Viewshed intersection analysis and usage is disclosed. A plurality of object positions is obtained. Each object position is associated with a range. A relevant area is determined. Elevation data is obtained for a plurality of points in the relevant area. Lines of sight are evaluated between the plurality of points and the object positions within the associated ranges based on the elevation data. An interest zone comprising a subset of the plurality of points within the relevant area is determined. -22 60152-0124
