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  1. Browse the ERA-Interim data catalogue for the data you are interested in, and in the last step make a selection in all boxes and click 'View the MARS request'. This shows a template Python script with your selected options.
  2. Copy the Python script to a text file and save it, for example as 'my_ERA-Interim_script_v1.py'
  3. If necessary, adapt the Python script to your requirements,e.g. change date, time and grid.
    1. For an output in netcdf format, specify "format" as "netcdf"
    2. If you specify "format" as "netcdf", then you also need to set "grid" e.g. "grid": "0.3/0.3". Otherwise, GRIB to netCDF conversion will fail.  
    3. If you specify "grid", the horizontal resolution is in decimal degrees. If not set, the archived grid as specified in the data documentation is used i.e. reduced Gaussian grid
    4. To subset to a geographical area, specify "area" asN/W/S/E in geographic lat/long degrees. Southern latitudes and western longitudes must be given as negative numbers e.g. "area": "75/-20/10/60". Requires "grid" to be set to a regular grid e.g. "grid": "0.3/0.3".

    5. Change the "target": "CHANGEME", to the desired output path and file name, e.g. "data1.nc" or "./data/data1.grib". The default path is the current working directory.

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