thank you for the reply Sol, but my area is located in israel, and the only elevation data i can get is from a survey map.
i want to build my own DEM based on points with height value.
thats what i got (attachment) but how do i preform a valid viewshed analysis from that data, thats my real quastion, is there a video or a tutorail for this kind of analysis?
again thank you for your help.
danny