<!--
osgEarth Sample

WorldWind Elevation example

This example shows how to use the NASA WorldWind elevation reader mixed with ArcGIS imagery
-->

<map name="WorldWind Elevation" type="geocentric" version="2">
   
    <image name="arcgisonline esri imagery" driver="arcgis">
        <url>http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer</url>
        <nodata_image>http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer/tile/100/0/0.jpeg</nodata_image>
    </image>
       
    <heightfield name="WorldWind bil" driver="worldwind">
	  <!-- Specify where to download SRTM zip files to and store the resuling .bil files -->
      <worldwind_cache>worldwind_SRTM</worldwind_cache>
    </heightfield>
		
    <options>
        <terrain>
            <vertical_scale>2</vertical_scale>
            <sample_ratio>0.25</sample_ratio>    
        </terrain>
    </options>
</map> 