On 24/09/18 17:05, Markus Neteler wrote:
On Fri, Sep 21, 2018 at 1:13 PM Johannes Radinger
<[email protected]> wrote:
Hi all,
this is maybe a very easy question: But how is it possible to identify
duplicate points (that have the same pair of coordinates) of a set of points.
I'd like to get the categories of all non-single (i.e.duplicate/triplicate
etc.) points. I know that I could use the 'rmdupl' tool from v.clean to remove
duplicate geometries but I'd rather like to manually select the duplicate
points I'd like to remove. Therefore, I'd need to identify the points with
similar geometries first. I thought of using v.distance to get the all points
that have 0 distance from another point but the result is 0 for all points (due
to the self-distance which is 0 of course). I could update the X,Y coordinates
of each point and the use a SQL command to identify points with similar
coordinate pairs; however, is there a more direct way or tool in GRASS to
perform such a task?
Did you see
https://grasswiki.osgeo.org/wiki/Find_multiple_points_in_same_position
?
If these solutions do not satisdy you, you could also try v.distance -a
with a very low dmax.
Moritz
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