How can I calculate Visibility using QGIS?

I have not found any suitable plugins for QGIS to do this.

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    Your question has been flagged up as of low quality due to its length. I hope you may be open to reading this Meta Question about What makes a Good Question? – PolyGeo Nov 13 '13 at 4:27
  • There is a saga gis visibility module. You could run that through processing if you have qgis 2.0.1 – johanvdw Nov 13 '13 at 8:20
  • If we're guessing about the question as duplicate, then it isn't clear enough. Please put some effort into describing the problem (not just naming it) – BradHards Nov 13 '13 at 10:50