ICON Forecast data

[alexander-petkov]

Add ICON forecast model data to Geoserver Source: https://www.dwd.de/EN/ourservices/nwp_forecast_data/nwp_forecast_data.html

We need the global icon data, from this link: https://opendata.dwd.de/weather/nwp/icon/

[alexander-petkov]

Trasnforming data

To transform the data from the original triangular grid to lat/lon coordinate based grid (0.125x0.125), follow the instructions in Sec 2.4: https://www.dwd.de/DE/leistungen/opendata/help/modelle/Opendata_cdo_EN.pdf?__blob=publicationFile&v=3

1. Download necessary files (we chose 0.125 deg resolution) https://opendata.dwd.de/weather/lib/cdo/ICON_GLOBAL2WORLD_0125_EASY.tar.bz2 https://opendata.dwd.de/weather/lib/cdo/icon_grid_0026_R03B07_G.nc.bz2

2. After extracting the downloaded archives, transform data with cdo:

   cdo -f grb2 remap,${TARGET_GRID_DESCRIPTION},${WEIGHTS_FILE} ${input_file} ${output_file}

   NOTE: The GLOBAL2WORLD archive contains the weight nc file, and is not necessary to generate it as described in the documentation. The output file is in lat/lon, in our case at 0.125x0.125 resolution.

Example of the transformation:

[alexander-petkov]

Reference documentation: https://www.dwd.de/DWD/forschung/nwv/fepub/icon_database_main.pdf

[alexander-petkov]

Datasets:

1. Temperature: t_2m Temperature at 2m above ground (K)
2. Relative Humidity: relhum_2m Relative humidity at 2m above ground (%)
3. Cloud cover: clc Cloud cover (%)
4. Solar Radiation: ASWDIR_S Surface down solar direct radiation(average since model start) (Wm-2)
5. Wind: u_10m Zonal wind at 10m above ground (m s−1) v_10m Meridional wind at 10m above ground (m s−1) Looks like Wind speed and direction are to be calculated.
6. Total Precipitation: tot_prec Total precipitation (accumulated since model start) (kg/m-2)

[wmjolly]

Is Total Precipitation also included?

On Mon, Sep 20, 2021 at 12:08 PM alexander-petkov @.***> wrote:

Datasets:

1. Temperature: t_2m Temperature at 2m above ground (K)
2. Relative Humidity: relhum_2m Relative humidity at 2m above ground (%)
3. Cloud cover: clc Cloud cover (%)
4. Solar Radiation: ASWDIR_S Surface down solar direct radiation(average since model start) (Wm-2)
5. Wind: u_10m Zonal wind at 10m above ground (m s−1) v_10m Meridional wind at 10m above ground (m s−1) Looks like Wind speed and direction are to be calculated.

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[alexander-petkov]

Is Total Precipitation also included?

Thanks for catching this, I will amend the comment with the variables. TOT_PREC4 Total precipitation (accumulated since model start)

[wmjolly]

Can we make sure Precipitation is calculated per forecast period and not as an accumulation? It's so much easier to use that way. I think you had to do the same thing for GFS.

On Tue, Sep 21, 2021 at 11:37 AM alexander-petkov @.***> wrote:

Is Total Precipitation also included? Thanks for catching this, I will amend the comment with the variables. TOT_PREC4 Total precipitation (accumulated since model start)

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[alexander-petkov]

Can we make sure Precipitation is calculated per forecast period and not as an accumulation? It's so much easier to use that way. I think you had to do the same thing for GFS.

Yes, we will have to derive hourly or 3-hour accumulation.

[wmjolly]

Hourly accumulated would be ideal

On Tue, Sep 21, 2021, 17:28 alexander-petkov @.***> wrote:

Can we make sure Precipitation is calculated per forecast period and not as an accumulation? It's so much easier to use that way. I think you had to do the same thing for GFS.

Yes, we will have to derive hourly or 3-hour accumulation.

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[alexander-petkov]

ICON datasets are configured, now I just have to test the update. Also to check the units.

[wmjolly]

So awesome! Thanks

On Thu, Sep 23, 2021, 20:52 alexander-petkov @.***> wrote:

ICON datasets are configured, now I just have to test the update. Also to check the units. [image: Screenshot from 2021-09-23 20-50-41] https://user-images.githubusercontent.com/39599557/134610952-8ed0a66c-d53a-498c-a6c8-8e3693d6373e.png

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