<HTML><HEAD><TITLE>Re: [Gvsig_english] SEXTANTE Visibility Tool</TITLE>
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<DIV><FONT color=#000000 size=2 face=Arial>Hi Antonio,</FONT></DIV>
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<DIV><FONT size=2 face=Arial>we are collaborating with Sextante team for developing a 3D visibility algorithm. That is, given a 3D object placed on a digital terrain model, calculate the visibility area. In this case it won't be a 0/1 raster output, but a raster with a cell value depending on how much the object is seen from any point.</FONT></DIV>
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<DIV><FONT size=2 face=Arial>Depending on the scale, you may not assume a wind turbine is a point.</FONT></DIV>
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<DIV><FONT size=2 face=Arial>Unfortunatelly, it will take a while (weeks/months). We'll update this list.</FONT></DIV>
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<DIV><FONT size=2 face=Arial>Best,</FONT></DIV>
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<DIV><FONT size=2 face=Arial>Miguel Montesinos</FONT></DIV></DIV>
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<FONT size=2 face=Tahoma><B>De:</B> gvsig_internacional-bounces@listserv.gva.es en nombre de Antonio Falciano<BR><B>Enviado el:</B> mié 22/12/2010 11:06<BR><B>Para:</B> gvsig_internacional@listserv.gva.es<BR><B>Asunto:</B> Re: [Gvsig_english] SEXTANTE Visibility Tool<BR></FONT><BR></DIV>
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<P><FONT size=2>Il 22/12/2010 0.10, Angus Jeffery ha scritto:<BR>> Hello<BR>> This Sextante Visibility tool is great. However, does anybody know if<BR>> it is possible to show the visibility of more than one point, for<BR>> example an array of wind turbines? Is it possible to do this by<BR>> referring to a .shp or .dxf which contains point data and contains<BR>> height attributes, etc.? Does anybody know if the tool takes into<BR>> account, or if it is possible to take into account earth curvature -<BR>> this is unlikely to be significant at close range, but could be at<BR>> 10km plus.<BR>Hi Angus,<BR>you could calculate "cumulative viewsheds" in SEXTANTE using its<BR>Modeler (or Beanshell scripts). You should make an intensive use<BR>of Map Algebra by Raster Calculator in order to take in count the<BR>effects of earth curvature and atmospheric refraction (because Visibility<BR>tool doesn't actually), to consider the heights of wind turbines,<BR>observers and so on...<BR><BR>Cheers,<BR>Antonio<BR><BR>--<BR>Antonio Falciano<BR><A href="http://www.linkedin.com/in/antoniofalciano">http://www.linkedin.com/in/antoniofalciano</A><BR><BR>_______________________________________________<BR>Gvsig_internacional mailing list<BR>Gvsig_internacional@listserv.gva.es<BR><A href="http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional">http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional</A><BR></FONT></P></DIV></BODY></HTML>