Hello,
I want to calculate voronoi areas for polygons, but I am stuck in
the "query-part".
using spearfish data I did:
v.extract input=fields@PERMANENT output=fields_extract list=41,36,46,21
v.to.points input=fields_extract output=fields_extract_points type=boundary
v.voronoi input=fields_extract_points output=fields_extract_points_voron
now I wanted to
- group all voronoi polygons which belong to points of one polygon (GIS query
overlap)
- calculate area of merged voronoi polygons and assign them to each original
polygon
but:
v.select operator=overlap gives:
v.select binput=fields_extract_points_voron_clean ainput=fields_extract_clean
atype=area btype=area output=test operator=overlap
Processing ainput areas ...
100%
Writing attributes ...
Layer 1
v.select complete.
Building topology ...
0 primitives registered
0 areas built
0 isles built
Attaching islands:
Attaching centroids: Topology was built.
Number of nodes : 0
Number of primitives: 0
Number of points : 0
Number of lines : 0
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0
anything wrong with the command?
I did it as well without b/atype=area but same result.
The problem how to calculate areas is not yet tackled ,-)
I appreciate any hint, Martin