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Much of the data provided by the Copernicus Atmosphere Monitoring Service (CAMS), the Copernicus Climate Change Service (C3S), and by meteorological centres like ECMWF comes in GRIB or NetCDF format.

In this example we work with the ERA5 dataset, hourly surface pressure (sp) for the month 2010-08, in GRIB and or NetCDF format, as specified in this data retrieval CDS API script:

Code Block

language	py
collapse	true

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
serverimport cdsapi

c = ECMWFDataServercdsapi.Client()

serverc.retrieve(
    'reanalysis-era5-single-levels',
    {
    "class": "ea",
    'product_type':'reanalysis',
        'variable':'surface_pressure',
        "dataset": "era5",
'year':'2010',
        'month':'08',
     "date": "2010-08-01/to/2010-08-31",
    "expver": "1",
    "levtype": "sfc",
    "param": "134.128",
    "stream": "oper",
    "time": "00/to/23/by/1",
    "type": "an",
      'day':[
            '01','02','03',
            '04','05','06',
            '07','08','09',
            '10','11','12',
            '13','14','15',
            '16','17','18',
            '19','20','21',
            '22','23','24',
            '25','26','27',
            '28','29','30',
            '31'
        ],
        'time':[
            '00:00','01:00','02:00',
            '03:00','04:00','05:00',
            '06:00','07:00','08:00',
            '09:00','10:00','11:00',
            '12:00','13:00','14:00',
            '15:00','16:00','17:00',
            '18:00','19:00','20:00',
            '21:00','22:00','23:00'
        ]
 # ----- For GRIB version, specify format targetand file name ------ 

         "target": "'format':'grib',
    },
    'e5-sp-201008xx.grib",
    ')

# ----- For NetCDF version, specify grid, format and target file name ------ 

    "grid": "0.5/0.5",
    "'format"': "'netcdf"',
     "target": "},
    'e5-sp-201008xx.nc",
 })')

This script retrives a GRIB file 'e5-sp-201008xx.grib' and or a NetCDF file 'e5-sp-201008xx.nc'.

See also: How to download ERA5 data via the ECMWF Web API

Looking up data values in GRIB

...

The results from the GRIB and NetCDF versions are slightly different, because the GRIB data is in the original grid and resolution, whil eteh while the NetCDF data was regridded interpolated

...

.

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_{This document has been produced in the context of the Copernicus Atmosphere Monitoring Service (CAMS) and Copernicus Climate Change Service (C3S).}

_{The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of CAMS and C3S on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose.}

_{The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view.}

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Looking up data values in GRIB

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