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

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10-30-2021 08:58 AM
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久米俊郎
New Contributor II

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

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 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.

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 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.

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 If you have more information, please let me know!

 

 

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久米俊郎
New Contributor II

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.

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SteveLynch
Esri Regular Contributor

When you added the height raster:

- does it have the same cellsize as the DEM?

- and the same spatial reference?

- did you set SnapRaster=DEM when you added?

久米俊郎
New Contributor II

Thanks for the advice!

 does it have the same cellsize as the DEM?-Yes

- and the same spatial reference?-Yes

- did you set SnapRaster=DEM when you added?-I used the raster calculator, but I could not set snap raster there.

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久米俊郎
New Contributor II

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.

キャプチffャ.PNG

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