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Is there a way to perform a Viewshed Analysis with the Standard license of ArcGIS 10.1 for Desktop?
If not, what is the difference (if any) between:
Viewshed with (Spatial Analyst)- http://resources.arcgis.com/en/help/main/10.1/index.html#/Viewshed/009z000000v3000000/
and
Viewshed with (3D Analyst)- http://resources.arcgis.com/en/help/main/10.1/index.html#//00q900000033000000
According to the licensing information, they probably share the same algorithms Licensing Information
ArcGIS for Desktop Basic: Requires 3D Analyst or Spatial Analyst
ArcGIS for Desktop Standard: Requires 3D Analyst or Spatial Analyst
ArcGIS for Desktop Advanced: Requires 3D Analyst or Spatial Analyst
And it can't be done without one of those two extensions in ArcGIS
There is no difference between Viewshed-3D and Viewshed-Spatial in terms of functionality.
As per page 7 of the functionality matrix here: http://www.esri.com/library/brochures/pdfs/arcgis-server-functionality-matrix.pdf You can add extensions to ArcGIS Server Standard. You'd have to add one of those extensions to do Viewshed.
My answer above was for Server in terms of licensing. Refer to Dan's answer for Desktop. My point on the same functionality is valid for both Desktop and Server
