[GRASS-user] Deleting vertices based on a list of points
Moritz Lennert
mlennert at club.worldonline.be
Wed Jun 3 04:50:53 EDT 2009
On 02/06/09 20:50, Dwight Needels wrote:
> Hi all,
>
> I have two vectors: Vector A has lines and Vector B has points that
> share the same coordinates as a subset of the vertices in the lines. I
> would like to delete all of the vertices/nodes in Vector A that lie
> directly underneath the points in Vector B (or perhaps lie within a
> threshold).
>
> I suspect that v.edit tool=vertexdel can do this, but I cannot figure
> out how to pass the coordinates of a set of points from Vector B to
> v.edit to be used to select vertices in Vector A for deletion. Could
> somebody give me a hand with this (or tell me it is not possible)?
Feed the output of v.to.db -p option=coor on Vector B into the coords=
parameter of v.edit on Vector A, i.e. something like this:
v.edit A tool=vertexdel coords=`v.to.db -p B option=coor --quiet | awk
-F";" '{printf"%f,%f,",$2,$3} END{printf"\n"}'`
Moritz
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