Describe the New Feature

The Stable Equitable Error in Probability Space (SEEPS) score is described in Rodwell et al. (2010) and was devised for evaluating quantitative precipitation forecasts against SYNOP gauge data at (but not limited to) station locations. It uses a climatology to account for local variations in rainfall which enables aggregation over otherwise heterogenous locations. Recent work (North et al., 2021) has used a gridded product for calculating the score over both land and sea areas.

This issue will act as an umbrella ticket for the implementation of the gridded score capability.

• MET Enhance Point-Stat to compute SEEPS for point observations and write new SEEPS and SEEPS_MPR STAT line types. #1942 added SEEPS to Point-Stat.
• MET Enhance Series-Analysis to compute statistics from the SEEPS STAT line type. #2269 will add it to Series-Analysis after this one is completed.

While Point-Stat writes the SEEPS and SEEPS_MPR line types, Grid-Stat should only write the SEEPS line type. However, recommend also adding support for:

nc_pairs_flag = {
...
    seeps = TRUE;
...
}

There setting the nc_pairs_flag.seeps setting enables some output to be written to the "_pairs.nc" file created by Grid-Stat. At a minimum, it should write the seeps value for each grid point.

Please talk to @RachelNorth to determine if any other columns from the SEEPS_MPR line type should also be written to the "_pairs.nc" NetCDF file.

We do still need to define the columns that should be included in a new SEEPS line type.
MET #1942 left the S12 through PV3 columns set as NA. Work for this issue should actually define their contents.

Acceptance Testing

List input data types and sources.
Describe tests required for new functionality.

Time Estimate

Estimate the amount of work required here.
Unknown

Sub-Issues

Consider breaking the new feature down into sub-issues.

• Add a checkbox for each sub-issue here.

Relevant Deadlines

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

Funding Source

2799991

Define the Metadata

Assignee

• Select engineer(s) or no engineer required: @hsoh-u
• Select scientist(s) or no scientist required: @RachelNorth

Labels

• Select component(s)
• Select priority medium-to-high
• Select requestor(s) UK Met Office

Projects and Milestone

• Select Repository and/or Organization level Project(s) or add alert: NEED PROJECT ASSIGNMENT label
• Select Milestone as the next official version or Future Versions

Define Related Issue(s)

Consider the impact to the other METplus components.

• METplus, MET, METdatadb, METviewer, METexpress, METcalcpy, METplotpy
• Need METplus issue to add output_flag.seeps and nc_pairs_flag.seeps as configurable options.

New Feature Checklist

See the METplus Workflow for details.

• Complete the issue definition above, including the Time Estimate and Funding source.
• Fork this repository or create a branch of develop.
  Branch name: feature_<Issue Number>_<Description>
• Complete the development and test your changes.
• Add/update log messages for easier debugging.
• Add/update unit tests.
• Add/update documentation.
• Push local changes to GitHub.
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  Pull request: feature <Issue Number> <Description>
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  Select: Reviewer(s) and Linked issues
  Select: Repository level development cycle Project for the next official release
  Select: Milestone as the next official version
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• Close this issue.