Oops, > > Recommended reading: > http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html > here the first part explaining the computational region > > and the g.region manual > http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html
http://grass.osgeo.org/grass64/manuals/html64_user/g.region.html of course > > HTH, > > Markus > >> >> Thanks for the help. >> >> Kurt >> On May 24, 2010, at 4:37 AM, Markus Metz wrote: >> >>> On Sun, May 23, 2010 at 8:10 PM, Kurt Springs <[email protected]> wrote: >>>> Problem was the resolution it starts working when I set it to 100m. The >>>> dem >>>> is ~69 x 27 km. >>> >>> Apparently, the dem has a resolution of 1/3 arcsec (~10m), maybe >>> reprojected and resampled. With these extends, there would be about >>> 186 million cells in the input map which is not a lot. I have >>> successfully processed regions with ~250 million cells in memory and >>> ~500 million cells in segmented mode. Make sure the current >>> computational region matches the resolution of the input dem and the >>> extends of the current computational region do not exceed the extends >>> of the input map. Setting the computational region to a smaller area >>> within the dem coverage is fine, as long as g.region -p align=NED13_01 >>> is used after adjusting the extends. A resolution of 100m throws away >>> a lot of the information present in the original dem. >>> >>> >>>> Thanks >>>> On May 23, 2010, at 12:00 PM, Rich Shepard wrote: >>>> >>>> On Sat, 22 May 2010, Kurt Springs wrote: >>>> >>>> ERROR: G_malloc: unable to allocate 18446744070980740804 bytes at ... >>>> >>>> ^^^^^^^^^^^^^^^^^^^^ >>>> >>>> Any idea what I'm doing wrong? >>>> >>>> Kurt, >>>> >>>> Look at the amount of memory your file wants to be allocated: several >>>> Petabytes. How much area is covered by that DEM and at what resolution? >>>> Even >>>> with GRASS compiled for large file support your file is _way_ too large. >>>> >>>> Rich >>>> >>>> _______________________________________________ >>>> grass-user mailing list >>>> [email protected] >>>> http://lists.osgeo.org/mailman/listinfo/grass-user >>>> >>>> >> >> > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
