Rebecca, I recall there was some capability w/in GRASS previously with terrain analysis, with classification of landform types -- but not using this nomenclature. Types were: slope, valley, ridge, saddle, etc... There may have been 'kettle' and 'dome' which seem to be close to your + and - openness. I can't remember the module. I know I have some F77 code buried away someplace written by a teacher years ago during my undergrad days taking geomorphology
Tom On Monday, November 4, 2013, Rebecca Bennett wrote: > Dear GRASS users, > > I have recently been made aware of the positive and negative openness > vizualisations (Yokoyama et al 2002 > http://www.asprs.org/a/publications/pers/2002journal/march/2002_mar_257-265.pdf) > and would like to try to compute them in GRASS to help identify micro > relief. > > Though I suspect that this has already been done, I can't find a heads up > other than this paper (which claims to have creates the web service based > on GRASS here > http://geobrain.laits.gmu.edu/grassweb/manuals/raster/openness.html) > > http://www.lpi.usra.edu/science/stepinskiWebPage/pdfFiles/geoinformaticsConf2009.pdf > > Just a note that although similar in it's aim of highlighting > microtopography, this is not quite the same as the r.horizon calculation > (image attached for clarification). > > All the best, > Rebecca > > > > > -- Thomas E Adams, III 718 McBurney Drive Lebanon, OH 45036 1 (513) 739-9512 (cell)
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