Hi Nikos and Luis<div>Thanks for your replies</div><div>I still have a few issues regarding this:</div><div>1- How can a region not to be a Square? If I have to set North/South/East/West boundaries?</div><div>2- In my case, my mask is a Vectorial. Can I use a vectorial as a mask?</div>
<div><br></div><div>Thank you once again<br><br><div class="gmail_quote">No dia 17 de Maio de 2010 23:44, Nikos Alexandris <span dir="ltr"><<a href="mailto:nikos.alexandris@felis.uni-freiburg.de">nikos.alexandris@felis.uni-freiburg.de</a>></span> escreveu:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Luisa Peña:<br>
<div class="im">> > 1- Should I create 1 Location with 4 different mapsets (for each of<br>
> > the considered scales)? Or should I use 1 location, one mapset and 4<br>
> > different regions?<br>
<br>
</div><div class="im">Luís Ferreira wrote:<br>
> one location if all the analysis will be done with one coordinate system<br>
> one mapset = one region, one resolution<br>
<br>
</div>Of course you can work with material of different geospatial extent/resolution<br>
on the same mapset. It's just that you have to pay attention when it comes to<br>
raster computations.<br>
<br>
Note also that most vector modules are _not_ limited by the extent/resolution<br>
of the _computational_ region.<br>
<div class="im"><br>
> so, perhaps, is better you to use four different mapsets (four levels)<br>
<br>
</div>I would think of using several map sets based on "what" is the question to be<br>
answered. Something like a thematic sorting. For example an ndvi mapset.<br>
Combine your "questions to be answered" with your "scale" levels (if you want<br>
to _not_ think all the time about the extent and the resolution) and you could<br>
go for, let's say "ndvi_local" , "ndvi_national", "indexA_local",<br>
"indexA_national", etc.<br>
<br>
Finally an export mapset could be useful to drag-in all the maps you want to<br>
export (at a single step using some script for example?).<br>
<div class="im"><br>
> > 2- How can I define a region that is not a perfect square' Because in<br>
> > "Set Region" we have North, South, East and West Boundaries. And my<br>
> > regions are not perfect squares.<br>
<br>
> A region don't need to be square. And you can use an analysis mask.<br>
> Raster > Mask, or r.mask.<br>
<br>
</div>Or "r.mapcalc". I remember at least one occasion where "r.mask" did not work<br>
as expected. Don't know if this has been fixed.<br>
<br>
Note that there might be some modules that ignore the MASK!<br>
<br>
Cheers, Nikos<br>
</blockquote></div><br></div>