A Unique Viewshed Analysis
In another example the USGS used a viewshed analysis to assist NASA's MER project. When NASA needed to find appropriate landing spots for the Mars rovers, they turned to the USGS to map the best possible sites. Part of the analysis included a viewshed of the possible site selections. In this case the viewshed indicates the areas which may or may not be viewable by the Mars rovers from each landing site(MER Landing Site Viewshed Analysis).
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