[gdal-dev] getting height from Geotiff DEM

[Nicolas Cadieux]

Hi,

There is the " value tool plugin" that you can install.  That will give you the values when you move your mouse across  the raster. For more points, install the "point sampling tool" plugin.

Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca

On Jun 6, 2015 4:31 AM, djawahar <jawahar_d at hotmail.com> wrote:
>
> 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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