On Sun, Jan 3, 2016 at 11:55 PM, Ken Mankoff <[email protected]> wrote: > > On 2016-01-03 at 15:46, Anna Petrášová <[email protected]> wrote: >> I don't have any experience with r.terraflow, but try using >> r.watershed. > > Crashes with different errors. I'll post about that later. I was using > terraflow because it claims to be for large data (not that I think this data > is particularly large...)
r.watershed deals quite well with large datasets, too.See https://grasswiki.osgeo.org/wiki/GRASS_GIS_Performance#Large_raster_data_processing (r.watershed on a 90k x 100k pixels raster map) > r.mapcalc 'phi = bed*2' does produce a data file, full resolution or > downsampled. > > Oddly, "2*bed" works, but "2.5*bed" does not work. That's rather unusual, indeed. > Does r.mapcalc only do integer math? Definitely yes. > Not according to the manual. Oh - so we should improve that: https://grass.osgeo.org/grass70/manuals/r.mapcalc.html Please let us know where to add extra explanations (what did you look for and didn't find?) > "r.info bed" shows the range is -5028 to 3678. Please note that if "bed" is an integer map, r.mapcalc will generate integer from "bed * number". You would need to write 2.5 * bed or 1.0 * bed * 2 to get floating point results. Should we expand this section? https://grass.osgeo.org/grass70/manuals/r.mapcalc.html#floating-point-values-in-the-expression Markus _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
