[GRASS-user] Raster DEM generation

[Maris Nartiss]

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
>> >
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>> >
>
>