LP-29 added osgearth resources

ground/gcs/src/share/osgearth/arcgis.earth

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+<!-- osgEarth Configuration -->
+
+<map name="ArcGIS World Imagery" type="geocentric" version="2">
+
+    <options>
+        <!--overlay_resolution_ratio="1.0"/-->
+        <terrain first_lod="0" />
+        <!--terrain first_lod="0" min_lod="20" /-->
+    </options>
+
+    <image name="arcgis-world-imagery" driver="arcgis">
+        <transparent_color>255 255 255 1</transparent_color>
+        <url>http://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer</url>
+        <nodata_image>http://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/100/0/0.jpeg</nodata_image>
+    </image>
+
+    <elevation name="ReadyMap.org - Elevation" driver="tms">
+        <url>http://readymap.org/readymap/tiles/1.0.0/9/</url>
+    </elevation>
+
+</map>

ground/gcs/src/share/osgearth/readymap.earth

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+<!--
+osgEarth Sample - ReadyMap.ORG Server - http://readymap.org
+
+ReadyMap.ORG provides free global base map data for osgEarth developers!
+This tiled, worldwide dataset of imagery, elevation, and street map data
+is a great base map that provides global context for your own local datasets.
+It works "out of the box" with osgEarth applications.
+
+**** NOTICE ****
+YOU ARE RESPONSIBLE for abiding by the TERMS AND CONDITIONS outlined at: http://readymap.org
+-->
+<map name="readymap.org" type="geocentric">
+
+    <options>
+        <!--overlay_resolution_ratio="1.0"/-->
+        <terrain first_lod="0" min_lod="20" />
+    </options>
+
+    <image name="readymap_imagery" driver="tms">
+        <url>http://readymap.org/readymap/tiles/1.0.0/7/</url>
+    </image>
+
+    <elevation name="readymap_elevation" driver="tms">
+        <url>http://readymap.org/readymap/tiles/1.0.0/9/</url>
+    </elevation>
+
+ </map>