[GRASS-dev] Implementing MrVBF in GRASS

GRASS GIS GRASS GIS developer
1

Greetings, devs,

A popular covariate in the digital soil mapping community is the
multiresolution valley bottom flatness (MrVBF) index, proposed by John
Gallnd in 2003 [0]. While an open-source implementation is available
in SAGA-GIS [1], I would like to be able to produce this in my
favourite GIS environment.

As I was getting started using pygrass, I realised that Python may be
a bit slow for that sort of operations.

Did anyone heard about an implementation (even partial) in C?

Cheers,

Pierre

[0] http://www.agu.org/pubs/crossref/2003/2002WR001426.shtml
[1] http://read.pudn.com/downloads84/sourcecode/app/321905/saga_2/src/modules_terrain_analysis/terrain_analysis/ta_morphometry/mrvbf.cpp__.htm

--
Scientist
Landcare Research, New Zealand

2

On Tue, Dec 11, 2012 at 4:39 AM, Pierre Roudier
<pierre.roudier@gmail.com> wrote:

Greetings, devs,

A popular covariate in the digital soil mapping community is the
multiresolution valley bottom flatness (MrVBF) index, proposed by John
Gallnd in 2003 [0]. While an open-source implementation is available
in SAGA-GIS [1], I would like to be able to produce this in my
favourite GIS environment.

As I was getting started using pygrass, I realised that Python may be
a bit slow for that sort of operations.

.. I cannot judge this but I wonder if numpy etc won't be almost as fast
as C here?

Markus