In GRASS GIS, you can set the resolution of the raster output (on the Region tab) just like for any SEXTANTE module with raster output. This is also true for v.to.rast. You can set it to as fine a resolution as you like.
I guess you can also use the Raster Calculator's if() function to replace the "no data" value with "0" (or whatever you prefer). E.g. a possible algebra expression would be: if(map==-99999,0,map) (Replace "map" with the name of your actual input layer). Ben ----- Original Message ----- > Thanks Ben ! We prefer Sextante over all. But we try to use Grass, > which yields horrible low-resolution results which can't be used. We > also want to further process the results of the "density.kernel" and > the "rasterize vector layer" with the raster calculator. So, I guess > it is preferable that we use Sextante tools only for each step. Isn't > there an internal work around for the no data value issue ? > j > > > > > > > 2011/7/11 Benjamin Ducke < benjamin.du...@oxfordarch.co.uk > > > > Yes indeed, this algorithm uses a fixed "no data" value > of "-99999", instead of honoring the SEXTANTE setting. > I will file a bug ticket. Should be a quick fix. > > Maybe use GRASS' v.to.rast until the problem is fixed? > > Ben > > > > > ----- Original Message ----- > > This seems to be a bug for which we need a workaround. > > > > We create a raster from a vector layer using sextante "rasterize > > vector layer". The result looks good. We then close the file and > > re-open it, so that it obtains its real name and can be used by > > "raster calculator". When we reopen the file, the value for no data > > is set to "99999.0". We tried different things, setting custom value > > "0" etc. To no avail. On the other hand, when we create a raster > > using the > > "density.kernel", there has never been an issue with the no data > > value, which is and remains set to "0". > > > > Please, please give us the secret about how to make and keep the no > > data value "0" when using "rasterize vector layers" ! > > > > Joachim > > _______________________________________________ Sextante-users > > mailing list Sextante-users@lists.forge.osor.eu > > https://lists.forge.osor.eu/listinfo/sextante-users > > > ------ Files attached to this email may be in ISO 26300 format (OASIS > Open Document Format). If you have difficulty opening them, please > visit http://iso26300.info for more information. > > _______________________________________________ Sextante-users mailing > list Sextante-users@lists.forge.osor.eu > https://lists.forge.osor.eu/listinfo/sextante-users > > > _______________________________________________ Sextante-users mailing > list Sextante-users@lists.forge.osor.eu > https://lists.forge.osor.eu/listinfo/sextante-users ------ Files attached to this email may be in ISO 26300 format (OASIS Open Document Format). If you have difficulty opening them, please visit http://iso26300.info for more information. _______________________________________________ Sextante-users mailing list Sextante-users@lists.forge.osor.eu https://lists.forge.osor.eu/listinfo/sextante-users
