object ApproxViewshed extends Serializable
Created by jchien on 4/30/14.
This appears to be an implementation of the DEM/Xdraw Viewshed algorithm from [1].
1. Franklin, Wm Randolph, and Clark Ray. "Higher isn’t necessarily better: Visibility algorithms and experiments." Advances in GIS research: sixth international symposium on spatial data handling. Vol. 2. Taylor & Francis Edinburgh, 1994.
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