Page Comparison

See also CAM-FV Grid Overview and ATM Grid Resolution Summary

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1. TempestRemap:  https://github.com/ClimateGlobalChange/tempestremap.   
   1. Used to make Exodus files (GLL and physgrid) and to make SCRIP files (physgrid only).
   2. Used to make mapping files for GLL grids directly from the Exodus file.
2. Obsolete:  For quasi-uniform cubed-sphere grids, E3SM currently uses the "pentagons" option to construct the dual grid for making ESMF mapping files.  To create these meta data grid files,  we use a utility distributed with the E3SM code - see e3sm/components/homme/test/tool.
3. Obsolete:  For RRM grids, E3SM v1 used the "cheveron" option to construct the dual grid for making ESMF mapping files.  To create these meta data grid files we use a Matlab program that performs a Newton interation.  This matlab code is in the E3SM PreAndPostProcessingScripts repo under regridding/spectral_elements_grid_utilities/

Using TempestRemap to create Exodus and SCRIP files: 

1. To create the Exodus file.  For cubed sphere grids with a resolution of "NE":  
   1. GenerateCSMesh --alt --res $NE --file ne${NE}.g
   2. For RRM grids, the Exodus .g file is part of the model configuration and is stored along with the initial condition files in the E3SM input data server, inputdata/atm/cam/inic/homme
2. To create a SCRIP file for PG2 grids from the Exodus file:
   1. GenerateVolumetricMesh --in ne${NE}.g --out ne${NE}pg2.g --np 2 --uniform 2
   2. ConvertExodusToSCRIP ConvertMeshToSCRIP --in ne${NE}pg2.g  --out ne${NE}pg2.scrip.nc
3. For E3SM V2, the physics is running on the "PG2" grid.  This means most output, and all coupled model mapping files need to work with PG2 grids.   
   1. Mapping files should be created using the SCRIP file 

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