[GRASS-user] calculation valley floor width in GRASS or some index indicating valley floor width?

[jwd]

On Tue, 1 Apr 2014 00:52:53 -0700 (PDT)
Helmut Kudrnovsky <hellik at web.de> wrote:

> hi,
> 
> any hint or pointer to some grass gis procedure/literature/web
> link/etc how to caculate valley floor width in GRASS or some index
> indicating valley floor width.
> 
> the idea is to get some measure how wide or narrow a valley is.
> 
> thanks in advance!
> 

That is a very involved question, starting with how you define the
valley floor quantitatively to begin with.  You could calculate an index
of concavity or average slope and plot the point where the measure (e.g.
concavity of slope, or average slope) drops below a certain value that
would be a valley floor boundary by definition.  There should be
several grass tools that could be applied.

JWDougherty