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WCS (OGC Web Coverage Service)
==============================
This plugin reads raster coverage data in a limited fashion based on the
OGC `Web Coverage Service`_ specification. In osgEarth it is only really useful
for fetching elevation grid data tiles. We support a subset of WCS 1.1.
Example usage::
<elevation driver="wcs">
<url>http://server</url>
<identifier>elevation</identifier>
<format>image/GeoTIFF<format>
</elevation>
Properties:
:url: Location of the WCS resource
:identifier: WCS identifier (i.e., layer to read)
:format: Format of the data to return (usually ``tif``)
:elevation_unit: Unit to use when interpreting elevation grid height values (defaults to ``m``)
:range_subset: WCS range subset string (see the WCS docs)
.. _Web Coverage Service: http://en.wikipedia.org/wiki/Web_Coverage_Service
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