Creating cumulative viewshed (non binary) using ArcGIS Desktop?

Question

In ArcGIS 10.2.For a viewshed calculation, as an input raster I have a DEM of an area. As an input feature a shapefile with 10 turbines.

Is it possible to create an output raster where the result is NOT just the "visible" or "not visible" one ?

I would like to create a raster that shows how many turbines are visible for each point.

Answer 1

If you can access to 3D Analyst or Spatial Analyst extensions, Visibility tool is your answer, which is defined as:

Determines the raster surface locations visible to a set of observer features, or identifies which observer points are visible from each raster surface location.

Particularly, if you pick Frequency in Analysis Type parameter, it will produce what is visible (in overall, I think it uses OR operation) and how many times a specific cell is visible to observer points, without specifying which ones though.