Re: [GRASS-user] v.to.rast: advice needed
On Wed, 10 May 2023, Rich Shepard wrote: Thanks very much. I'm learning many new things on this project and still need to meet regulator's deadlines. Markus, The wiki page on 'Contour lines to DEM' is what I need. Best regards, Rich ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.to.rast: advice needed
On Wed, 10 May 2023, Markus Neteler wrote: In addition, here is an overview page: https://grasswiki.osgeo.org/wiki/Interpolation Markus, Thanks very much. I'm learning many new things on this project and still need to meet regulator's deadlines. Much appreciated, Rich ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.to.rast: advice needed
Hi, In addition, here is an overview page: https://grasswiki.osgeo.org/wiki/Interpolation Markus On Wed, May 10, 2023 at 8:16 PM Maris Nartiss wrote: > > I think you need to interpolate and not simply convert vector lines to > raster lines. Make sure lines have an attribute with elevation (or z > coordinate) and use e.g. v.surf.rst module. > > Māris. > > trešd., 2023. g. 10. maijs, plkst. 17:29 — lietotājs Rich Shepard > () rakstīja: > > > > I need to convert a vector contour map to a raster so I can apply the > > hydrologic models modules. > > > > Reading the v.to.rast manual page I learned that I needed to add categories > > to the input contour map. Running v.category added no categories: "0 > > features added." > > > > v.info does not tell me anything about the elevation values of the contour > > lines. Looking at the v.* modules, and trying v.univar, didn't help. I could > > try v.to.3d, but I need information about the vector map's contents. > > > > Which v.db* should I use to find the elevation colum associated with each > > contour line? > > > > TIA, > > > > Rich > > > > > > ___ > > grass-user mailing list > > grass-user@lists.osgeo.org > > https://lists.osgeo.org/mailman/listinfo/grass-user > ___ > grass-user mailing list > grass-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/grass-user -- Markus Neteler, PhD https://www.mundialis.de - free data with free software https://grass.osgeo.org https://courses.neteler.org/blog ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.to.rast: advice needed
On Wed, 10 May 2023, Maris Nartiss wrote: I think you need to interpolate and not simply convert vector lines to raster lines. Make sure lines have an attribute with elevation (or z coordinate) and use e.g. v.surf.rst module. Māris. Interpolating the vector contour file before rasterizing makes sense to me, too. Never before having to convert a vector elevation contour file to a raster file I'd no idea which v.surf.* module to apply. The vector file has a ContourEle attribute with the elevation values. I'm taking your advice and will use v.surf.rast. This project has more topography data issues than any I've encountered since I started using grass with version 4.0 (all integer, all CLI.) Very much appreciated, Rich ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.to.rast: advice needed
I think you need to interpolate and not simply convert vector lines to raster lines. Make sure lines have an attribute with elevation (or z coordinate) and use e.g. v.surf.rst module. Māris. trešd., 2023. g. 10. maijs, plkst. 17:29 — lietotājs Rich Shepard () rakstīja: > > I need to convert a vector contour map to a raster so I can apply the > hydrologic models modules. > > Reading the v.to.rast manual page I learned that I needed to add categories > to the input contour map. Running v.category added no categories: "0 > features added." > > v.info does not tell me anything about the elevation values of the contour > lines. Looking at the v.* modules, and trying v.univar, didn't help. I could > try v.to.3d, but I need information about the vector map's contents. > > Which v.db* should I use to find the elevation colum associated with each > contour line? > > TIA, > > Rich > > > ___ > grass-user mailing list > grass-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] v.to.rast: advice needed [RESOLVED]
On Wed, 10 May 2023, Rich Shepard wrote: Which v.db* should I use to find the elevation colum associated with each contour line? Long ago I used the GUI and it had a menu to examine the vector map's table. Now, I just leared that v.db.select will work. There're more columns than I need, but one does have the elevation data. Back to work ... Rich ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
