I am having a problem with the line of sight tool and viewsheds on ArcGIS 10.1. This is for a viewshed analysis of pillboxes and defences in a particular area in Malta.
I am using a DTM with a 1m cell size. Structures have been filtered out. A discrepancy has arisen with the Line of Sight and the Viewsheds. The observer point of both LoS and Viewshed are the same (1.78 metres) and the target height is also the same (1.7 metres). There are areas which the viewshed shows as visible while the line of sight is stating otherwise. Has anyone ever encountered such a problem before and how can I solve this?