[GRASS-user] Interpolation with v.surf.rst

[Markus Metz]

On Wed, Jan 16, 2013 at 11:06 AM, Brian Sanjeewa Rupasinghe
<jinkabs at gmail.com> wrote:
> Hi,
>
> When i omit -z flag, v.surf.rst function keeps on running and nothing
> happens. Here is what i used.
> v.surf.rst input=isoline at TOPOIKDATA zcolumn=height elev=elev_1m

v.surf.rst can take quite some time with many vector points and a
large region with high resolution. You could test with a smaller
region to adjust parameters, then process the whole region.

Markus M

>
> Brian
>
>
> On Wed, Jan 16, 2013 at 3:24 PM, Markus Metz <markus.metz.giswork at gmail.com>
> wrote:
>>
>> On Wed, Jan 16, 2013 at 10:16 AM, Brian Sanjeewa Rupasinghe
>> <jinkabs at gmail.com> wrote:
>> > Hi,
>> >
>> > I have 2D isolines in GRASS vector format with elevation in an attribute
>> > field called height.
>> > I used v.surf.rst function to create raster DEM. However, after
>> > creation, it
>> > outputs a DEM
>> > with value 0 elevation only. The description of the function is given as
>> > below. What would
>> > be the possible cause for this? I am using wingrass 7.
>> >
>> > cheers, Brian.
>> >
>> > v.surf.rst -z input=isoline at TOPOIKDATA zcolumn=height elev=elev_1m
>>
>> If you want to use elevation values from zcolumn, you should not use
>> the -z flag. Try instead
>> v.surf.rst input=isoline at TOPOIKDATA zcolumn=height elev=elev_1m
>>
>> Also make sure that the computational region extents and resolution
>> are set correctly.
>>
>> HTH,
>>
>> Markus M
>
>