We're struggling to add this into our r.landscape.evol script at the
moment. We have a plan and the first parts are going pretty well. But
we'll have to see if we can get the rest. A module that did this well
would be a big help for modeling stream flow.
Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University
Phone: 480-965-6262
Fax: 480-965-7671
www: www.public.asu.edu/~cmbarton, http://csdc.asu.edu
On Nov 15, 2009, at 10:00 AM, [email protected] wrote:
Message: 4
Date: Sat, 14 Nov 2009 19:52:52 -0800 (PST)
From: Hamish <[email protected]>
Subject: Re: [GRASS-dev] Need ideas for a masters thesis...
To: David Townshend <[email protected]>, Thomas Adams
<[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8
Thomas wrote:
If you come from a hydraulics background??? one very
important need is the ability to generate channel
cross-sections interactively for, say, HEC-RAS and then do
flood inundation mapping from HEC-RAS from the modeling
results ??? I would think this would be a huge
contribution.
to get a good cross section you need to set it perpendicular to the
river's
center line. Which means you need a good river centerline. Which
means you
have to deal with the "river mile problem".
raster tools are not always good here as the river can be very thin
compared to the overall length leading to untenable resolution
settings
to get an good result. (r.cost + r.param.scale to pull out the cost
ridges or r.slope.aspect to pull out the maxima from the 1st
derivative
of the cost works, but the resolution issue gets ya)
any thoughts? some sort of reverse v.buffer?
small islands within the river also cause havoc with many
computational
approaches.
Hamish
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