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