code I item #452, was opened at 2007-08-05 21:36 Status: Open Priority: 3 Submitted By: Andras Fabian (alpilotx) Assigned to: Nobody (None) Summary: v.overlay misses some vector elemnts with "and" operator Issue type: other bug Issue status: None GRASS version: CVS HEAD GRASS component: vector Operating system: Linux Operating system version: SUSE Linus 10.2 / Kernel 2.6.21 GRASS CVS checkout date, if applies (YYMMDD): 070804
Initial Comment: I have noticed a new issue with v.overlay and the "and" operator, although I don't know, if this is in some way related to "[#384] v.overlay with 'and' operator sometimes produces wrong results" http://wald.intevation.org/tracker/index.php?func=detail&aid=384&group_id=21&atid=204 (which was added to the tracker Maciej Sieczka in my name - though nothing happened on that bug, why ???) OK, this time it looks like this. I have a set of vectory polygons (call it "polygons_select") and one larger vector polygon which almost overlaps the previous ones (call it "eco_clipped_central_appalachian"). Now, I would like to cut A by B, so I obviously do a v.overlay with "and". Or as it looks in reality: " v.overlay ainput=polygons_select atype=area alayer=1 binput=eco_clipped_central_appalachian btype=area blayer=1 output=polygons_current operator=and olayer=1,0,0 --overwrite " Now the resulting "polygons_current" is missing some polygons, which should obviously NOT be missing! See attached screenshots: - polygons_select.jpg is where I start - polygons_select_WITH_eco_clipped_central_appalachian.jpg shows the second polygon (in transparent yellow) which I would like to overlay with the first ones. - polygons_current.jpg shows with the red arrow, where one polygon is missing. I also attach the vector sets from GRASS, so maybe someone could test it out. As I'm working on a slightly time critical project, it would be very helpful to have some response within the next weeks. Thank you very much! Andras Fabian http://www.alpilotx.de (where many infos about my project can be seen) ---------------------------------------------------------------------- You can respond by visiting: http://wald.intevation.org/tracker/?func=detail&atid=204&aid=452&group_id=21 _______________________________________________ grass-dev mailing list [email protected] http://grass.itc.it/mailman/listinfo/grass-dev
