Can a single object be seen or not?
In this case the highest point of a fictitious Landfill Site.
grid of 'target' points at a specified grid interval, in this
example 25m, and height above the ground is used to determine
if the point on top of the landfill is visible. As can be
seen it is possible to include the effects of woodland and
built up areas. A
correction for earth curvature and refraction is optional.
shaded output indicates the visual intrusion of the point
analysed. It can be over displayed on top of the original
survey and/or orthophoto/raster map for a clearer picture
of which parts of the DTM are visible and which are invisible
from the pivot.