Re: [GRASS-user] Converting raster to polygon creates too many polygons

2010-09-29 Thread Markus Metz
Hanlie Pretorius wrote: > > I don't really know why the > resolution in the x and y directions are not the same. Even when I set > them explicitly, I get a slight difference: The -a flag is missing, see my previous post. > - > g.region -p vect=c83a_bor...@permanent nsres=25 ewres=25 > projecti

Re: [GRASS-user] Converting raster to polygon creates too many polygons

2010-09-29 Thread Hanlie Pretorius
2010/9/29, Markus Metz : > > In GRASS, you have full control of the computational region, > consequently you must be able to explain (to the client/supervisor) > every aspect of the computational region. Why is the horizontal > resolution not only slightly off from exactly one meter, but also > dif

Re: [GRASS-user] Converting raster to polygon creates too many polygons

2010-09-29 Thread Markus Metz
Hanlie Pretoriuswrote: > Hi, > > I've created subcatchments using r.watershed and I would like to > convert these to polygons. My result at the moment contains too many > polygons - 194. The original raster had only 9 areas, which should all > have been contiguous seeing that they came from r.water

Re: [GRASS-user] Converting raster to polygon creates too many polygons

2010-09-29 Thread Micha Silver
On 09/29/2010 02:11 PM, Hanlie Pretorius wrote: Hi, I've created subcatchments using r.watershed and I would like to convert these to polygons. My result at the moment contains too many polygons - 194. The original raster had only 9 areas, which should all have been contiguous seeing that they c

Re: [GRASS-user] Converting raster to polygon creates too many polygons

2010-09-29 Thread razmjooeis
You might consider using -s flag to smooth the corners. Otherwise, I can't see why it doesn't work. R. Sab > Hi, > > I've created subcatchments using r.watershed and I would like to > convert these to polygons. My result at the moment contains too many > polygons - 194. The original raster had on

[GRASS-user] Converting raster to polygon creates too many polygons

2010-09-29 Thread Hanlie Pretorius
Hi, I've created subcatchments using r.watershed and I would like to convert these to polygons. My result at the moment contains too many polygons - 194. The original raster had only 9 areas, which should all have been contiguous seeing that they came from r.watershed. Here is the sequence of com