On 06/15/2010 08:17 AM, Edgar Pimiento wrote:
Hello all,
Welcome:
I am a new GRASS 6.4 user (1 month). I want to calculate topograhic
parameters (profile and tangential curvatures) from a 1-m DEM that has
negative XY coordinates (EPSG2446) north -210,000 south -213,000 west
-60,500 east -55,500. Resulting rasters have extremely large values.
SO your region is 3 km X 5 km, or 3000 m X 5000 m (I'll assume you have
the region resolution set to 1 m?? Check this with g.region -p)
In this case you'll be working with a raster of 15,000,000 cells. It's a
large region by not unreasonable size. With any recent computer you
should be able to do profiles and curvature.
What are the values that you say are extremely large??
Is it because of spatial reference? is there a workaournd?
I appreciate any comment. Thank you,
Edgar Pimiento Chamorro
e_pimie...@yahoo.com
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http://surfaces.co.il
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