[GRASS-user] Raster DEM generation

[Brian Sanjeewa Rupasinghe]

Thanks. I have not mistyped column name. In GRASS 7 that is what you get.

On Mon, Jan 14, 2013 at 12:38 PM, Maris Nartiss <maris.gis at gmail.com> wrote:

> 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 <jinkabs at gmail.com>:
> > 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 at 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 <maris.gis at gmail.com>
> 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 <jinkabs at gmail.com>:
> >> > 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
> >> > grass-user at lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/grass-user
> >> >
> >
> >
>
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