Area Solar Radiation tool of the Spatial analyst

Question

I'm working with the Area Solar Radiation tool of the Spatial analyst. I am using Lidar data for a part of Netherlands and am running the model for the whole year with monthly interval and I get highest insolation values for the month of November instead of July or August. I tried it a couple of times and also using a python script but still the same problem. Could anyone help me in explaining this?

bala_bhavyakausika · Answer

Sorry. The projection is RD New.

NeilAyres · Answer

Can find no reference to that in the ArcGIS documentation. Just something called RD New and RD Old.

So, is the DEM in metres (X, Y and Z).

What is the EPSG code for "Amersfoort_Double_Stereographic projection"

bala_bhavyakausika · Answer

Yes it is Projected. Amersfoort_Double_Stereographic projection.