The IFS data available through the ECMWF open data store is degraded to 0.25 deg resolution - what interpolation method is being used to regrid the data to the quarter-degree grid?
I am asking so that we can replicate the same regridding for the IFS reforecasts from MARS that is used in open data.
Hi Andre,
Under the hood both MARS and dissemination system use MIR software for the interpolation.
The interpolation method will depend on the parameter.
If you are a Python user Earthkit regrid package ( earthkit-geo latest documentation ) also uses MIR for the interpolation under the hood.
When you download the data from MARS, if you add parameter grid = 0.25/0.25 and use global area you should get the same data.
I hope this helps.
Milana