Hello,
I did a Viewshed from a point feature (using a DEM), but I would like to do it again but by "correcting" the point feature elevation by 90 meters.
In Line of sight, I can adjust the point feature elevation by entering "Z-units". In Viewshed, as far as I understand, the value that is entered in the Z-units is multiplied in the DEM, not changing the viewshed at all.
Does anybody know how can I do the viewshed for a higher elevation than was is recorded in the DEM, or must I manipulate the DEM for that?
Second question: How can I manipulate the DEM for the point element only?
(technical stuff: I'm using ARCGIS 9.3.1 with a metric prj)