[GRASS-user] Raster DEM generation

[Brian Sanjeewa Rupasinghe]

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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