[GRASS 6.4 windows XP – accessed mostly via QGis but here I’ll be using the CLI]
[not sure which sub-version of GRASS, I believe the latest one installed two days ago from OSGeo “package manager”]
My second problem involves clipping vectors. I do have a vector theme (geological map) with a correct topology, as far as I can tell – boundaries and centroids; QGis happily reads it as a polygon theme anyway, without apparent errors. I can also convert it to a clean raster, etc.
I also have another vector theme, containing only one polygon : my area of interest.
I want to clip my Geol_map to the extent of the Area; and I try the following :
v.overlay ainput=Geol_map atype=area alayer=1 binput=Area btype=area blayer=0 output=Geol_map_clipped operator=and
The result follows; basically, no polygon nor contour is created…
Thanks for any advice !
JFM
v.overlay ainput=Geol_map atype=area alayer=1 binput=Area btype=area blayer=0 output=Geol_map_clipped operator=and
(… first lines of the log truncated by command.com, darn, must really switch to a sensible shell…)
(…) GRASS_INFO_PERCENT: 100
GRASS_INFO_MESSAGE(5356,40): Querying vector map Area@Brinsley…
GRASS_INFO_END(5356,40)
GRASS_INFO_PERCENT: 16
(…)
GRASS_INFO_PERCENT: 100
GRASS_INFO_PERCENT: 1
(…)
GRASS_INFO_PERCENT: 100
GRASS_INFO_MESSAGE(5356,41): Writing centroids…
GRASS_INFO_END(5356,41)
GRASS_INFO_MESSAGE(5356,42): Attaching centroids…
GRASS_INFO_END(5356,42)
GRASS_INFO_MESSAGE(5356,43): Building topology for vector map <Geol_map_clipped>
…
GRASS_INFO_END(5356,43)
GRASS_INFO_MESSAGE(5356,44): Attaching centroids…
GRASS_INFO_END(5356,44)
GRASS_INFO_PERCENT: 1
(…)
GRASS_INFO_PERCENT: 100
GRASS_INFO_MESSAGE(5356,45): Number of nodes: 1365
GRASS_INFO_END(5356,45)
GRASS_INFO_MESSAGE(5356,46): Number of primitives: 2103
GRASS_INFO_END(5356,46)
GRASS_INFO_MESSAGE(5356,47): Number of points: 0
GRASS_INFO_END(5356,47)
GRASS_INFO_MESSAGE(5356,48): Number of lines: 0
GRASS_INFO_END(5356,48)
GRASS_INFO_MESSAGE(5356,49): Number of boundaries: 2103
GRASS_INFO_END(5356,49)
GRASS_INFO_MESSAGE(5356,50): Number of centroids: 0
GRASS_INFO_END(5356,50)
GRASS_INFO_MESSAGE(5356,51): Number of areas: 595
GRASS_INFO_END(5356,51)
GRASS_INFO_MESSAGE(5356,52): Number of isles: 63
GRASS_INFO_END(5356,52)
GRASS_INFO_MESSAGE(5356,53): Number of incorrect boundaries: 4
GRASS_INFO_END(5356,53)
GRASS_INFO_MESSAGE(5356,54): Number of areas without centroid: 595
GRASS_INFO_END(5356,54)
GRASS_INFO_PERCENT: 1
(…)
GRASS_INFO_PERCENT: 100
GRASS_INFO_MESSAGE(5356,55): Rebuilding topology…
GRASS_INFO_END(5356,55)
GRASS_INFO_MESSAGE(5356,56): Building topology for vector map <Geol_map_clipped>
…
GRASS_INFO_END(5356,56)
GRASS_INFO_MESSAGE(5356,57): Registering primitives…
GRASS_INFO_END(5356,57)
GRASS_INFO_MESSAGE(5356,58): 0 primitives registered
GRASS_INFO_END(5356,58)
GRASS_INFO_MESSAGE(5356,59): 0 vertices registered
GRASS_INFO_END(5356,59)
GRASS_INFO_MESSAGE(5356,60): Building areas…
GRASS_INFO_END(5356,60)
GRASS_INFO_MESSAGE(5356,61): 0 areas built
GRASS_INFO_END(5356,61)
GRASS_INFO_MESSAGE(5356,62): 0 isles built
GRASS_INFO_END(5356,62)
GRASS_INFO_MESSAGE(5356,63): Attaching islands…
GRASS_INFO_END(5356,63)
GRASS_INFO_MESSAGE(5356,64): Attaching centroids…
GRASS_INFO_END(5356,64)
GRASS_INFO_MESSAGE(5356,65): Number of nodes: 0
GRASS_INFO_END(5356,65)
GRASS_INFO_MESSAGE(5356,66): Number of primitives: 0
GRASS_INFO_END(5356,66)
GRASS_INFO_MESSAGE(5356,67): Number of points: 0
GRASS_INFO_END(5356,67)
GRASS_INFO_MESSAGE(5356,68): Number of lines: 0
GRASS_INFO_END(5356,68)
GRASS_INFO_MESSAGE(5356,69): Number of boundaries: 0
GRASS_INFO_END(5356,69)
GRASS_INFO_MESSAGE(5356,70): Number of centroids: 0
GRASS_INFO_END(5356,70)
GRASS_INFO_MESSAGE(5356,71): Number of areas: 0
GRASS_INFO_END(5356,71)
GRASS_INFO_MESSAGE(5356,72): Number of isles: 0
GRASS_INFO_END(5356,72)
GRASS_INFO_MESSAGE(5356,73): v.overlay complete.
GRASS_INFO_END(5356,73)