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