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This paper describes the design and engineering of algorithms for computing visibility maps on massive grid terrains. Given a terrain <i>T</i>, specified by the elevations of points in a regular grid, and given a <i>viewpoint v</i>, the <i>visibility map</i> or <i>viewshed</i> of <i>v</i> is the set of grid points of <i>T</i> that are visible from <i>v</i>.(More)
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