UMEP - Pre-Processor - Wall height

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Original report by Karoline Walal (Bitbucket: Karoline90, ).

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Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas).

I suspect that the reason for this has to do with the wall height, which has been calculated with the UMEP Pre-processor for "wall height and aspect". All raster files used in the calculation show the exact same pixel position for the buildings (gray pixels in the picture) except the wall height (white pixels in the picture).

According to the UMEP webpage (https://umep-docs.readthedocs.io/en/latest/pre-processor/Urban%20Geometry%20Wall%20Height%20and%20Aspect.html) the "Wall pixels will be located ‘inside’ of the building footprint." for the wall height. In my project however, the wall height pixels have been set outside of the building (white pixels in the picture). This is the only way I personally can explain the cold edges around the buildings .

Could someone help me with this problem?

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Original comment by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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You have found an error in the manual. The walls are located outside of the buildings. I will change this in the manual. Regarding you cold areas next to building walls I would need more information. Please attach RunInfoSOLWEIG.txt.

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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Original comment by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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I think I need to see your input data. Please attach your DSM and landcover grid as well as your metfile. What version of UMEP are you using?

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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I am using UMEP Version 1.5

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Original comment by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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How do you estimate positions of building, did you use your DEM or did you take it from your land cover grid? Your DEM heights is not corresponding to your DSM ground heights.

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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I created the DSM using the "DSM Generator". Here I used the DEM and a shape file including the building height.

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Original comment by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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It looks like you have not ticked in "Estimate diffuse and direct shortwave radiation from global radiation". This must be ticked in as you have only zeros in your metfile. Also, your CDSM includes grass surfaces. This data should only include high vegetation above e.g. 2m. Grass is represented in the land cover grid. Please re-run and let us know your results. /Fredrik

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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Great, thanks! I will try to re-run tomorrow and let you know about the outcomes. Thanks a lot for the help!

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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Hei Fredrik. Unfortunately now I get very strange peaks when I look at the Mean Radiant Temperature of the POI`s. Do you maybe know what is causing them?

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Original comment by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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Did you "fix" your CDSM?. Please attach the POI file.

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Original comment by Karoline Walal (Bitbucket: Karoline90, ).

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Everything is working as it should be now. I just forgot to create the Sky View Factor with the new vegetation. I am very thankful for your constant support Fredrik! Thanks a lot!

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Original comment by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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I will now close this issue. Good luck with your work.

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Original changes by Karoline Walal (Bitbucket: Karoline90, ).

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changed content from "Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas). ![2.jpg](https://bitbucket.org/repo/866jAG/images/231704019" to "Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas). ![2.jpg](https://bitbucket.org/repo/866jAG/images/231704019"

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Original changes by Karoline Walal (Bitbucket: Karoline90, ).

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changed content from "Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas). ![2.jpg](https://bitbucket.org/repo/866jAG/images/231704019" to "Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas). ![2.jpg](https://bitbucket.org/repo/866jAG/images/231704019"

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Original changes by Karoline Walal (Bitbucket: Karoline90, ).

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changed content from "Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas). ![2.jpg](https://bitbucket.org/repo/866jAG/images/231704019" to "Hello, I have an issue with my Solweig Outcomes for the Tmrt output maps. It is visible in the output map, that the areas around the buildings show lower teperatures than the rest (blue areas). ![2.jpg](https://bitbucket.org/repo/866jAG/images/231704019"

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Original changes by Karoline Walal (Bitbucket: Karoline90, ).

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set attachment to "RunInfoSOLWEIG.txt"

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Original changes by Karoline Walal (Bitbucket: Karoline90, ).

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set attachment to "Project_KW.zip"

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Original changes by Fredrik Lindberg (Bitbucket: fredrik_ucg, ).

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changed state from "new" to "resolved"