[GRASS-user] TOPOGRID equivalent in GRASS?

[Dylan Beaudette]

Hi Jonathan,

If I am not mistaken, TOPOGRID is just a front end to the well-known
interpolation algorithm used in Anudem
(http://cres.anu.edu.au/outputs/anudem.php).

To my knowlegde, and based on past mail-list traffic, GRASS does not
have an algorithm like this. You can approach this type of
functionality with v.surf.nbathy / v.suf.rst / etc, along with r.carve
to 'burn-in' the stream lines. Maciek has looked into this, and
contributed much discussion on the list.

There has been some recent traffic on some new scripts (v.???) built
by Maciek -- which incorporate stream lines (?) ..

This is something that a lot of us would like, but it would require
some planning and resources. r.terraflow does a good job of removing
sinks, but better use of break points, stream lines, and spot
elevation values would be nice.

Aslo -- see the example in the GRASS book, using multi-source
elevation data to interpolate a hillslope + gully feature using a
two-pass approach with v.surf.rst + r.patch.

cheers,

dylan

On 4/6/07, Jonathan Greenberg <greenberg at ucdavis.edu> wrote:
> I was curious if there is an equivalent of esri's topogrid in GRASS GIS (a
> way to generate "hydrologically correct digital elevation models (DEMs)")
> from point estimates of Z?
>
> --j
>
> --
> Jonathan A. Greenberg, PhD
> Postdoctoral Scholar
> Center for Spatial Technologies and Remote Sensing (CSTARS)
> University of California, Davis
> One Shields Avenue
> The Barn, Room 250N
> Davis, CA 95616
> Cell: 415-794-5043
> AIM: jgrn307
> MSN: jgrn307 at hotmail.com
>
>
>
> _______________________________________________
> grassuser mailing list
> grassuser at grass.itc.it
> http://grass.itc.it/mailman/listinfo/grassuser
>