ERROR MESSAGE: 0.0 cannot be raised to a negative power

[divya42581]

Hey UMEP team,

I get the following error when I increase the grids in my study area, which includes some grids without buildings. It runs fine with 25 grids (adjacent to the present grids). I’ve attached the present data ( building, veg morphology, and land cover fraction) files with which I am getting the error.
Could you please help me with this? What can be the reason for this, and how can I solve this?

CRITICAL EXCEPTION IN C:\Users/2022CEZ8132/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\UMEP\SUEWSPrepare\prepare_worker.py,
LINE 455 "IMP_zd, IMP_z0 = rg.RoughnessCalc("Kan", zH, fai, pai, zMax, sdComb)"
ERROR MESSAGE: 0.0 cannot be raised to a negative power

Thank You.

SUEWS_data.zip

[biglimp]

This is probably since, in one of your grids, you have strange numbers for on of the inputs in the roughness calculation. It is hard to see which one as you only submitted the textfiles and not the actual data.

On another note, the tool you are using are about to be deprecated. You should use SUEWS Prapare DAtabase instead.

[divya42581]

@biglimp Thank you so much for your help and clarification. I understand.
Just for the information, I also use the Create Grid (QGIS) tool to create the grid polygons, as you mentioned. And I checked again, it creates a float dtype ID.

[biglimp]

Not my version (3.42)

[divya42581]

Okay, thank you. I am using QGIS version: 3.40.8-Bratislava.
For the temporary grid vector layer, it is integer, but if I save the layer to .shp it changes to float.

[divya42581]

@biglimp, I am getting the following Python error while running the SUEWS Prepare Database. Could you please help me with this?

WARNING Traceback (most recent call last):
File "C:\Users/2022CEZ8132/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\UMEP\suews_prepare_database\suews_prepare_database.py", line 753, in generate
self.generateSiteSelect(settings_dict)
File "C:\Users/2022CEZ8132/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\UMEP\suews_prepare_database\suews_prepare_database.py", line 997, in generateSiteSelect
df_build_frac = df_build_frac.set_index('ID') # Set ID as index in df to be able to slice in df
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\PROGRA1\QGIS341.8\apps\Python312\Lib\site-packages\pandas\core\frame.py", line 6122, in set_index
raise KeyError(f"None of {missing} are in the columns")
KeyError: "None of ['ID'] are in the columns"

[biglimp]

We are doing update in this tool at the moment. Please wait until new development release is available.