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

[洪朝貴]

Thank you Markus! It works now.

Printing the current region could help.
Re-wording the manual page may also help.
"Unlike most other vector functions, setting the
computation region is mandatory in order to deal with
infinite regions in the Voronoi diagrams."
Or something prominent like that.
I read somewhere that vector operations are not
affected by the region setting, and had success with
v.distance and v.delaunay without ever setting it.
The v.voronoi manual says
"The  bounds  of  the  output map are limited by the current region."
but I somehow ignored it as something to worry about later
if and when I get some output :-)



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2017-11-25 20:48 GMT+08:00 Markus Neteler <neteler at osgeo.org>:
> On Nov 25, 2017 11:48 AM, "Markus Metz" <markus.metz.giswork at gmail.com>
> wrote:
>> On Sat, Nov 25, 2017 at 3:07 AM, 洪朝貴 <ckhung at cyut.edu.tw> wrote:
> ...
>> > 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.
>
> Would it make sense to print the used region settings to help the user?
>
> Best,
> markusN