[GRASS-user] Help to compute polygon extent

2010-04-30 Thread Sophie Leguedois
Dear all, I would to compute the maximum extent length for multipart polygons (ie the distance between the 2 remotest vertices of the boundary limit; see the attached picture). Is there a designated tool to do that or do I have to compute it? http://n2.nabble.com/forum/FileDownload.jtp?type=n&i

[GRASS-user] Re: Extract coordinates of vertices/nodes

2010-04-30 Thread Sophie Leguedois
Thank you very much for your useful answers. The commands v.to.point and v.out.ascii are doing the trick! About vertices and nodes, I noticed that you can have several nodes for the boundary limit of a polygon. Why so? Is it beacuse the nature of the neighbour polygon is different? Regards, So.

[GRASS-user] Extract coordinates of vertices/nodes

2010-04-28 Thread Sophie Leguedois
Greetings, Being quite in Grass, I am trying to find a way to extract geographic coordinates of vertices and nodes (by the way I am struggling a little to understand the differences between those two concepts) for polygons or lines. Do you have any idea how to proceed? Cheers So.L. -- View th