Hey All. I figured out how to do this but I didn't use the esri tools as they currently do not have a tool set to support the creation of a visibility graph. There is a request on the "Esri Ideas" page though. Might want to find it and like it so it gets promoted. Here's what I did: - Download QGIS, GRASS, and the GRASS toolbox for QGIS (all free open source software). - You'll probably need to also download a GDAL library (check out www.maptools.com) Also free. - Open GRASS and make a new 'mapset'. (They have their own terminology for things and I'm a rookie so I might be getting these names wrong). You can import shapefiles directly into GRASS adn save them as a new mapset. - Open QGIS and make sure the GRASS Toolbox is downloaded. - Import GRASS mapset into QGIS instance via the toolbox. - Use GRASS toolbox in QGIS to run the VGA tool (http://grass.osgeo.org/grass64/manuals/v.net.visibility.html) I glossed over some things but this is the jist of it. If I can figure it out, you can too.
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