[GRASS-user] Openness Calculation

[Anna Petrášová]

Hi,


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
computation.

Anna


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

>
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