Re: [GRASS-user] v.generalize and where clause

On Sun, Apr 21, 2019 at 11:16 AM Micha Silver wrote: > > > > On 21/04/2019 0:42, Markus Metz wrote: > > > > > Am I missing something? > > Yes, the option layer defaults to -1 = all layers. If you use the cats or where option, you need to specify a layer, otherwise the warning > WARNING: No layer s

Re: [GRASS-user] Nice opportunity to show off GRASS functionality and topological vector format ?

On Thu, Apr 18, 2019 at 6:38 PM Markus Metz wrote: > > > > On Tue, Apr 16, 2019 at 11:07 AM Moritz Lennert < mlenn...@club.worldonline.be> wrote: > > > > Hi, > > > > If anyone has some time and wants to show off some GRASS GIS power: > > > > https://www.ecmwf.int/en/learning/workshops/ecmwf-summer

[GRASS-user] estimate impervious areas from satellite imagery

Hi, is it possible to process satellite imagery, even if just google satellite, and estimate percentage of impervious (hard surfaces such as paved and roof) areas. this would useful for estimating infiltration and runoff from a watershed. thanks f. ___

[GRASS-user] How to digitize a donut polygon/area?

Hi list, I tried to digitize a polygon/area with a hole in it with no sucsses. Could nyone from list tell me how to do that. Regads Amit ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] v.generalize and where clause

On 21/04/2019 0:42, Markus Metz wrote: > > Am I missing something? Yes, the option layer defaults to -1 = all layers. If you use the cats or where option, you need to specify a layer, otherwise the warning WARNING: N