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Add support for point-based climatologies for use in SEEPS #1941

@RachelNorth

Description

@RachelNorth

Describe the New Feature

Some verification metrics require components from a pre-determined climatology in order to calculate the score.

In the specific case of calculating the Stable Equitable Error in Probability Space (SEEPS) it is necessary to use a climatology calculated at station locations to construct the score. MET #563 contains details of the point-based climatology from ECMWF for use specifically to calculate SEEPS (specifically #563 (comment)). These are in text file format, with each column representing a particular aspect of the required climatology.

However, this functionality could also be applicable more generally, and other use cases could conceivably contain the required point-based climatology within a netcdf file.

Acceptance Testing

ASCII text files or NetCDF anticipated as input.

Time Estimate

Unknown as yet.

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Relevant Deadlines

Part of Met Office contract, ending August 2022. MET v11.

Funding Source

Met Office contract

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