[Gvsig_english] Visibility analysis

[Angus Jeffery]

Hi Antonio
Thank you for setting out an approach. I will need to consider what to do
as scripting is out of my league.
If you are available/interested on freelance basis for this sort of thing,
please contact me off the message list to discuss.
Kind regards
Angus


On 24 September 2013 15:32, Antonio Falciano <afalciano at yahoo.it> wrote:

> Il 24/09/2013 13:26, Angus Jeffery ha scritto:
> > Hi Antonio
> > Thanks for your reply. Very interesting despite my lack of Italian and I
> > can see some application for your research.
> > However, it's not quite what I meant - what I want to try to do is work
> > out which part of a defined site (I have a polygon) is least (or most)
> > visible from the surrounding landscape within a defined radius (I have
> > raster of elevation data). Any ideas?
>
> Hi Angus,
> I'd convert the polygon into a set of equispaced points using e.g. the
> SEXTANTE "Create graticule" tool (to be clipped). The distance to adopt
> should be the DEM cell size. Each point can be considered as a single
> target and then be used for the computation of a binary viewshed in
> order to understand from where it's visible within the search radius.
> The number of pixels of the binary viewshed whose value is equal to 1
> (i.e. the sum of all the values within the search radius) will represent
> the score of each point. Higher is the score, more visible from
> different places the point will be. It could be calculated with the
> SEXTANTE "Basic statistics" tool.
> The complex part is that we have to iterate over all the points and for
> sure the best approach is to do it programmatically, e.g. with some
> BeanShell scripting under SEXTANTE or Bash/Python under GRASS GIS.
>
> Cheers,
> Antonio
>
> --
> Antonio Falciano
> http://www.linkedin.com/in/antoniofalciano
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