Enhance Stat-Analysis to compute the CBS score.

[dwfncar]

Describe the New Feature

The AF project needs to generate the CBS score on its GPP verification. This requires adding another method of interpolation (areal). Michelle Harrold has provided some code (from Bob Craig) and helpful references (see attachments).

From Bob:

"All, the attached document describes the CBS verification process , I.7-36 Table F. The verification is done over a 1.5 degree remap of the model using an area averaging technique. The ground truth is the model analysis. I have attached the program we use to average the data. The index based on the CBS score is from UKMO. I attached the program that calculates it along with the configuration files."

I have attached the WMO document with I.7-36 Table F as well as the the areal weighting IDL script (around line 251 is the weighting code) and the CBS score python program. Also, the areal weighting script references a paper, which might have some helpful background:

https://www.wmo.int/pages/prog/www/BAS/documents/AnnexDoc3-3.pdf

The work for this issue may include supporting a new interpolation method, computing the CBS score, and writing its output somewhere. Recommend coordinating with @michelleharrold since she's likely familiar with the details.

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[lisagoodrich]

If there are problems with these attachments, see original JIRA Location:
https://sdg.rap.ucar.edu/jira/browse/MET-1031?filter=12903

WMO_485_Vol_I.pdf
[area_averaging_grib2_cbs.pro.txt]

cbs_um_index_weights.txt

These files have been changed to txt files so they can be saved in this location.
(https://github.com/NCAR/MET/files/3292081/area_averaging_grib2_cbs.pro.txt)

cbs_scoresheet_test.py.txt

[JohnHalleyGotway]

Note that the changes for this task are included in PR #1892.