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

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 - 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" version="2">

    <image name="ReadyMap.org - Imagery" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/7/</url>
    </image>

    <image name="ReadyMap.org - Street Map" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/35/</url>
    </image>
        
    <elevation name="ReadyMap.org - Elevation" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/9/</url>
    </elevation>
    
    <options>
        <terrain>
            <lighting>true</lighting>
        </terrain>
    </options>
    
    <external>
        <sky/>
        
        <!-- Ocean parameters. -->
        <ocean>
        
            <!-- Surface texture to use -->
            <texture_url>/usr/share/osgearth/data/watersurface1.png</texture_url>
            
            <!-- Masking layer to use (optional...without a masking layer, osgEarth will sample the
                 terrain elevation data to determine where the ocean is.
            <mask_layer driver="tms">
                <url>http://readymap.org/readymap/tiles/1.0.0/2/</url>
            </mask_layer>
            -->
            
            <!-- surface color (before texturing) -->
            <base_color>#334f7fbf</base_color>
        </ocean>
        
        <viewpoint name="Los Angeles" heading="35.27" height="97.48" lat="34.051" long="-117.974" pitch="-17" range="136405"/>
        <viewpoint name="Above water" heading="-76.17264538992794" height="-199.5569639196619" lat="33.27975381179682" long="-118.3307776586542" pitch="-10.06523772274543" range="3739.161570538204"/>
        <viewpoint name="Below water" heading="-24.96310172368127" height="-1300.000076910481" lat="33.27360337088133" long="-118.5514448058582" pitch="-10.0770016631354" range="6375.084038302656"/>
    </external>
</map>