[GRASS-user] v.to.rast: advice needed

[Markus Neteler]

Hi,

In addition, here is an overview page:

https://grasswiki.osgeo.org/wiki/Interpolation

Markus

On Wed, May 10, 2023 at 8:16 PM Maris Nartiss <maris.gis at gmail.com> wrote:
>
> I think you need to interpolate and not simply convert vector lines to
> raster lines. Make sure lines have an attribute with elevation (or z
> coordinate) and use e.g. v.surf.rst module.
>
> Māris.
>
> trešd., 2023. g. 10. maijs, plkst. 17:29 — lietotājs Rich Shepard
> (<rshepard at appl-ecosys.com>) rakstīja:
> >
> > I need to convert a vector contour map to a raster so I can apply the
> > hydrologic models modules.
> >
> > Reading the v.to.rast manual page I learned that I needed to add categories
> > to the input contour map. Running v.category added no categories: "0
> > features added."
> >
> > v.info does not tell me anything about the elevation values of the contour
> > lines. Looking at the v.* modules, and trying v.univar, didn't help. I could
> > try v.to.3d, but I need information about the vector map's contents.
> >
> > Which v.db* should I use to find the elevation colum associated with each
> > contour line?
> >
> > TIA,
> >
> > Rich
> >
> >
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-- 
Markus Neteler, PhD
https://www.mundialis.de - free data with free software
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