EPW issues

[sunt05]

• [ ] epw conversion with the 'Prepare Existing Data' occasionally replaces the actual year with 1985

  (4) epw conversion with the 'Prepare Existing Data' occasionally replaces the actual year with 1985. Attached is a reference data that it occurs with. epwConversion.zip

Thanks for reporting this. I'll see how a fix can be made.

• [x] UMEP-dev/SuPy#75

  (5) epw file header not updated The header part of epw containing the geographical location, timezone, etc. is not updated, despite providing some of them in the gen_epw function. It is always the standard "LOCATION,Chongqing Shapingba,Chongqing,CHN,CSWD,575160,29.58,106.47,8,259.1 ..." The 'gen_epw' generated epw files are in the zipped result folders attached above at (2).

Please consider the EPW-related functionality as experimental and avoid using them in your "decent" research/work at the moment: please use with caution but feedbacks are more than welcome 🤝

Originally posted by @sunt05 in https://github.com/UMEP-dev/UMEP/issues/219#issuecomment-762165947

[tyhzxc]

information about epw file header EnergyPlus Weather File (EPW) Data Dictionary https://bigladdersoftware.com/epx/docs/8-3/auxiliary-programs/energyplus-weather-file-epw-data-dictionary.html

current header

    text_meta = """
LOCATION,Chongqing Shapingba,Chongqing,CHN,CSWD,575160,29.58,106.47,8,259.1
DESIGN CONDITIONS,0
TYPICAL/EXTREME PERIODS,0
GROUND TEMPERATURES,3,.5,,,,13.31,10.23,9.39,10.12,14.28,18.95,23.34,26.51,27.44,25.95,22.35,17.82,2,,,,16.09,13.20,11.82,11.77,13.97,17.16,20.59,23.54,25.06,24.77,22.74,19.63,4,,,,17.90,15.65,14.27,13.85,14.66,16.52,18.83,21.09,22.62,22.98,22.11,20.29
HOLIDAYS/DAYLIGHT SAVINGS,No,0,0,0
COMMENTS 1, generated by SuPy
COMMENTS 2, none
DATA PERIODS,1,1,Data,Sunday,1/1,12/31
    """

[biglimp]

I have missed this. The EWP files does not have continuous time steps as months are taken from different years. In order to make use of epw-files in e.g. SUEWS I just took on year (1985) as a base. If that is not appropriate, I can change so that the actual years in the EPW file is kept. Let me know how you would like it.

[sunt05]

@biglimp I'll handle this in the SuPy project: delayed for a while, sorry guys.

[biglimp]

Ok, but I override the year in https://github.com/UMEP-dev/UMEP/blob/SuPy-QGIS3/MetdataProcessor/metdata_processor.py#L259. Just let me know If I should keep this or not.

[sunt05]

that should be file: years have no effect in the actual calculations.