[gdal-dev] getting height from Geotiff DEM

[djawahar]

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



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