I have a dataset of ~100 archaeological sites (with x, y, and z values) and am trying to figure out which sites are visible from/to other sites.
To do this, I first used the construct sight lines tool to create lines between all site pairs. Then, I used the line of sight tool and a 10-meter resolution DEM to figure out which sites are visible to others. If I understand the line of sight tool correctly, it is the TarIsVis field in the output feature class that indicates whether a target (site) is visible if there is a 1, and not visible if there is a 0.
For a specific site, let's call it Site A, I'm getting the result that there are no sites that are visible from Site A. I know this isn't true because I've stood atop of Site A and could see to Site C, for example. Now I know that it's possible that the spatial accuracy of my coordinates or the resolution of the DEM could be causing this, so I did a viewshed analysis to compare.
What I found doing the viewshed analysis doesn't make sense to me. I used Site A as the input point and the same 10-meter DEM that was used for the line-of-sight tool as the input raster. According to the output raster, the pixel that corresponds with Site C is WITHIN the viewshed of Site A. So why is there no line-of-sight from Site A to Site C according to the line of sight tool? Are they not synonymous?
