Re: [GRASS-user] v.overlay with points
v.what.vect is doing exactly what I was searching for. The last module on the list ;) Laurent Le sam. 28 juil. 2018 à 18:04, Laurent C. a écrit : > Hello all, > > I have two vectors maps: > - Map A with only points > - Map B with polygons representing continents (with a name column) > > I want to add a column in map A that contains the continent name on which > the point is located. > I thought of using v.overlay, but it doesn't work with points. > > Which tool should I use for that? > > Regards, > Laurent > ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] v.overlay with points
Hello all, I have two vectors maps: - Map A with only points - Map B with polygons representing continents (with a name column) I want to add a column in map A that contains the continent name on which the point is located. I thought of using v.overlay, but it doesn't work with points. Which tool should I use for that? Regards, Laurent ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.overlay and points?
Hi, On Monday 18 of March 2013 20:14:54 you wrote: Im trying combine 2 vector maps, one with areas, the other with solely points. [..] It is not possible to use v.overlay on points AND areas. Check the manual: http://grass.osgeo.org/grass64/manuals/v.overlay.html. Maybe you simply want to merge the two vector maps? In that case, v.patch will do it. Best, Nikos signature.asc Description: This is a digitally signed message part. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.overlay and points?
Nikos, Thanks for the reply. Will v.patch merge the attribute table so all of the data will be combined together in a new attribute table? I am trying to merge 2 files, one with plot and address info (area) and the second with property owner info (point). Both of these files contain information about the the plot of land hence they precisely overlay each other, but neither contain any data, besides geography,that can be used to merge the files. Charlie From: Nikos Alexandris n...@nikosalexandris.net To: charlie caro...@yahoo.com Cc: grass-user@lists.osgeo.org grass-user@lists.osgeo.org Sent: Tuesday, March 19, 2013 4:58 AM Subject: Re: [GRASS-user] v.overlay and points? Hi, On Monday 18 of March 2013 20:14:54 you wrote: Im trying combine 2 vector maps, one with areas, the other with solely points. [..] It is not possible to use v.overlay on points AND areas. Check the manual: http://grass.osgeo.org/grass64/manuals/v.overlay.html. Maybe you simply want to merge the two vector maps? In that case, v.patch will do it. Best, Nikos___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.overlay and points?
charlie wrote: Will v.patch merge the attribute table so all of the data will be combined together in a new attribute table? Well, if both (all) original tables are identically structured, you may use the -e flag to copy over the attribute tables. In the case of points and boundaries I guess you don't need to v.clean afterwards (not sure though -- it is something users *should* do after merging for example overlapping/duplicate features). If your tables are different, then you'd need to handcraft I guess the table (again!). First you'd need to add the table of the patched map in the database (it is not added, so one requires to instruct v.db.addtable) and then add columns (v.db.addcol -- or v.db.addcolumn for GRASS7) and populate them as desired (v.to.db). I am trying to merge 2 files, one with plot and address info (area) and the second with property owner info (point). If the points refer to the plots I think your better off by using the GRASS approach: an area consists of boundaries and centroids. You may then use the boundaries for area statistics and still have the centroids to use for point- like tasks (?). ( Please, do not take for granted what I state -- I am recovering slowly in to all this as I was absent for a long time. I feel much more confident in the raster planet than in the vector planet since my last work was mainly on raster stuff. ) Both of these files contain information about the the plot of land hence they precisely overlay each other, but neither contain any data, besides geography, that can be used to merge the files. Maybe that fits the picture then -- boundaries and centroids. Please, review the following which, I think, are of your interest: - http://grass.osgeo.org/grass64/manuals/vectorintro.html - http://grass.osgeo.org/grass64/manuals/databaseintro.html One thing is for sure: you have in GRASS all the tools you might need for processing plots :-) Best, Nikos Nikos signature.asc Description: This is a digitally signed message part. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.overlay and points?
On Tuesday 19 of March 2013 19:57:36 Nikos Alexandris wrote: charlie wrote: .. Both of these files contain information about the the plot of land hence they precisely overlay each other, but neither contain any data, besides geography, that can be used to merge the files. Then again, you may only require to add centroids to the plot map? Something like v.centroids in=OnlyBoundariesMap out=Plots option=add Check however the cat= parameter (what and how). Best of Luck, Nikos signature.asc Description: This is a digitally signed message part. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.overlay and points?
On Tue, Mar 19, 2013 at 2:50 PM, charlie caro...@yahoo.com wrote: Nikos, Thanks for the reply. Will v.patch merge the attribute table so all of the data will be combined together in a new attribute table? I am trying to merge 2 files, one with plot and address info (area) and the second with property owner info (point). Both of these files contain information about the the plot of land hence they precisely overlay each other, but neither contain any data, besides geography,that can be used to merge the files. That sounds more like a job for v.distance where you can upload attributes from the nearest feature in map B to Map A. In GRASS 6 you can upload area info to the points, in GRASS 7 you can also upload point info to the areas. HTH, Markus M ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] v.overlay and points?
Im trying combine 2 vector maps, one with areas, the other with solely points. V.overlay fails with any file that only has points, is there any way around this? I was thinking of changing the point to an area , ie 1x1 meter, to work around this limitation, but Im not certain if this is possible or advisable. Does anyone have any ideas? Thanks! Charlie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.overlay and points?
Hello Charlie, v.what.vect might be the function you need. Have you tried that? Success! Miguel 2013/3/19 charlie caro...@yahoo.com Im trying combine 2 vector maps, one with areas, the other with solely points. V.overlay fails with any file that only has points, is there any way around this? I was thinking of changing the point to an area , ie 1x1 meter, to work around this limitation, but Im not certain if this is possible or advisable. Does anyone have any ideas? Thanks! Charlie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
