weixj2003ld,<br><br>DEM = Digital Elevation Model<br><br>.img = Irdas Imagine Format<br><br>DEM can be represented in most raster formats.<br>Refer to <a href="http://en.wikipedia.org/wiki/Digital_elevation_model">http://en.wikipedia.org/wiki/Digital_elevation_model</a><br>
<br>2. There is only one band because there is only the elevation data to store. The colour table takes care of the colours.<br><br><div class="gmail_quote">2010/4/7 weixj2003ld <span dir="ltr"><<a href="mailto:weixj2003ld@163.com">weixj2003ld@163.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>1.I use GDAL to read a DEM file,and its extension is .img ,what other extensions for DEM file?</div>
<div>2.When I reand a geotff file and a dem file,I find that the dfference between them as follows:</div>
<div> <font color="#880000"> </font><font color="#ff0000"> geotiff: Dem</font></div>
<div> GetDriver()->GetDescription() : GTiff, HFA</div>
<div> GetDriver()->GetMetadatItem(GDAL_DMD_LONGNAME): GeoTIFF Drdas Imagine Images(.img)</div>
<div> bandnumber 6 1</div>
<div> </div>
<div>Now,I want to know that,the bandnumber of DEM file is always 1?</div><br><br><span title="neteasefooter"></span><br>_______________________________________________<br>
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