[GRASS-user] S.K. Jenson and J.O. Domingue (1988) method to filter the elevation map

Markus Metz markus.metz.giswork at gmail.com
Thu Dec 12 10:10:00 PST 2019

On Thu, Dec 12, 2019 at 2:40 PM Luis Moreira <lfsmmoreira at gmail.com> wrote:
> "Can you inform us about the new methods you had in mind?"
> Well, there is a software (IPH-Hydro Tools) [from the Large Scale
> research group of the Institute of Hydraulic Research at the Federal
> University of Rio Grande do Sul, in Porto Alegre, Brazil]  which gives us
> three options as methods to remove depressions, namely:
> Heuristic Search (HS), Priority First Search (PFS) and Modified Heuristic
> Search (MHS).
> Do you know if GRASS uses one of theses methods?

I can't tell yet, but the search methods of the IPH-Hydro Tools could be
similar to what r.watershed/r.stream.extract/r.hydrodem use.
> As for my previous question:
> I read in Grass manual:
> "r.fill.dir filters and generates a depressionless elevation map and a
> direction map from a given raster elevation map. The method adopted to
> filter the elevation map and rectify it is based on the paper titled
> "Extracting topographic structure from digital elevation model data for
> geographic information system analysis" by S.K. Jenson and J.O. Domingue
> (1988)."
> I just want to know if indeed r.fill.dir function still operates precisely
> in the same methodology described in the mentioned paper. I am asking
> specifically about r.fill.dir, no r.watershed or other funcion.

The manual of r.fill.dir is correct.

Markus M
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