The calculation result of Area Solar Radiation is wrong, the values are approximated in a grid.

久米俊郎

I added the height of the building (raster) to the DEM to create a DSM.

 I input the DSM to Area solar radiation in Spatial Analyst and calculated the solar radiation, but the results were strange.
The values were approximated in a grid pattern.

 Incidentally, I used the default values for the parameters of Area solar radiation.
When I calculated only the height of the buildings, we did not see such a trend.

 If you have more information, please let me know!

 

 

久米俊郎

I checked again and found the same error when calculating solar radiation using only the DEM. This means that there was a problem with the DEM itself. I was using resample to match the cell size of the DEM to the cell size of the building raster, and the resampling_type of resample was NEAREST, which caused the problem. NEAREST is not suitable for continuous data. The problem was solved by using CUBIC, which is suitable for continuous data.