[GRASS-user] v.voronoi error: Found 0 points/centroids, but at least 2 are needed

[Markus Metz]

On Sat, Nov 25, 2017 at 3:07 AM, 洪朝貴 <ckhung at cyut.edu.tw> wrote:
>
> Dear All,
>
> I am a linux veteran and a grass newbie comfortable with
> file format conversions and most interested in grass
> v.* commands because of its rich algorithms and
> the possibility of scripting/automation.
>
> I imported the attached geojson file like this:
>     v.in.ogr input=tkec.geojson output=tkec
> and tried these two commands:
>     v.delaunay input=tkec output=tkecdt
>     v.voronoi input=tkec output=tkecv
> The Delaunay triangulation works perfectly and looks nice
> after I exported it and displayed it in some other program.
> The Voronoi diagram command, however, gives the error message:
>     Found 0 points/centroids in <tkec at work>, but at least 2 are needed
>
> I tried it in grass 7.0.3 of lubuntu 16.04 and
> grass 7.2.0 of lubuntu 17.04 .
> The error messages are the same.
> Did I miss some steps before calling v.voronoi?

v.voronoi uses the current region (the algorithm requires this), therefore
you need to set an appropriate computational region first, e.g. with

g.region -pa vect=tkec res=1

before using v.voronoi.

> Many thanks in advance for your help!

HTH,

Markus M
>
>
> --
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> Chao-Kuei Hung 洪朝貴
>
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