Hamish & Brad,
Yes, this is the type of mathematical surface theory I am curious
about in GRASS.
My windows box has collapsed on me, and am looking at seriously using
GRASS/QGIS in future projects.
I have picked up on LandSerf in the mean time also:
http://www.soi.city.ac.uk/~jwo/landserf/
Jo Wood has some exemplary information and concise maths linked there
also.
The feature extraction is quite powerful.
Okay, back to rebuilding my Windows instal..
Joy!
On 8-Jul-07, at 1:08 AM, Brad Douglas wrote:
On Sun, 2007-07-08 at 19:54 +1200, Hamish wrote:
Amagine wrote:
Hello, I am trying to extract peak points from a digital elevation
map.
I would like to be able to regulate the following parameters:
Minimum height of peak
Minimum drop of surrounding peaks
Minimum radius from surrounding peaks
summit points
optional hierarchy...
Are there any tools in GRASS that may be able to do such an
extraction?
see wish about calculating topographic prominence:
http://thread.gmane.org/gmane.comp.gis.grass.user/19166/focus=19173
linked wikipedia article: "The underlying mathematical theory is
called
"Surface Network Modeling," and is closely related to Morse Theory."
if there is any interested topogapher in the house...
This may also be of interest:
http://www.peaklist.org/theory/theory.html
--
73, de Brad KB8UYR/6 <rez touchofmadness com>
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