[GRASS-user] Peak point extraction from DEM

[Mars Sjoden]

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>
>