This file is indexed.

/usr/share/osgearth/maps/nodata.earth is in osgearth-data 2.4.0+dfsg-6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!-- 
osgEarth Sample - GDAL Driver NoData
Demonstrates the use of a file with nodata.  The white circle is a GeoTiff which has 0 marked as NoData so the black borders in the original imagery should show up as transparent.
-->

<map version="2">
    <image driver="gdal" name="world-tiff" cache_enabled="false">
        <url>/usr/share/osgearth/data/world.tif</url>
        <caching_policy usage="no_cache"/>
    </image>
	
	<image driver="gdal" name="nodata-tiff" cache_enabled="false">
        <url>/usr/share/osgearth/data/nodata.tif</url>
        <caching_policy usage="no_cache"/>
    </image>
    
    <options lighting="false"/>
</map>