weixj2003ld,<br><br>Did you try a different Y offset? May be the data really is zero in the first line.<br>Please give the output of gdalinfo with this file.<br><br><div class="gmail_quote">On Sat, Apr 3, 2010 at 4:13 PM, weixj2003ld <span dir="ltr"><<a href="mailto:weixj2003ld@163.com">weixj2003ld@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>Thk u for your reply.</div>
<div>Yes,it is Erdas imagine format.</div>
<div>I use the following code to read the data of it,but I find that the value of it is always 0,I do not know why.</div>
<div> </div>
<div> </div>
<div> float *pafScanline;<br> int nXSize=poBand->GetXSize();<br> pafScanline=(float *)CPLMalloc(sizeof(float)*nXSize);<br> poBand->RasterIO(GF_Read,0,0,nXSize,1,pafScanline,nXSize,1,GDT_Float32,0,0);<br><br></div>
<div>Wei</div><div><div></div><div class="h5">
<div> </div>
<div> <br></div>
<div> </div>
<div><br>The file you have is probably in Erdas Imagine format.<br>Try the command "gdalinfo -stats <dem_file.img>". This will show if you can open it with GDAL.<br><br>If you want to know how to read the data, refer to <a href="http://www.gdal.org/gdal_tutorial.html" target="_blank">http://www.gdal.org/gdal_tutorial.html</a><br>
<br></div>
<blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">
<div class="gmail_quote">2010/4/3 weixj2003ld <span dir="ltr"><<a href="mailto:weixj2003ld@163.com" target="_blank">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>Hi,</div>
<div>Now I have a dem file (.img),I want to read it with gdal,how to do?I find that gdal only read ascii dem,what is means?</div>
<div>Thk u in advance.</div><br><br><span title="neteasefooter"></span><br>_______________________________________________<br>gdal-dev mailing list<br><a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a><br>
<a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>
/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9848167848<br>17.2416N 80.1426E<br></blockquote><br><br><span title="neteasefooter"></span></div></div></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>
/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9848167848<br>17.2416N 80.1426E<br>