[gdal-dev] Unexpected results with GDALDEM

[Even Rouault]

Le mardi 09 juillet 2013 23:30:19, William Hudspeth, Ph.D. a écrit :
> Hello all,
> 
> I am using gdaldem that came with the GDAL 1.7.3 version on Ubuntu
> 12.04. I am trying to create slope maps with a command something like this:
> 
> gdaldem slope -s scale=111120 source_DEM.tif target_SLOPE.tif

An error is "-s scale=111120" (which is interpreted as "-s 0"). It must be 
just "-s 111120"

I've just added a validation check in the code so that it would now be 
reported as an error if you use the wrong syntax.

> 
> the source DEM geotiff was created with gdalwarp, re-projecting a
> National Elevation Dataset 30 meter, ESRIHdr formatted grid from
> geographic-NAD83 to geographic-WGS84. Based on a thread I found on use
> of 'gdaldem slope' on the web, the re-projection was attempted with both
> a bilinear and cubic re-sampling method.
> 
> The target geotiff has values of only 90 and Null. I am getting no
> intermediate values (in degrees, the default).
> 
> Thanks for any help in advance,
> 
> Bill
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