Cambridge-ICCS/xgcm-sgrid

Team repository for xgcm-sgrid

Helpful links

• https://web.archive.org/web/20160417032300/http://pycomodo.forge.imag.fr/norm.html
• https://xgcm.readthedocs.io/en/latest/grids.html
• https://sgrid.github.io/sgrid/
• https://github.com/xgcm/xgcm

XGCM discussions on SGRID:

• xgcm/xgcm#109

Sample S-Grid Data Sources

• https://dataverse.nl/dataset.xhtml?persistentId=doi:10.34894/YKM4LQ
• https://drive.google.com/file/d/1MH1b5vt3Cu-Hg0I2tdGUA3CxiLU3T9Za/view?usp=sharing
• https://opendap.deltares.nl/thredds/catalog/opendap/deltares/Delft3D/netcdf_example_files/catalog.html?dataset=varopendap/deltares/Delft3D/netcdf_example_files/trim-westernscheldt_sph.nc

Presentation_Link:

• https://docs.google.com/presentation/d/1x4ByiXqMt4rJad7_9PtQTOOqI9Z8LUYJ/edit?usp=sharing&ouid=115980978354018671087&rtpof=true&sd=true

Pseudocode & discussion

Analysing grid.face_dimensions

• List of FACE_NAME: NODE_NAME (padding: PADDING)
• Each entry becomes an axis in xGCM

e.g.

node_dimensions: MC NC
face_dimensions: M:MC (padding: low) N:NC (padding: low)

Mapping SGRID padding to position

Given that SGRID face centre corresponds to an xGCM cell centre:

• none -> outer
• both -> inner
• low -> right
• high -> left

Compare:

• https://sgrid.github.io/sgrid/#2d-grid
• https://xgcm.readthedocs.io/en/latest/grids.html#axes-and-positions