[GRASSLIST:10740] GRASS topographic position functionality beyond r.param.scale?

[Graham Watt-Gremm]

Hi Ian (and/or GRASS user list),
Did you ever get a response to this query, or develop something  
yourself? I would like to get at the (unidentified Arc/Info) slope  
position algorithm used by Wimberly and Spies (2001, Ecology 82(5): 
1443-1459), where topographic position grades from 0 at valley bottom  
to 100 at ridge top. I am thinking along the lines of using some of  
the output from r.flow (flowline segments in each cell a function of  
transformed distance from valley bottom), though I have no experience  
with this module. Does anyone have any suggestions?

Cheers and thanks,

Graham Watt-Gremm
Rocky Mountain Repeat Photography Project
School of Environmental Studies
University of Victoria
sunyata at uvic dot ca

[GRASSLIST:1410] GRASS topographic position functionality beyond  
r.param.scale?

Ian Allan iallan at geocode.com.au
Mon, 06 Oct 2003 12:29:41 +1000

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Hi

Can anyone suggest a technique for determining topographic position that
would provide more information than r.param.scale? In particular, I'm
interested in mapping upper slopes, mid slopes and lower slopes.

Many thanks

Ian Allan






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