[GRASS-user] Generate DEM with point and line vector

[leonidas]

I don't know if r.surf.contour is suitable for my data because there are
disjointed contour lines and spot elevation data between contour lines. So
according to the manual of r.surf.contour:"Violating these constraints will
cause non-intuitive anomalies to appear in the output map". Is there any
other tool appropriate for my data?Unfortunately there is no time to fix the
data.

Hamish wrote:
> 
> 
> leonidas wrote:
>> I need to generate a DEM using a line vector file (contours,
>> step=20m, some are disjoined) and also combine a second point
>> vector file with heights.How can I achieve that with Grass?
> 
> v.to.rast + r.surf.contour
> 
>> In the contours file there is also the coastline (height=0).Will
>> that produce any error?
> 
> yes, please read the r.surf.contour help page carefully about
> that.
> 
> 
> the quick workaround is to use r.mapcalc to multiply your raster
> input with:
> 
> r.mapcalc "contline_mult = (contlines*100000)+1"
> 
> then run r.surf.contour
> 
> then reverse the above multiplication:
> 
> r.mapcalc "dem = (contour_dem -1) / 100000"
> 
> 
> 
> besides that pain r.surf.contour does a really nice job.
> 
> 
> Hamish
> 
> 
> 
>       
> 
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> 
> 

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