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by bernulli
1441 days ago
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Hi meteo-jeff, this looks really cool! I have two questions: 1) How does the spatial resolution come into this? Is it constant data all across the 2kmx2km (?) parcel with an abrupt change, or is it interpolated in some way? Can I query the coordinates of the mesh? 2) How 'historical' does it get? How far back can I go with this? Thank you! |
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1) Data are coming from multiple weather models. Primary data source is the German Weather service DWD with the ICON weather model. In my past experiences, the DWD ICON model performs best for many regions. DWD ICON has a global (~13 km), European (7 km) and a Central Europe (1-2 km) "domain". A higher resolution can improve forecast accuracy, but this is not guaranteed.
For Open-Meteo APIs, multiple models are mixed together. Typically high resolution domains only provide 3-5 days of forecast, afterwards they are combined with a global model.
For North American locations, I am going to add high resolution domains from NOAA as-well.
2) For now, only couple of months archive are available. There will be no limit of how much data can be stored. Data is fairly well compressed while still maintaining good read performance.
I am working on a long term archive as well. ECMWF provides a reanalysis dataset called ERA5 [1] with data from 1959. It will still take me a couple of weeks to process it. With 23 weather variables, it requires around 20 TB disk space (Gridded float32 with deflate compression).
[1] https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysi...