Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-03-03 Thread Markus Neteler
On Tue, Feb 26, 2013 at 5:35 PM, John Mcgillicuddy jkmc...@mchsi.com wrote: Hello all, I am a member of a group of farmers and agribusinesses that would like to explore using grass or other open source gis as a replacement for the commercial ag gis platforms out there. Most of the

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread José María Michia Roberts
José María Michia Roberts: [...] many elements disappear after importing the layer, and more elements disappear after applying v.transform [...] In reply to myself: I now remember that I had solve this by adding -c to v.in.ogr, so the output layer is not cleaned and all source elements are

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread Benjamin Ducke
On 02/26/2013 01:32 PM, José María Michia Roberts wrote: José María Michia Roberts: [...] many elements disappear after importing the layer, and more elements disappear after applying v.transform [...] In reply to myself: I now remember that I had solve this by adding -c to v.in.ogr, so the

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread Jose M Michia Roberts
2013/2/26 Benjamin Ducke bendu...@fastmail.fm: A fix might be to introduce a new GRASS env variable that can be set to suppress the cleaning functions. While it would probably be trivial to implement this, it would also break with GRASS' basic design and the assumptions that its vector

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread Markus Metz
On Tue, Feb 26, 2013 at 2:36 PM, Jose M Michia Roberts jose.maria.mic...@gmail.com wrote: 2013/2/26 Benjamin Ducke bendu...@fastmail.fm: A fix might be to introduce a new GRASS env variable that can be set to suppress the cleaning functions. While it would probably be trivial to implement

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread Moritz Lennert
On 26/02/13 13:50, Benjamin Ducke wrote: On 02/26/2013 01:32 PM, José María Michia Roberts wrote: José María Michia Roberts: [...] many elements disappear after importing the layer, and more elements disappear after applying v.transform [...] In reply to myself: I now remember that I had

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread Jose M Michia Roberts
2013/2/26 Markus Metz markus.metz.gisw...@gmail.com: BTW, v.transform simply transforms coordinates, it does not do any cleaning. v.transform should actually work without topology, building topology on the output is optional (in GRASS 7). [...] For this particular problem (georectifying

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-26 Thread John Mcgillicuddy
Hello all, I am a member of a group of farmers and agribusinesses that would like to explore using grass or other open source gis as a replacement for the commercial ag gis platforms out there. Most of the desktop software is not being updated and the new systems are web based. These

[GRASS-user] Apply v.transform in polygons with overlays

2013-02-25 Thread José María Michia Roberts
Hi all! I need to use v.transform over layers that are topologically incorrect (so they have overlapped polygons, and it is not a problem). Of course, many elements disappear after importing the layer, and more elements disappear after applying v.transform. To solve this, I wrote a python

Re: [GRASS-user] Apply v.transform in polygons with overlays

2013-02-25 Thread Hamish
José wrote: Problem: I am not satisfied with the performance. The datasource has hundreds of thousands of elements and the process takes many hours to complete. try running v.split on the largest of the polygons. search the mailing list archives for the florida coastline problem. Hamish