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,<html><head><title>WCS -- OGC Web Coverage Service</title></head><body bgcolor="#ffffff"><h1>WCS -- OGC Web Coverage Service</h1>The optional GDAL WCS driver allows use of a coverage in a WCS server as a raster dataset. GDAL acts as a client to the WCS server.<p>Accessing a WCS server is accomplished by creating a local service descriptionxml file looking something like the following, with the coverage server url, and the name of the coverage to access. It is important that there be nospaces or other content before the <tt><WCS_GDAL></tt> element.<p><pre><WCS_GDAL> <ServiceURL>http://maps.gdal.org/cgi-bin/mapserv_dem?</ServiceURL> <CoverageName>srtmplus_raw</CoverageName></WCS_GDAL></pre>When first opened, GDAL will fetch the coverage description, and a small testimage to establish details about the raster. This information will be cachedin the service description file to make future opens faster - no server accessshould be required till imagery is read for future opens.<p>The WCS driver should support WCS 1.0.0 servers. It is planned to add WCS 1.1.0 support soon, but WCS 0.7 servers are not supported. Any returnformat that is a single file, and is in a format supported by GDAL shouldwork. The driver will prefer a format with "tiff" in the name, otherwiseit will fallback to the first offered format. Coordinate systems are readfrom the DescribeCoverage result, and are expected to be in the form of <tt>EPSG:n</tt> in the <tt>>supportedCRSs<</tt> element. <p>The service description file has the following additional elements as immediate children of the <tt>WCS_GDAL</tt> element that may be optionallyset.<p><ul><li> <b>PreferredFormat</b>: the format to use for GetCoverage calls.<p><li> <b>BandCount</b>: Number of bands in the dataset, normally captured from the sample request. <li> <b>BandType</b>: The pixel data type to use. Normally established from the sample request.<li> <b>BlockXSize</b>: The block width to use for block cached remote access.<li> <b>BlockYSize</b>: The block height to use for block cached remote access.<li> <b>NoDataValue</b>: The nodata value to use for all the bands (blank for none). Normally defaulted from CoverageOffering info.<li> <b>Timeout</b>: The timeout to use for remote service requests. If not provided, the libcurl default is used.<li> <b>OverviewCount</b>: The number of overviews to represent bands as having. Defaults to a number such that the top overview is fairly smaller (less than 1K x 1K or so).b</ul>See Also:<p><ul><li> <a href="http://www.opengeospatial.org/standards/wcs">OGC WCS Standards</a></ul></body></html>⌨️ 快捷键说明
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