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/usr/share/osgearth/maps/feature_multilod.earth is in osgearth-data 2.5.0+dfsg-2.

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The actual contents of the file can be viewed below.

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<!--
osgEarth Sample
Shows how to create a multi-LOD setup for GPU-clamped geometry.
-->

<map name="Geometry Rasterizer Demo" type="round" version="2">
  
    <image name="readymap_imagery" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/7/</url>
        <color_filters>
            <gamma rgb="1.3"/>
        </color_filters>
    </image>
        
    <elevation name="readymap_elevation" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/9/</url>
    </elevation>
    
    <options lighting="false">
      <terrain normalize_edges="true"/>
    </options>
    
    
    <model name="roads" driver="feature_geom" lighting="false">

        <features name="roads" driver="ogr">
            <url>/usr/share/osgearth/data/istates_dissolve.shp</url>
            <ogr_driver>ESRI Shapefile</ogr_driver>
            <build_spatial_index>true</build_spatial_index>
        </features>

        <layout crop_features="true">
            <level style="lo"  min_range="250000"/>
            <level style="mid" max_range="350000" min_range="25000"/>
            <level style="hi"  max_range="75000"/>
        </layout>
        
        <styles>
            <style type="text/css">
                lo {
                    stroke:              #ffff009f;
                    stroke-width:        2;
                    altitude-clamping:   terrain-gpu;
                }           
                mid {
                    stroke:              #ffff009f;
                    stroke-width:        3;
                    altitude-clamping:   terrain-gpu;
                }                
                hi {
                    stroke:              #ffff009f;
                    stroke-width:        125m;
                    stroke-tessellation: 5;
                    altitude-clamping:   terrain-gpu;
                    render-depth-offset-min-bias: 20;
                }        
            </style>
        </styles>
        
    </model>
  
</map>