<DIV>I download a elevation data (SRTM,GTOPO30) from <A href="http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp">http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp</A></DIV>
<DIV> </DIV>
<DIV> use </DIV>
<DIV>gdal_translate -b 1 -of PNG -ot Byte source.tif des.png</DIV>
<DIV>and </DIV>
<DIV>gdal_translate -b 1 -of PNG -ot UInt16 source.tif des.png</DIV>
<DIV>differently,</DIV>
<DIV>with parameter 'UInt16',I get a black picture,with Byte,get a different one,why?</DIV>
<DIV>BTW,I want to get a png file from elevation data(.tif),must I use command gdal_translate?</DIV>
<DIV>Thk u in advance.</DIV>
<DIV> </DIV>
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