[GRASS-user] Openness Calculation

Anna Petrášová kratochanna at gmail.com
Mon Nov 4 11:16:13 PST 2013


On Mon, Nov 4, 2013 at 1:36 PM, Rebecca Bennett <rabennett at ymail.com> 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

I added recently a module r.skyview to grass 7 addons  for computing the
sky-view factor [1]. It uses r.horizon module.  I am not sure how much
different is what r.horizon can do and what you need but it's worth looking
if r.horizon cannot be extended easily and then used for the openness


[1] https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.skyview/

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