Xunlei,<br><br>GetMetaData() returns a string list. Each string will contain a metadata item. You can read the documentation for handling string list at <a href="http://www.gdal.org/cpl__string_8h.html">http://www.gdal.org/cpl__string_8h.html</a><br>
<br>If you happen to know the name of the metadata item, you can use GetMetaDataItem().<br>Ex: GetMetaDataItem("GRIB_SHORT_NAME") may return a string "100000-ISBL".<br><br>I think most of your other queries will be resolved when you can read the metadata.<br>
<br><div class="gmail_quote">On Mon, Mar 14, 2011 at 11:37 PM, Xunlei Wu <span dir="ltr"><<a href="mailto:xunlei@renci.org">xunlei@renci.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal">Hi All,</p><p class="MsoNormal">I am a novice user of GDAL. I am using GDAL to decode GRIB and GRIB2 files. I followed</p><p class="MsoNormal"> <a href="http://www.gdal.org/gdal_tutorial.html" target="_blank">http://www.gdal.org/gdal_tutorial.html</a> and <a href="http://www.gdal.org/gdal_datamodel.html" target="_blank">http://www.gdal.org/gdal_datamodel.html</a>. However, I still have trouble accessing metadata from a GDALRasterBand object and GDALDataset object. For instance, how do I know the count of Metadata items in the return value of GDALMajorObject::GetMetadata()? I was not sure what to put in as “pszName” in GDALMajorObject::GetMEtadataItem(). And is it the right way to retrieve attributes of a GRIB data file? I know a GRIB file contains at least moisture and pressure at each grid point. I have no idea how to GDAL to identify which GDALRasterBand in GDALDataset and their units for instance. Is there a way to tell the elevation of a particular GDALRasterBand?</p>
<p class="MsoNormal">Thanks a lot for your help.</p><p class="MsoNormal"> </p><p class="MsoNormal">Best,</p><p class="MsoNormal">8gpus</p></div></div><br>_______________________________________________<br>
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