[Gdal-dev] gdal_contour missing contours!

[Jeshua Lacock]

On Jan 7, 2006, at 9:24 AM, Frank Warmerdam wrote:

> mydem.tif isn't a DEM, it's a colored encoding of a DEM
> in RGB.   You need to generate the DEM against the
> original DEM data.
>
> warmerda at gdal2200[6]% gdalinfo -mm mydem.tif
> Driver: GTiff/GeoTIFF
> Size is 339, 467
> Coordinate System is `'
> Corner Coordinates:
> Upper Left  (    0.0,    0.0)
> Lower Left  (    0.0,  467.0)
> Upper Right (  339.0,    0.0)
> Lower Right (  339.0,  467.0)
> Center      (  169.5,  233.5)
> Band 1 Block=339x8 Type=Byte, ColorInterp=Red
>     Computed Min/Max=0.000,255.000
> Band 2 Block=339x8 Type=Byte, ColorInterp=Green
>     Computed Min/Max=0.000,255.000
> Band 3 Block=339x8 Type=Byte, ColorInterp=Blue
>     Computed Min/Max=0.000,255.000

Doh!

Of course, I was starting to suspect that myself.

Can you recommend a method of exporting a DEM from GRASS?



Thanks again,

Jeshua Lacock ___________________________
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