As recommended in https://github.com/cf-convention/cf-conventions/issues/222#issuecomment-569789956, I'm inquiring as to whether **EASE Grid North 25 km original** ([EPSG 3408](https://epsg.io/3408)) can be represented using grid_mapping attributes. My team generates hydrologic simulation model data for Arctic regions using that projection. I'd like to store data in CF netCDF, but I don't know if I'm doing it correctly. Like [Jim says](https://github.com/cf-convention/cf-conventions/issues/222#issuecomment-570276738), there's a good chance I botched it. In particular, there appears to be a number in the WKT related to the degree unit (0.0174532925199433), and I don't know if or how that should be represented in grid_mapping. Here's my attempt at a grid_mapping variable, which includes a crs_wkt attribute. How does it look?
```java int nsidc_ease_grid_north_25km; nsidc_ease_grid_north_25km:grid_mapping_name = "NSIDC_EASE_Grid_North"; nsidc_ease_grid_north_25km:longitude_of_projection_origin = 0.0; nsidc_ease_grid_north_25km:latitude_of_projection_origin = 90.0; nsidc_ease_grid_north_25km:false_easting = 0.0; nsidc_ease_grid_north_25km:false_northing = 0.0; nsidc_ease_grid_north_25km:geographic_crs_name = "GCS_Sphere_International_1924_Authalic"; nsidc_ease_grid_north_25km:horizontal_datum_name = "Not_specified_based_on_International_1924_Authalic_Sphere"; nsidc_ease_grid_north_25km:reference_ellipsoid_name = "International 1924 Authalic Sphere"; nsidc_ease_grid_north_25km:semi_major_axis = 6371228.0; nsidc_ease_grid_north_25km:inverse_flattening = 0.0; nsidc_ease_grid_north_25km:prime_meridian_name = "Greenwich"; nsidc_ease_grid_north_25km:longitude_of_prime_meridian = 0.0; nsidc_ease_grid_north_25km:projected_crs_name = "Lambert_Azimuthal_Equal_Area"; nsidc_ease_grid_north_25km:longitude_of_central_meridian = 0.0; nsidc_ease_grid_north_25km:crs_wkt = "PROJCS[\"NSIDC EASE-Grid North\",GEOGCS[\"Unspecified datum based upon the International 1924 Authalic Sphere\",DATUM[\"Not_specified_based_on_International_1924_Authalic_Sphere\",SPHEROID[\"International 1924 Authalic Sphere\",6371228,0,AUTHORITY[\"EPSG\",\"7057\"]],AUTHORITY[\"EPSG\",\"6053\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]], AUTHORITY[\"EPSG\",\"4053\"]],PROJECTION[\"Lambert_Azimuthal_Equal_Area\"], PARAMETER[\"latitude_of_center\",90],PARAMETER[\"longitude_of_center\",0], PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1, AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"X\",EAST],AXIS[\"Y\",NORTH],AUTHORITY[\"EPSG\",\"3408\"]]" ; ``` -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/cf-convention/cf-conventions/issues/278 This list forwards relevant notifications from Github. It is distinct from [email protected], although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to [email protected].
