger(PbfDecoder.class);
 
 	private final static int S1 = 7;
@@ -73,9 +72,6 @@ public abstract class PbfDecoder {
 	// offset of buffer in message
 	private int mBufferOffset;
 
-	// max bytes to read: message = header + content
-	private int mMsgEnd;
-
 	// overall bytes of message read
 	private int mMsgPos;
 
@@ -87,10 +83,7 @@ public abstract class PbfDecoder {
 		mStringDecoder = new UTF8Decoder();
 	}
 
-	public abstract boolean decode(Tile tile, ITileDataSink sink,
-	        InputStream is, int contentLength) throws IOException;
-
-	public void setInputStream(InputStream is, int contentLength) {
+	public void setInputStream(InputStream is) {
 		mInputStream = is;
 
 		bufferFill = 0;
@@ -98,7 +91,6 @@ public abstract class PbfDecoder {
 		mBufferOffset = 0;
 
 		mMsgPos = 0;
-		mMsgEnd = contentLength;
 	}
 
 	protected int decodeVarint32() throws IOException {
@@ -401,8 +393,8 @@ public abstract class PbfDecoder {
 	}
 
 	public boolean hasData() throws IOException {
-		if (mBufferOffset + bufferPos >= mMsgEnd)
-			return false;
+		//if (mBufferOffset + bufferPos >= mMsgEnd)
+		//	return false;
 
 		return fillBuffer(1) > 0;
 	}
@@ -418,10 +410,6 @@ public abstract class PbfDecoder {
 		if (bytesLeft >= size)
 			return bytesLeft;
 
-		// check if inputstream is read to the end
-		if (mMsgPos >= mMsgEnd)
-			return bytesLeft;
-
 		int maxSize = buffer.length;
 
 		if (size > maxSize) {
@@ -458,10 +446,7 @@ public abstract class PbfDecoder {
 		}
 
 		while ((bufferFill - bufferPos) < size) {
-
 			int max = maxSize - bufferFill;
-			if (max > mMsgEnd - mMsgPos)
-				max = mMsgEnd - mMsgPos;
 
 			if (max <= 0) {
 				// should not be possible
@@ -472,9 +457,8 @@ public abstract class PbfDecoder {
 			int len = mInputStream.read(buffer, bufferFill, max);
 
 			if (len < 0) {
-				mMsgEnd = mMsgPos;
 				if (debug)
-					log.debug(" finished reading " + mMsgPos);
+					log.debug("finished reading {}", mMsgPos);
 
 				// finished reading, mark end
 				buffer[bufferFill] = 0;
@@ -483,10 +467,6 @@ public abstract class PbfDecoder {
 
 			mMsgPos += len;
 			bufferFill += len;
-
-			if (mMsgPos == mMsgEnd)
-				break;
-
 		}
 		return bufferFill - bufferPos;
 	}
diff --git a/vtm/src/org/oscim/tiling/source/common/PbfTileDataSource.java b/vtm/src/org/oscim/tiling/source/common/UrlTileDataSource.java
similarity index 81%
rename from vtm/src/org/oscim/tiling/source/common/PbfTileDataSource.java
rename to vtm/src/org/oscim/tiling/source/common/UrlTileDataSource.java
index 44bf74c8..c61012cd 100644
--- a/vtm/src/org/oscim/tiling/source/common/PbfTileDataSource.java
+++ b/vtm/src/org/oscim/tiling/source/common/UrlTileDataSource.java
@@ -26,20 +26,23 @@ import org.oscim.tiling.MapTile;
 import org.oscim.tiling.source.ITileCache;
 import org.oscim.tiling.source.ITileDataSink;
 import org.oscim.tiling.source.ITileDataSource;
+import org.oscim.tiling.source.ITileDecoder;
+import org.oscim.tiling.source.TileSource;
 import org.oscim.utils.IOUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-public abstract class PbfTileDataSource implements ITileDataSource {
-	static final Logger log = LoggerFactory.getLogger(PbfTileDataSource.class);
+public class UrlTileDataSource implements ITileDataSource {
+	static final Logger log = LoggerFactory.getLogger(UrlTileDataSource.class);
 
-	protected LwHttp mConn;
-	protected final PbfDecoder mTileDecoder;
+	protected final LwHttp mConn;
+	protected final ITileDecoder mTileDecoder;
 	protected final ITileCache mTileCache;
 
-	public PbfTileDataSource(PbfDecoder tileDecoder, ITileCache tileCache) {
+	public UrlTileDataSource(TileSource tileSource, ITileDecoder tileDecoder, LwHttp conn) {
 		mTileDecoder = tileDecoder;
-		mTileCache = tileCache;
+		mTileCache = tileSource.tileCache;
+		mConn = conn;
 	}
 
 	@Override
@@ -54,7 +57,7 @@ public abstract class PbfTileDataSource implements ITileDataSource {
 			} else {
 				InputStream is = c.getInputStream();
 				try {
-					if (mTileDecoder.decode(tile, sink, is, c.getBytes())) {
+					if (mTileDecoder.decode(tile, sink, is)) {
 						return QueryResult.SUCCESS;
 					}
 				} catch (IOException e) {
@@ -76,15 +79,14 @@ public abstract class PbfTileDataSource implements ITileDataSource {
 			} else if ((is = mConn.readHeader()) == null) {
 				log.debug("{} Network Error", tile);
 			} else {
-				int bytes = mConn.getContentLength();
-				success = mTileDecoder.decode(tile, sink, is, bytes);
+				success = mTileDecoder.decode(tile, sink, is);
 			}
 		} catch (SocketException e) {
 			log.debug("{} Socket exception: {}", tile, e.getMessage());
 		} catch (SocketTimeoutException e) {
 			log.debug("{} Socket Timeout", tile);
 		} catch (UnknownHostException e) {
-			log.debug("{} No Network", tile);
+			log.debug("{} Unknown host: {}", tile, e.getMessage());
 		} catch (IOException e) {
 			e.printStackTrace();
 		} finally {
diff --git a/vtm/src/org/oscim/tiling/source/common/UrlTileSource.java b/vtm/src/org/oscim/tiling/source/common/UrlTileSource.java
index d96cac8c..3d34e51c 100644
--- a/vtm/src/org/oscim/tiling/source/common/UrlTileSource.java
+++ b/vtm/src/org/oscim/tiling/source/common/UrlTileSource.java
@@ -22,22 +22,21 @@ import java.net.URL;
 import org.oscim.tiling.source.TileSource;
 
 public abstract class UrlTileSource extends TileSource {
-	private final static String KEY_URL = "url";
 
-	protected URL mUrl;
+	protected final URL mUrl;
+
+	public UrlTileSource(String urlString) {
+		URL url = null;
+		try {
+			url = new URL(urlString);
+		} catch (MalformedURLException e) {
+			e.printStackTrace();
+		}
+		mUrl = url;
+	}
 
 	@Override
 	public OpenResult open() {
-		if (!options.containsKey(KEY_URL))
-			return new OpenResult("no url set");
-		String urlString = options.get(KEY_URL);
-		try {
-			mUrl = new URL(urlString);
-		} catch (MalformedURLException e) {
-			e.printStackTrace();
-			return new OpenResult("invalid url " + urlString);
-		}
-
 		return OpenResult.SUCCESS;
 	}
 
@@ -45,9 +44,4 @@ public abstract class UrlTileSource extends TileSource {
 	public void close() {
 
 	}
-
-	public boolean setUrl(String urlString) {
-		options.put("url", urlString);
-		return open() == OpenResult.SUCCESS;
-	}
 }
diff --git a/vtm/src/org/oscim/tiling/source/mapnik/MapnikVectorTileSource.java b/vtm/src/org/oscim/tiling/source/mapnik/MapnikVectorTileSource.java
index 446607bf..281ba244 100644
--- a/vtm/src/org/oscim/tiling/source/mapnik/MapnikVectorTileSource.java
+++ b/vtm/src/org/oscim/tiling/source/mapnik/MapnikVectorTileSource.java
@@ -16,50 +16,43 @@
  */
 package org.oscim.tiling.source.mapnik;
 
-import java.net.URL;
-
 import org.oscim.core.Tile;
 import org.oscim.tiling.source.ITileDataSource;
-import org.oscim.tiling.source.TileSource;
 import org.oscim.tiling.source.common.LwHttp;
-import org.oscim.tiling.source.common.PbfTileDataSource;
+import org.oscim.tiling.source.common.UrlTileDataSource;
 import org.oscim.tiling.source.common.UrlTileSource;
 
 public class MapnikVectorTileSource extends UrlTileSource {
 
+	public MapnikVectorTileSource() {
+		super("http://d1s11ojcu7opje.cloudfront.net/dev/764e0b8d");
+	}
+
 	@Override
 	public ITileDataSource getDataSource() {
-		return new TileDataSource(this, mUrl);
-	}
+		LwHttp conn = new LwHttp(mUrl, "image/png", ".vector.pbf", true) {
+			@Override
+			protected int formatTilePath(Tile tile, byte[] path, int pos) {
+				// url formatter for mapbox streets
+				byte[] hexTable = {
+				        '0', '1', '2', '3',
+				        '4', '5', '6', '7',
+				        '8', '9', 'a', 'b',
+				        'c', 'd', 'e', 'f'
+				};
 
-	static class TileDataSource extends PbfTileDataSource {
-
-		public TileDataSource(TileSource tileSource, URL url) {
-			super(new TileDecoder(), tileSource.tileCache);
-
-			mConn = new LwHttp(url, "image/png", "vector.pbf", true) {
-				@Override
-				protected int formatTilePath(Tile tile, byte[] path, int pos) {
-					// url formatter for mapbox streets
-					byte[] hexTable = {
-					        '0', '1', '2', '3',
-					        '4', '5', '6', '7',
-					        '8', '9', 'a', 'b',
-					        'c', 'd', 'e', 'f'
-					};
-
-					path[pos++] = '/';
-					path[pos++] = hexTable[(tile.tileX) % 16];
-					path[pos++] = hexTable[(tile.tileY) % 16];
-					path[pos++] = '/';
-					pos = LwHttp.writeInt(tile.zoomLevel, pos, path);
-					path[pos++] = '/';
-					pos = LwHttp.writeInt(tile.tileX, pos, path);
-					path[pos++] = '/';
-					pos = LwHttp.writeInt(tile.tileY, pos, path);
-					return pos;
-				}
-			};
-		}
+				path[pos++] = '/';
+				path[pos++] = hexTable[(tile.tileX) % 16];
+				path[pos++] = hexTable[(tile.tileY) % 16];
+				path[pos++] = '/';
+				pos = LwHttp.writeInt(tile.zoomLevel, pos, path);
+				path[pos++] = '/';
+				pos = LwHttp.writeInt(tile.tileX, pos, path);
+				path[pos++] = '/';
+				pos = LwHttp.writeInt(tile.tileY, pos, path);
+				return pos;
+			}
+		};
+		return new UrlTileDataSource(this, new TileDecoder(), conn);
 	}
 }
diff --git a/vtm/src/org/oscim/tiling/source/mapnik/TileDecoder.java b/vtm/src/org/oscim/tiling/source/mapnik/TileDecoder.java
index a42b5420..de6e364f 100644
--- a/vtm/src/org/oscim/tiling/source/mapnik/TileDecoder.java
+++ b/vtm/src/org/oscim/tiling/source/mapnik/TileDecoder.java
@@ -71,13 +71,13 @@ public class TileDecoder extends PbfDecoder {
 	private float mScale;
 
 	@Override
-	public boolean decode(Tile tile, ITileDataSink mapDataCallback, InputStream is,
-	        int contentLength)
+	public boolean decode(Tile tile, ITileDataSink mapDataCallback, InputStream is)
 	        throws IOException {
+
 		if (debug)
 			log.debug(tile + " decode");
 
-		setInputStream(is, Integer.MAX_VALUE);
+		setInputStream(is);
 		mTile = tile;
 		mMapDataCallback = mapDataCallback;
 		mScale = REF_TILE_SIZE / Tile.SIZE;
diff --git a/vtm/src/org/oscim/tiling/source/oscimap/OSciMap1TileSource.java b/vtm/src/org/oscim/tiling/source/oscimap/OSciMap1TileSource.java
index be96832f..dd12ccee 100644
--- a/vtm/src/org/oscim/tiling/source/oscimap/OSciMap1TileSource.java
+++ b/vtm/src/org/oscim/tiling/source/oscimap/OSciMap1TileSource.java
@@ -16,12 +16,9 @@
  */
 package org.oscim.tiling.source.oscimap;
 
-import java.net.URL;
-
 import org.oscim.tiling.source.ITileDataSource;
-import org.oscim.tiling.source.TileSource;
 import org.oscim.tiling.source.common.LwHttp;
-import org.oscim.tiling.source.common.PbfTileDataSource;
+import org.oscim.tiling.source.common.UrlTileDataSource;
 import org.oscim.tiling.source.common.UrlTileSource;
 
 /**
@@ -30,15 +27,13 @@ import org.oscim.tiling.source.common.UrlTileSource;
  */
 public class OSciMap1TileSource extends UrlTileSource {
 
-	@Override
-	public ITileDataSource getDataSource() {
-		return new TileDataSource(this, mUrl);
+	public OSciMap1TileSource(String url) {
+		super(url);
 	}
 
-	class TileDataSource extends PbfTileDataSource {
-		public TileDataSource(TileSource tileSource, URL url) {
-			super(new TileDecoder(), tileSource.tileCache);
-			mConn = new LwHttp(url, "application/osmtile", "osmtile", false);
-		}
+	@Override
+	public ITileDataSource getDataSource() {
+		LwHttp conn = new LwHttp(mUrl, "application/osmtile", ".osmtile", false);
+		return new UrlTileDataSource(this, new TileDecoder(), conn);
 	}
 }
diff --git a/vtm/src/org/oscim/tiling/source/oscimap/TileDecoder.java b/vtm/src/org/oscim/tiling/source/oscimap/TileDecoder.java
index 644b62c4..82a1e0ad 100644
--- a/vtm/src/org/oscim/tiling/source/oscimap/TileDecoder.java
+++ b/vtm/src/org/oscim/tiling/source/oscimap/TileDecoder.java
@@ -68,10 +68,10 @@ public class TileDecoder extends PbfDecoder {
 	}
 
 	@Override
-	public boolean decode(Tile tile, ITileDataSink sink, InputStream is, int contentLength)
+	public boolean decode(Tile tile, ITileDataSink sink, InputStream is)
 	        throws IOException {
 
-		setInputStream(is, contentLength);
+		setInputStream(is);
 
 		mTile = tile;
 		mSink = sink;
diff --git a/vtm/src/org/oscim/tiling/source/oscimap2/OSciMap2TileSource.java b/vtm/src/org/oscim/tiling/source/oscimap2/OSciMap2TileSource.java
index d3544d73..ae5d1160 100644
--- a/vtm/src/org/oscim/tiling/source/oscimap2/OSciMap2TileSource.java
+++ b/vtm/src/org/oscim/tiling/source/oscimap2/OSciMap2TileSource.java
@@ -18,7 +18,6 @@ package org.oscim.tiling.source.oscimap2;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.net.URL;
 import java.util.Arrays;
 
 import org.oscim.core.GeometryBuffer.GeometryType;
@@ -28,26 +27,23 @@ import org.oscim.core.TagSet;
 import org.oscim.core.Tile;
 import org.oscim.tiling.source.ITileDataSink;
 import org.oscim.tiling.source.ITileDataSource;
-import org.oscim.tiling.source.TileSource;
 import org.oscim.tiling.source.common.LwHttp;
 import org.oscim.tiling.source.common.PbfDecoder;
-import org.oscim.tiling.source.common.PbfTileDataSource;
+import org.oscim.tiling.source.common.UrlTileDataSource;
 import org.oscim.tiling.source.common.UrlTileSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class OSciMap2TileSource extends UrlTileSource {
 
-	@Override
-	public ITileDataSource getDataSource() {
-		return new TileDataSource(this, mUrl);
+	public OSciMap2TileSource(String url) {
+		super(url);
 	}
 
-	class TileDataSource extends PbfTileDataSource {
-		public TileDataSource(TileSource tileSource, URL url) {
-			super(new TileDecoder(), tileSource.tileCache);
-			mConn = new LwHttp(url, "application/osmtile", "osmtile", false);
-		}
+	@Override
+	public ITileDataSource getDataSource() {
+		LwHttp conn = new LwHttp(mUrl, "application/osmtile", ".osmtile", false);
+		return new UrlTileDataSource(this, new TileDecoder(), conn);
 	}
 
 	static class TileDecoder extends PbfDecoder {
@@ -92,17 +88,12 @@ public class OSciMap2TileSource extends UrlTileSource {
 		}
 
 		@Override
-		public boolean decode(Tile tile, ITileDataSink sink, InputStream is, int contentLength)
+		public boolean decode(Tile tile, ITileDataSink sink, InputStream is)
 		        throws IOException {
 
-			int byteCount = readUnsignedInt(is, buffer);
-			//log.debug(tile + " contentLength:" + byteCount);
-			if (byteCount < 0) {
-				log.debug(tile + " invalid content length: " + byteCount);
-				return false;
-			}
+			readUnsignedInt(is, buffer);
 
-			setInputStream(is, byteCount);
+			setInputStream(is);
 
 			mTile = tile;
 			mMapDataSink = sink;
diff --git a/vtm/src/org/oscim/tiling/source/oscimap4/OSciMap4TileSource.java b/vtm/src/org/oscim/tiling/source/oscimap4/OSciMap4TileSource.java
index 81e0b0ce..ee9c4d07 100644
--- a/vtm/src/org/oscim/tiling/source/oscimap4/OSciMap4TileSource.java
+++ b/vtm/src/org/oscim/tiling/source/oscimap4/OSciMap4TileSource.java
@@ -16,26 +16,25 @@
  */
 package org.oscim.tiling.source.oscimap4;
 
-import java.net.URL;
-
 import org.oscim.tiling.source.ITileDataSource;
-import org.oscim.tiling.source.TileSource;
 import org.oscim.tiling.source.common.LwHttp;
-import org.oscim.tiling.source.common.PbfTileDataSource;
+import org.oscim.tiling.source.common.UrlTileDataSource;
 import org.oscim.tiling.source.common.UrlTileSource;
 
 public class OSciMap4TileSource extends UrlTileSource {
 
-	@Override
-	public ITileDataSource getDataSource() {
-		return new TileDataSource(this, mUrl);
+	public OSciMap4TileSource() {
+		super("http://opensciencemap.org/tiles/vtm");
 	}
 
-	class TileDataSource extends PbfTileDataSource {
-		public TileDataSource(TileSource tileSource, URL url) {
-			super(new TileDecoder(), tileSource.tileCache);
-			//mConn = new LwHttp(url, "application/x-protobuf", "vtm", false);
-			mConn = new LwHttp(url, "image/png", "vtm", false);
-		}
+	public OSciMap4TileSource(String url) {
+		super(url);
+	}
+
+	@Override
+	public ITileDataSource getDataSource() {
+		//LwHttp conn = new LwHttp(url, "application/x-protobuf", ".vtm", false);
+		LwHttp conn = new LwHttp(mUrl, "image/png", ".vtm", false);
+		return new UrlTileDataSource(this, new TileDecoder(), conn);
 	}
 }
diff --git a/vtm/src/org/oscim/tiling/source/oscimap4/TileDecoder.java b/vtm/src/org/oscim/tiling/source/oscimap4/TileDecoder.java
index 25d246bf..3233d4e3 100644
--- a/vtm/src/org/oscim/tiling/source/oscimap4/TileDecoder.java
+++ b/vtm/src/org/oscim/tiling/source/oscimap4/TileDecoder.java
@@ -76,17 +76,13 @@ public class TileDecoder extends PbfDecoder {
 	}
 
 	@Override
-	public boolean decode(Tile tile, ITileDataSink sink, InputStream is, int contentLength)
+	public boolean decode(Tile tile, ITileDataSink sink, InputStream is)
 	        throws IOException {
 
-		int byteCount = readUnsignedInt(is, buffer);
+		readUnsignedInt(is, buffer);
 		//log.debug(tile + " contentLength:" + byteCount);
-		if (byteCount < 0) {
-			log.debug("invalid contentLength: " + byteCount);
-			return false;
-		}
 
-		setInputStream(is, byteCount);
+		setInputStream(is);
 
 		mTile = tile;
 		mMapDataSink = sink;