Hi Nikos and Luis Thanks for your replies I still have a few issues regarding this: 1- How can a region not to be a Square? If I have to set North/South/East/West boundaries? 2- In my case, my mask is a Vectorial. Can I use a vectorial as a mask?
Thank you once again No dia 17 de Maio de 2010 23:44, Nikos Alexandris < [email protected]> escreveu: > Luisa Peña: > > > 1- Should I create 1 Location with 4 different mapsets (for each of > > > the considered scales)? Or should I use 1 location, one mapset and 4 > > > different regions? > > Luís Ferreira wrote: > > one location if all the analysis will be done with one coordinate system > > one mapset = one region, one resolution > > Of course you can work with material of different geospatial > extent/resolution > on the same mapset. It's just that you have to pay attention when it comes > to > raster computations. > > Note also that most vector modules are _not_ limited by the > extent/resolution > of the _computational_ region. > > > so, perhaps, is better you to use four different mapsets (four levels) > > I would think of using several map sets based on "what" is the question to > be > answered. Something like a thematic sorting. For example an ndvi mapset. > Combine your "questions to be answered" with your "scale" levels (if you > want > to _not_ think all the time about the extent and the resolution) and you > could > go for, let's say "ndvi_local" , "ndvi_national", "indexA_local", > "indexA_national", etc. > > Finally an export mapset could be useful to drag-in all the maps you want > to > export (at a single step using some script for example?). > > > > 2- How can I define a region that is not a perfect square' Because in > > > "Set Region" we have North, South, East and West Boundaries. And my > > > regions are not perfect squares. > > > A region don't need to be square. And you can use an analysis mask. > > Raster > Mask, or r.mask. > > Or "r.mapcalc". I remember at least one occasion where "r.mask" did not > work > as expected. Don't know if this has been fixed. > > Note that there might be some modules that ignore the MASK! > > Cheers, Nikos >
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
