I am trying to understand the viewshed and observer points tool
in spatial analyst. I want to show which areas of land can see a
wind turbine, or put another way, from where can the wind
turbine be seen! In my simplified model I have just the DEM and
a point shp which contains the following fields: OFFSETA and
OFFSETB. I have read the ESRI Documention and OFFSETA is the
height of the observer over the DEM and OFFSETB is a height of
an object over the DEM. If I calculate the viewshed as follows:
OFFSETA= 1.65 (Eye-level) and OFFSETB = 50 (the top of the
windturbine) what am I actually calculating? Could it be all
cells which the observer (at a height of 1.65m above the DEM)
would observe if a 50m tall wind turbine would stand in every
cell???? in other words... these are the cells in which a 50m
tall wind turbine could be seen from the observation point?
Because I want to know from where the turbine is visible, I
thought I should put the observer´s eye-level on top of the wind
turbine (50m). Now I can just cal