As it says. You have mistyped column name. Check column name and then try again.
Still in Your case I would try to interpolate with v.surf.rst first and then use result for analysis. Maris. 2013/1/13 Brian Sanjeewa Rupasinghe <[email protected]>: > Hi Maris, > > Many thanks for the advice. Further, i am going to use r.surf.contour to > generate a raster elevation DEM for viewshed analysis. The grass vector > contour layer that i have needs to be converted to raster contour. For this > i tried using v.to.rast function. Elevation field of contour layer is; > EL_Elevati which is a double precision data type. Following are the > parameters i used: > > v.to.rast input = terrain@topo1K type = line output = rasterCont use=attr > attrcolumn = EL_Elevati labelcolumn = cat > > However, when i run this it gives following error: > > dbmi: protocol error > ERROR: Column <EL_Elevati> not found > > Any suggestion on this is appreciated. > > Cheers, Brian. > > > On Sun, Jan 13, 2013 at 2:10 PM, Maris Nartiss <[email protected]> wrote: >> >> Hello, >> there are two options: >> 1st - join both datasets into single one (GRASS vectors can contain >> different geometries in single vector dataset) and use v.surf.rst (it >> will use both line and point data) >> 2nd - convert lines to points with v.to.points and then join into >> single point dataset. Interpolate with any tool. >> >> Good luck, >> Maris. >> >> 2013/1/12 Brian Sanjeewa Rupasinghe <[email protected]>: >> > Hi all, >> > >> > have two shape files containing height information of a certain area. >> > One >> > file consists of height information in contours (isolines) and the >> > othesr >> > file consists of height information with spot heights. In order to >> > create a >> > complete DEM i need heights of both layers. I need to create a raster >> > DEM >> > with winGRASS 7 using these information. What would be the best >> > technique to >> > generate raster DEM with these two types of data? Do i need to generate >> > some >> > spot heights from contours and then integerate with existing spot >> > heights >> > for DEM generation or any other method? >> > >> > Cheers, Brian >> > >> > _______________________________________________ >> > grass-user mailing list >> > [email protected] >> > http://lists.osgeo.org/mailman/listinfo/grass-user >> > > > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
