Hi John, hi all,
I know that for Topex/Poseidon and Jason-1/2 satellite data a specific
reference ellipsoid is used. If ESRI pick a sample of Jason data, as far as I
remember this reference ellipsoid is declared in the netCDF files. They can
retrieve these data on this FTP directory:
ftp://avisoftp.cnes.fr/AVISO/pub/jason-2/ssha_gdr_t/
Hope this helps.
Olivier.
-----Message d'origine-----
De : cf-metadata-bounces@xxxxxxxxxxxx [mailto:cf-metadata-bounces@xxxxxxxxxxxx]
De la part de John Caron
Envoyé : mardi 1 février 2011 20:40
À : cf-metadata@xxxxxxxxxxxx; Java NetCDF
Objet : [CF-metadata] ESRI implementation of ellipsoidal-earth
Apparently ESRI is willing to add support for CF 1.5 grid_mapping attributes
for ellipsoidal-earth/geodetic-datum definitions in the Grid Mappings and
Projections specification.
They are looking for sample data, especially using ellipsoidal parameters
(semi_major_axis/semi_minor_axis/inverse_flattening). Does anyone have any?
Also, they are wondering what to use for the default ellipsoid when these are
not specified. It seems to me the obvious candidates are 1) spherical earth
with a standard radius, or 2) WGS84 ellipsoid.
Opinions?
John
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