I'm currently trying to do a viewshed (spatial analyst), using ArcGIS.
The datasets being used are observation/observer points located WITHIN buildings, and a DSM of the surrounding area and the buildings.
To force the observation points inside the buildings, i have set the SPOT attribute to values lower than the buildings themselves (i.e. the observer is placed on the floor inside the building, instead of the roof).
Running this analysis is not possible, since it gives me the following error:
ERROR 010067: Error in executing grid expression. No valid Observation points present.
Reading through an answer from another thread on this website, the error occurs because the SPOT value is lower than the input DSM value in the same location (Error in viewshed (arcgis)).
I was wondering if there are any smart solutions/workarounds that mean i dont have to place the observers on top of the buildings?