[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 <a...@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)
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