Usually DEM are not unsigned 8 bit but if you are asking for GDT_Byte, that is what you will get.
You should change that RasterIO() parameter to GDT_Float32 for example. > Date: Sat, 6 Jun 2015 01:31:59 -0700 > From: jawaha...@hotmail.com > To: gdal-dev@lists.osgeo.org > Subject: [gdal-dev] getting height from Geotiff DEM > > Hi, > I have a geotiff dem. How can I get the height information given a pixel > coordinate? I tried to get the data using > gdErr = poDataset->GetRasterBand(1)->RasterIO( > GF_Read, 0, 0, poDataset->GetRasterXSize(), > poDataset->GetRasterYSize(), > pBits, bmi.Header.biWidth, bmi.Header.biHeight, > GDT_Byte, > 1, nScanSize); > > but the data is either 0 or 255. > > What is the right way to do this? > > Thanks & regards, > > D. Jawahar > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/getting-height-from-Geotiff-DEM-tp5209506.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev
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