/usr/share/osgearth/maps/layer_opacity.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 : Layer Opacity
This example tests setting a layers initial opacity in the .earth file.
The opacity will only take affect when using a technique that can blend layers together such as the multipass layering technique or the osgEarthUtil::FadeLayerNode
Look for hi-res insets over the cities of Boston and New York.
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<map name="hi-res inset" type="geocentric" version="2">
<options>
<lighting>false</lighting>
</options>
<image name="pelican nasa blue marble" driver="tms">
<url>http://demo.pelicanmapping.com/rmweb/data/bluemarble-tms/tms.xml</url>
</image>
<image name="boston_inset" driver="gdal" opacity="0.3">
<url>/usr/share/osgearth/data/boston-inset-wgs84.tif</url>
</image>
</map>
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