<div dir="ltr">Hi,<div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Nov 4, 2013 at 1:36 PM, Rebecca Bennett <span dir="ltr"><<a href="mailto:rabennett@ymail.com" target="_blank">rabennett@ymail.com</a>></span> wrote:<br>
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<div><div><div><div style="font-size:10pt;font-family:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif"><div>Dear GRASS users,</div><div> </div><div>I have recently been made aware of the positive and negative openness vizualisations (Yokoyama et al 2002 <a rel="nofollow" href="http://www.asprs.org/a/publications/pers/2002journal/march/2002_mar_257-265.pdf" target="_blank">http://www.asprs.org/a/publications/pers/2002journal/march/2002_mar_257-265.pdf</a>) and would like to try to compute them in GRASS to help identify micro relief.</div>
<div> </div><div>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 <a rel="nofollow" href="http://geobrain.laits.gmu.edu/grassweb/manuals/raster/openness.html" target="_blank">http://geobrain.laits.gmu.edu/grassweb/manuals/raster/openness.html</a>)</div>
<div><a rel="nofollow" href="http://www.lpi.usra.edu/science/stepinskiWebPage/pdfFiles/geoinformaticsConf2009.pdf" target="_blank">http://www.lpi.usra.edu/science/stepinskiWebPage/pdfFiles/geoinformaticsConf2009.pdf</a></div>
<div> </div><div>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).</div><div> </div><div>All the best,</div><div>Rebecca</div><div> </div><div> </div></div></div></div></div></div></div></div></div></div>
</blockquote><div> </div><div>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.</div>
<div><br></div><div>Anna</div><div><br></div><div><br></div><div>[1] <a href="https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.skyview/">https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.skyview/</a><br></div>
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