/usr/share/osgearth/maps/datum_override.earth is in osgearth-data 2.4.0+dfsg-6.
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osgEarth Sample
This example demonstrates how to set a particular datum for a geocentric map.
By default, a geocentric map will use a WGS84 datum. Use the "profile" tag
to specify a different one is so desired. The contents of the "srs" tag can be
any SRS initialization string (like PROJ4 or WKT).
This example renders a NAD27 globe instead of a WGS84 globe.
See this site for SRS codes and PROJ4 initialization strings:
http://spatialreference.org
-->
<map name="datum override example" type="geocentric" version="2">
<options>
<lighting>false</lighting>
<profile srs="+proj=longlat +ellps=clrk66 +datum=NAD27 +no_defs"/>
</options>
<image name="pelican nasa blue marble" driver="tms">
<url>http://demo.pelicanmapping.com/rmweb/data/bluemarble-tms/tms.xml</url>
</image>
</map>
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