Viewshed Issue

Discussion created by nslucash on Jul 13, 2011
I'm running the Viewshed tool using Lidar with 1m post spacing.  I have a an observer point and target point attributed with an OFFSETA and OFFSETB at 5m.  I need to run the Viewshed multiple time for targets at multiple distances from a static observer point.  As i increase the RADIUS2 at increments of 50 meters out to 350 meteres I notice slight changes in pixels becoming Visible and Not Visible in the inner regions that I would think would not change.  Why would these values change if I'm accepting all other defaults?  I don't think that the small number of changes will impact my analysis, but I'm just curious to why this would happen.