feat: adding GOT5.5 and GOT download program

[tsutterley]

• refactor: renamed format for ATLAS to ATLAS-compact
• refactor: renamed format for netcdf to ATLAS-netcdf
• refactor: renamed format for FES to FES-netcdf and added FES-ascii
• refactor: renamed format for GOT to GOT-ascii and added GOT-netcdf
• feat: add JSON definition files for GOT5.5D and GOT5.6

[codecov]

Codecov Report

Attention: Patch coverage is 77.92683% with 362 lines in your changes missing coverage. Please review.

Project coverage is 69.36%. Comparing base (3d1d88a) to head (6c99005).

Files	Patch %	Lines
pyTMD/arguments.py	69.52%	268 Missing and 62 partials ⚠️
pyTMD/io/model.py	85.71%	6 Missing and 7 partials ⚠️
pyTMD/compute.py	33.33%	3 Missing and 3 partials ⚠️
test/test_arguments.py	98.80%	0 Missing and 5 partials ⚠️
pyTMD/check_points.py	50.00%	0 Missing and 2 partials ⚠️
pyTMD/io/constituents.py	83.33%	1 Missing and 1 partial ⚠️
pyTMD/io/GOT.py	50.00%	1 Missing ⚠️
pyTMD/io/OTIS.py	0.00%	1 Missing ⚠️
pyTMD/tools.py	0.00%	1 Missing ⚠️
test/test_atlas_read.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
+ Coverage   69.17%   69.36%   +0.18%     
==========================================
  Files          39       39              
  Lines        9365    10470    +1105     
  Branches     1322     1448     +126     
==========================================
+ Hits         6478     7262     +784     
- Misses       2467     2731     +264     
- Partials      420      477      +57     

Flag	Coverage Δ
unittests	69.36% <77.92%> (+0.18%)	⬆️

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[robbibt]

I didn't realise there were new versions of GOT available! Have you come across any documentation for them? I can see the files here but not really any extra details...
https://earth.gsfc.nasa.gov/geo/data/ocean-tide-models

[tsutterley]

Great question. I don't have on hand any additional documentation as I think Richard is writing it up. I know they are higher resolution and with more solved constituents. They have better treatment of some confounding effects (like atmospheric tides), and in the case of GOT5.6 include degree-3 components.

[robbibt]

Turns out there's a readme with a bit of extra info in the zip file - thanks @vnewey!

The ocean tide atlas available at this site, called GOT5.6, is
the latest solution in a series beginning with the work described in:

E J O Schrama and R Ray, Journal of Geophysical Research, v.99, p 24799, 1994.
and
R Ray, A global ocean tide model from Topex/Poseidon altimetry: GOT99.2,
   NASA Tech Memo 209478, 58 pages, Sept. 1999.
and
R Ray, Science Advances, 2020. DOI: 10.1126/sciadv.abd4744


GOT5.6 is a supplement to GOT5.5, which provides four additional
constituents, all generated by the third-degree terms of the astronomical
tide potential.  (It is considered a different "model" only because
some users have hard-coded the constituents of GOT5.5.)
You can combine the GOT5.5 and GOT5.6 files and call it GOT5.6.

The data for these four small constituents are defined only in the ±66°
latitude band covered by T/P and Jason altimetry (but tapered to
zero at higher latitudes).  Attempts to derive these tides from
non-T/P-J data have (so far) produced mostly noise.

The nomenclature here uses a prime(') to distinguish 3rd degree from
2nd degree tides. (The 2020 paper uses a leading "3" superscript.)
This isn't needed for M3, since there is no 2nd-deg M3 tide.

R D Ray, Goddard Space Flight Center                       July 2024
[email protected]