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https://issues.apache.org/jira/browse/SIS-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17484412#comment-17484412
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Martin Desruisseaux commented on SIS-533:
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h1. Comparison with UCAR netCDF library
The south pole case is consistent with
{{ucar.unidata.geoloc.projection.RotatedLatLon}} in UCAR netCDF library. But
for the north pole case, {{ucar.unidata.geoloc.projection.RotatedPole}} in UCAR
netCDF library version 5.5.2 gives results with an offset of 180° in longitude
values compared to our implementation. But geometrical reasoning suggests that
our implementation is correct: if we rotate the pole to 60°N, then latitude of
54°N on Greenwich meridian become only 6° below new pole, i.e. 84°N but still
on the same meridian (Greenwich) because we did not cross the pole.
> Add "Rotated Latitude/Longitude" coordinate operation
> -----------------------------------------------------
>
> Key: SIS-533
> URL: https://issues.apache.org/jira/browse/SIS-533
> Project: Spatial Information Systems
> Issue Type: New Feature
> Components: Referencing
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Major
> Fix For: 1.2
>
>
> Add the "Rotated Latitude/Longitude" coordinate operation as described by the
> World Meteorological Organization (WMO) in GRIB2 template 3.1. This
> coordinate operation has no EPSG code (at the time of writing this issue).
> In the UCAR netCDF library, this is named {{"rotated_latlon_grib"}} with the
> following parameters:
> * {{"grid_south_pole_latitude"}}
> * {{"grid_south_pole_longitude"}}
> * {{"grid_south_pole_angle"}}
> Note that UCAR also defines a north pole variant named
> {{"rotated_latitude_longitude"}} with the following parameters:
> * {{"grid_north_pole_latitude"}}
> * {{"grid_north_pole_longitude"}}
> * {{"north_pole_grid_longitude"}}
> I didn't found WMO names for parameters. In absence if alternatives, Apache
> SIS currently uses the netCDF parameter names. Those names seem to be used by
> the PROJ library as well.
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