Timeline for What CRS does GFS use?
Current License: CC BY-SA 4.0
8 events
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| Jun 26, 2020 at 21:29 | comment | added | Lance Berc | @BarocliniCplusplus I see what you mean. But since I'm using pyproj.Transformer.from_crs() to transform Lon/Lat to x/y it wants a source CRS; Plate Carrée seems to be a good choice. Thank you. | |
| Jun 26, 2020 at 21:24 | vote | accept | Lance Berc | ||
| Jun 26, 2020 at 19:15 | comment | added | BarocliniCplusplus | @LanceBerc If that is what you want, sure. But the choice of projection is moot. A CRS tries to project a field on a sphere as if it were on a geometrical object, say a cylinder. The projection of the map matters if the model has a projection. But since the GFS doesn't have a projection, then really no projection matters. It is entirely your choice. All of this to say, for the GFS, your choice in map will only alter what the map looks like, not how the data looks on the map. | |
| Jun 26, 2020 at 18:37 | comment | added | Lance Berc |
@BaroncliniCplussplus So my Proj string should be "+proj='eqc' +R=6371229" where eqc is Equidistant Cylindrical (Plate Carrée) and R is the radius of the sphere (the given a and b, the major and minor axis of the underlying ellipse, are equal)?
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| Jun 26, 2020 at 7:55 | history | edited | user1066 | CC BY-SA 4.0 |
added 9 characters in body
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| Jun 25, 2020 at 17:57 | comment | added | BarocliniCplusplus | @gansub Yes, but a spectral model just describes how a model is solved, not necessarily the CRS of the model. Although it is easier to on a global latitude/longitude grid, there are a few regional spectral models, such as the RSM or ALADIN which use Fourier and/or Legendre transforms. The latter of those models, for example, uses a Mercator or Lambert Conformal projection (umr-cnrm.fr/gmapdoc/IMG/pdf/ykarpbasics46t1r1.pdf) | |
| Jun 25, 2020 at 1:26 | comment | added | user1066 | @BaroclinicCplusplus Isn't GFS a spectral model ? | |
| Jun 24, 2020 at 20:03 | history | answered | BarocliniCplusplus | CC BY-SA 4.0 |