<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:10pt"><div style="display: block;" class="yahoo_quoted"><div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 10pt;"><div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 12pt;"><div class="y_msg_container"><div id="yiv3302526006"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:10pt;"><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" target="_blank"
href="http://www.asprs.org/a/publications/pers/2002journal/march/2002_mar_257-265.pdf">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" target="_blank" href="http://geobrain.laits.gmu.edu/grassweb/manuals/raster/openness.html">http://geobrain.laits.gmu.edu/grassweb/manuals/raster/openness.html</a>)</div><div><a rel="nofollow" target="_blank" href="http://www.lpi.usra.edu/science/stepinskiWebPage/pdfFiles/geoinformaticsConf2009.pdf">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><br><br></div> </div> </div> </div> </div></body></html>