diff --git a/vtm-android-example/src/org/oscim/android/filepicker/ValidRenderTheme.java b/vtm-android-example/src/org/oscim/android/filepicker/ValidRenderTheme.java
index d6421143..15f6b715 100644
--- a/vtm-android-example/src/org/oscim/android/filepicker/ValidRenderTheme.java
+++ b/vtm-android-example/src/org/oscim/android/filepicker/ValidRenderTheme.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2010, 2011, 2012 mapsforge.org
+ * Copyright 2016 devemux86
  *
  * 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
@@ -40,7 +41,7 @@ public final class ValidRenderTheme implements ValidFileFilter {
 
         try {
             inputStream = new FileInputStream(file);
-            XmlThemeBuilder renderThemeHandler = new XmlThemeBuilder();
+            XmlThemeBuilder renderThemeHandler = new XmlThemeBuilder(file.getParent());
             XMLReader xmlReader = SAXParserFactory.newInstance().newSAXParser().getXMLReader();
             xmlReader.setContentHandler(renderThemeHandler);
             xmlReader.parse(new InputSource(inputStream));
diff --git a/vtm-android-gdx/src/org/oscim/android/canvas/AndroidGraphics.java b/vtm-android-gdx/src/org/oscim/android/canvas/AndroidGraphics.java
index 45a15738..34d229e2 100644
--- a/vtm-android-gdx/src/org/oscim/android/canvas/AndroidGraphics.java
+++ b/vtm-android-gdx/src/org/oscim/android/canvas/AndroidGraphics.java
@@ -56,9 +56,9 @@ public final class AndroidGraphics extends CanvasAdapter {
     }
 
     @Override
-    public Bitmap loadBitmapAssetImpl(String fileName) {
+    public Bitmap loadBitmapAssetImpl(String relativePathPrefix, String src) {
         try {
-            return createBitmap(fileName);
+            return createBitmap(relativePathPrefix, src);
         } catch (IOException e) {
             e.printStackTrace();
         }
diff --git a/vtm-android/src/org/oscim/android/canvas/AndroidGraphics.java b/vtm-android/src/org/oscim/android/canvas/AndroidGraphics.java
index 45a15738..34d229e2 100644
--- a/vtm-android/src/org/oscim/android/canvas/AndroidGraphics.java
+++ b/vtm-android/src/org/oscim/android/canvas/AndroidGraphics.java
@@ -56,9 +56,9 @@ public final class AndroidGraphics extends CanvasAdapter {
     }
 
     @Override
-    public Bitmap loadBitmapAssetImpl(String fileName) {
+    public Bitmap loadBitmapAssetImpl(String relativePathPrefix, String src) {
         try {
-            return createBitmap(fileName);
+            return createBitmap(relativePathPrefix, src);
         } catch (IOException e) {
             e.printStackTrace();
         }
diff --git a/vtm-desktop/src/org/oscim/awt/AwtGraphics.java b/vtm-desktop/src/org/oscim/awt/AwtGraphics.java
index c4cb8bd5..ba15e3fd 100644
--- a/vtm-desktop/src/org/oscim/awt/AwtGraphics.java
+++ b/vtm-desktop/src/org/oscim/awt/AwtGraphics.java
@@ -101,9 +101,9 @@ public class AwtGraphics extends CanvasAdapter {
     }
 
     @Override
-    public Bitmap loadBitmapAssetImpl(String fileName) {
+    public Bitmap loadBitmapAssetImpl(String relativePathPrefix, String src) {
         try {
-            return createBitmap(fileName);
+            return createBitmap(relativePathPrefix, src);
         } catch (IOException e) {
             e.printStackTrace();
         }
diff --git a/vtm-ios/src/org/oscim/ios/backend/IosGraphics.java b/vtm-ios/src/org/oscim/ios/backend/IosGraphics.java
index 69542881..6b1f2fdc 100644
--- a/vtm-ios/src/org/oscim/ios/backend/IosGraphics.java
+++ b/vtm-ios/src/org/oscim/ios/backend/IosGraphics.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2016 Longri
+ * Copyright 2016 devemux86
  *
  * 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
@@ -21,6 +22,7 @@ import org.oscim.backend.canvas.Paint;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 
@@ -61,9 +63,10 @@ public class IosGraphics extends CanvasAdapter {
     }
 
     @Override
-    protected Bitmap loadBitmapAssetImpl(String fileName) {
+    protected Bitmap loadBitmapAssetImpl(String relativePathPrefix, String src) {
         try {
-            return new IosBitmap(fileName);
+            String pathName = (relativePathPrefix == null || relativePathPrefix.length() == 0 ? "" : relativePathPrefix + File.separatorChar) + src;
+            return new IosBitmap(pathName);
         } catch (IOException e) {
             log.error("loadBitmapAssetImpl", e);
             return null;
diff --git a/vtm-playground/src/org/oscim/test/renderer/SymbolRenderLayer.java b/vtm-playground/src/org/oscim/test/renderer/SymbolRenderLayer.java
index fd1711b7..5b026dbf 100644
--- a/vtm-playground/src/org/oscim/test/renderer/SymbolRenderLayer.java
+++ b/vtm-playground/src/org/oscim/test/renderer/SymbolRenderLayer.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -33,7 +34,7 @@ public class SymbolRenderLayer extends BucketRenderer {
         it.billboard = false;
 
         try {
-            it.bitmap = CanvasAdapter.getBitmapAsset("jar:symbols/cafe.png");
+            it.bitmap = CanvasAdapter.getBitmapAsset("", "jar:symbols/cafe.png");
         } catch (Exception e) {
             e.printStackTrace();
 
diff --git a/vtm-themes/src/org/oscim/theme/VtmThemes.java b/vtm-themes/src/org/oscim/theme/VtmThemes.java
index bea032c2..5c13de89 100644
--- a/vtm-themes/src/org/oscim/theme/VtmThemes.java
+++ b/vtm-themes/src/org/oscim/theme/VtmThemes.java
@@ -1,6 +1,7 @@
 /*
  * Copyright 2010, 2011, 2012 mapsforge.org
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -33,10 +34,15 @@ public enum VtmThemes implements ThemeFile {
 
     private final String mPath;
 
-    private VtmThemes(String path) {
+    VtmThemes(String path) {
         mPath = path;
     }
 
+    @Override
+    public String getRelativePathPrefix() {
+        return "";
+    }
+
     @Override
     public InputStream getRenderThemeAsStream() {
         return AssetAdapter.readFileAsStream(mPath);
diff --git a/vtm-web-js/src/org/oscim/web/js/JsOverlays.java b/vtm-web-js/src/org/oscim/web/js/JsOverlays.java
index 00897fba..97c268d1 100644
--- a/vtm-web-js/src/org/oscim/web/js/JsOverlays.java
+++ b/vtm-web-js/src/org/oscim/web/js/JsOverlays.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 devemux86
+ *
+ * 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.web.js;
 
 import org.oscim.core.MapPosition;
@@ -13,7 +29,7 @@ import org.oscim.map.Map;
 import org.oscim.renderer.LayerRenderer;
 import org.oscim.theme.IRenderTheme;
 import org.oscim.tiling.TileSource;
-import org.oscim.tiling.source.geojson.HighroadJsonTileSource;
+import org.oscim.tiling.source.geojson.OsmRoadLineJsonTileSource;
 import org.oscim.tiling.source.oscimap4.OSciMap4TileSource;
 import org.timepedia.exporter.client.Export;
 import org.timepedia.exporter.client.ExportOverlay;
@@ -90,7 +106,7 @@ public class JsOverlays implements Exportable {
     @ExportPackage("vtm")
     @Export("HighroadJsonTileSource")
     public static class XHighroadJsonTileSource implements
-            ExportOverlay<HighroadJsonTileSource> {
+            ExportOverlay<OsmRoadLineJsonTileSource> {
         public XHighroadJsonTileSource() {
         }
     }
diff --git a/vtm-web/src/org/oscim/gdx/client/GwtGdxGraphics.java b/vtm-web/src/org/oscim/gdx/client/GwtGdxGraphics.java
index 51382a96..92d2e2ae 100644
--- a/vtm-web/src/org/oscim/gdx/client/GwtGdxGraphics.java
+++ b/vtm-web/src/org/oscim/gdx/client/GwtGdxGraphics.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -24,6 +25,7 @@ import org.oscim.backend.CanvasAdapter;
 import org.oscim.backend.canvas.Bitmap;
 import org.oscim.backend.canvas.Paint;
 
+import java.io.File;
 import java.io.InputStream;
 
 public class GwtGdxGraphics extends CanvasAdapter {
@@ -52,8 +54,9 @@ public class GwtGdxGraphics extends CanvasAdapter {
     }
 
     @Override
-    public Bitmap loadBitmapAssetImpl(String fileName) {
-        return new GwtBitmap(fileName);
+    public Bitmap loadBitmapAssetImpl(String relativePathPrefix, String src) {
+        String pathName = (relativePathPrefix == null || relativePathPrefix.length() == 0 ? "" : relativePathPrefix + File.separatorChar) + src;
+        return new GwtBitmap(pathName);
     }
 
     @Override
diff --git a/vtm/src/org/oscim/backend/CanvasAdapter.java b/vtm/src/org/oscim/backend/CanvasAdapter.java
index 09948606..10bd47c3 100644
--- a/vtm/src/org/oscim/backend/CanvasAdapter.java
+++ b/vtm/src/org/oscim/backend/CanvasAdapter.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -19,7 +20,11 @@ package org.oscim.backend;
 import org.oscim.backend.canvas.Bitmap;
 import org.oscim.backend.canvas.Canvas;
 import org.oscim.backend.canvas.Paint;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
@@ -27,6 +32,7 @@ import java.io.InputStream;
  * The Class CanvasAdapter.
  */
 public abstract class CanvasAdapter {
+    private static final Logger log = LoggerFactory.getLogger(CanvasAdapter.class);
 
     /**
      * The instance provided by backend
@@ -94,24 +100,35 @@ public abstract class CanvasAdapter {
     /**
      * Create {@link Bitmap} from bundled assets.
      *
-     * @param fileName the file name
+     * @param relativePathPrefix the prefix for relative resource path
+     * @param src                the resource
      * @return the bitmap
      */
-    protected abstract Bitmap loadBitmapAssetImpl(String fileName);
+    protected abstract Bitmap loadBitmapAssetImpl(String relativePathPrefix, String src);
 
-    public static Bitmap getBitmapAsset(String fileName) {
-        return g.loadBitmapAssetImpl(fileName);
+    public static Bitmap getBitmapAsset(String relativePathPrefix, String src) {
+        return g.loadBitmapAssetImpl(relativePathPrefix, src);
     }
 
-    protected static Bitmap createBitmap(String src) throws IOException {
+    protected static Bitmap createBitmap(String relativePathPrefix, String src) throws IOException {
         if (src == null || src.length() == 0) {
             // no image source defined
             return null;
         }
 
-        InputStream inputStream = AssetAdapter.g.openFileAsStream(src);
+        String pathName = (relativePathPrefix == null || relativePathPrefix.length() == 0 ? "" : relativePathPrefix) + File.separatorChar + src;
+
+        InputStream inputStream = null;
+
+        File file = new File(pathName);
+        if (file.exists() && file.isFile() && file.canRead())
+            inputStream = new FileInputStream(file);
+
+        if (inputStream == null)
+            inputStream = AssetAdapter.g.openFileAsStream(pathName);
+
         if (inputStream == null) {
-            //log.error("invalid bitmap source: " + src);
+            log.error("invalid resource: " + pathName);
             return null;
         }
 
diff --git a/vtm/src/org/oscim/theme/ExternalRenderTheme.java b/vtm/src/org/oscim/theme/ExternalRenderTheme.java
index 6c0d1931..5bb75baa 100644
--- a/vtm/src/org/oscim/theme/ExternalRenderTheme.java
+++ b/vtm/src/org/oscim/theme/ExternalRenderTheme.java
@@ -1,6 +1,7 @@
 /*
  * Copyright 2010, 2011, 2012 mapsforge.org
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -36,7 +37,7 @@ public class ExternalRenderTheme implements ThemeFile {
 
     /**
      * @param fileName the path to the XML render theme file.
-     * @throws FileNotFoundException if the file does not exist or cannot be read.
+     * @throws ThemeException if the file does not exist or cannot be read.
      */
     public ExternalRenderTheme(String fileName) {
 
@@ -74,6 +75,11 @@ public class ExternalRenderTheme implements ThemeFile {
         return true;
     }
 
+    @Override
+    public String getRelativePathPrefix() {
+        return new File(mPath).getParent();
+    }
+
     @Override
     public InputStream getRenderThemeAsStream() {
         InputStream is;
diff --git a/vtm/src/org/oscim/theme/ThemeFile.java b/vtm/src/org/oscim/theme/ThemeFile.java
index bbcfd830..1a13e6b2 100644
--- a/vtm/src/org/oscim/theme/ThemeFile.java
+++ b/vtm/src/org/oscim/theme/ThemeFile.java
@@ -1,6 +1,7 @@
 /*
  * Copyright 2010, 2011, 2012 mapsforge.org
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -22,6 +23,11 @@ import java.io.InputStream;
 import java.io.Serializable;
 
 public interface ThemeFile extends Serializable {
+    /**
+     * @return the prefix for all relative resource paths.
+     */
+    String getRelativePathPrefix();
+
     /**
      * @return an InputStream to read the render theme data from.
      * @throws FileNotFoundException if the render theme file cannot be found.
diff --git a/vtm/src/org/oscim/theme/ThemeLoader.java b/vtm/src/org/oscim/theme/ThemeLoader.java
index 5dce0557..eda78c28 100644
--- a/vtm/src/org/oscim/theme/ThemeLoader.java
+++ b/vtm/src/org/oscim/theme/ThemeLoader.java
@@ -1,5 +1,6 @@
 /*
  * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -14,7 +15,6 @@
  * 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.theme;
 
 import org.oscim.backend.CanvasAdapter;
@@ -44,7 +44,7 @@ public class ThemeLoader {
 
         try {
             InputStream is = theme.getRenderThemeAsStream();
-            return load(is);
+            return load(theme.getRelativePathPrefix(), is);
         } catch (FileNotFoundException e) {
             log.error(e.getMessage());
         }
@@ -53,9 +53,13 @@ public class ThemeLoader {
     }
 
     public static IRenderTheme load(InputStream inputStream) throws ThemeException {
+        return load("", inputStream);
+    }
+
+    public static IRenderTheme load(String relativePathPrefix, InputStream inputStream) throws ThemeException {
 
         try {
-            IRenderTheme t = XmlThemeBuilder.read(inputStream);
+            IRenderTheme t = XmlThemeBuilder.read(relativePathPrefix, inputStream);
             if (t != null)
                 t.scaleTextSize(CanvasAdapter.textScale + (CanvasAdapter.dpi / 240 - 1) * 0.5f);
             return t;
diff --git a/vtm/src/org/oscim/theme/XmlThemeBuilder.java b/vtm/src/org/oscim/theme/XmlThemeBuilder.java
index 82d14c2e..f76570be 100644
--- a/vtm/src/org/oscim/theme/XmlThemeBuilder.java
+++ b/vtm/src/org/oscim/theme/XmlThemeBuilder.java
@@ -80,16 +80,17 @@ public class XmlThemeBuilder extends DefaultHandler {
     private static final String AREA_STYLE = "A";
 
     /**
-     * @param inputStream an input stream containing valid render theme XML data.
+     * @param relativePathPrefix the prefix for all relative resource paths.
+     * @param inputStream        an input stream containing valid render theme XML data.
      * @return a new RenderTheme which is created by parsing the XML data from
      * the input stream.
      * @throws ThemeException if an error occurs while parsing the render theme XML.
      * @throws IOException    if an I/O error occurs while reading from the input stream.
      */
-    public static IRenderTheme read(InputStream inputStream)
+    public static IRenderTheme read(String relativePathPrefix, InputStream inputStream)
             throws ThemeException {
 
-        XmlThemeBuilder renderThemeHandler = new XmlThemeBuilder();
+        XmlThemeBuilder renderThemeHandler = new XmlThemeBuilder(relativePathPrefix);
 
         try {
             new XMLReaderAdapter().parse(renderThemeHandler, inputStream);
@@ -134,8 +135,13 @@ public class XmlThemeBuilder extends DefaultHandler {
     private int mMapBackground = 0xffffffff;
     private float mTextScale = 1;
 
+    private final String mRelativePathPrefix;
     private RenderTheme mRenderTheme;
 
+    public XmlThemeBuilder(String relativePathPrefix) {
+        mRelativePathPrefix = relativePathPrefix;
+    }
+
     @Override
     public void endDocument() {
 
@@ -522,7 +528,7 @@ public class XmlThemeBuilder extends DefaultHandler {
 
         if (src != null) {
             try {
-                Bitmap bitmap = CanvasAdapter.getBitmapAsset(src);
+                Bitmap bitmap = CanvasAdapter.getBitmapAsset(mRelativePathPrefix, src);
                 if (bitmap != null)
                     b.texture = new TextureItem(bitmap, true);
             } catch (Exception e) {
@@ -557,11 +563,15 @@ public class XmlThemeBuilder extends DefaultHandler {
         }
         validateExists("img", img, elementName);
 
-        Bitmap bitmap = CanvasAdapter.getBitmapAsset(img);
-        mTextureAtlas = new TextureAtlas(bitmap);
+        Bitmap bitmap = CanvasAdapter.getBitmapAsset(mRelativePathPrefix, img);
+        if (bitmap != null)
+            mTextureAtlas = new TextureAtlas(bitmap);
     }
 
     private void createTextureRegion(String elementName, Attributes attributes) {
+        if (mTextureAtlas == null)
+            return;
+
         String regionName = null;
         Rect r = null;
 
@@ -829,7 +839,7 @@ public class XmlThemeBuilder extends DefaultHandler {
 
         if (src.toLowerCase(Locale.ENGLISH).endsWith(".png")) {
             try {
-                Bitmap bitmap = CanvasAdapter.getBitmapAsset(src);
+                Bitmap bitmap = CanvasAdapter.getBitmapAsset(mRelativePathPrefix, src);
                 if (bitmap != null)
                     return new SymbolStyle(bitmap);
             } catch (Exception e) {