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https://issues.apache.org/jira/browse/SIS-572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-572:
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Issue Type: Bug (was: Task)
> Assign GeoTIFF projection 15 to Polar Stereographic variant B instead of A
> --------------------------------------------------------------------------
>
> Key: SIS-572
> URL: https://issues.apache.org/jira/browse/SIS-572
> Project: Spatial Information Systems
> Issue Type: Bug
> Components: Referencing
> Affects Versions: 0.6, 0.7, 0.8, 1.0, 1.1, 1.2, 1.3
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Major
> Fix For: 1.4
>
>
> The GeoTIFF projection #15 ({{CT_PolarStereographic}}) is currently mapped to
> operation method EPSG::9810 (_Polar Stereographic *variant A*_) because this
> is what the
> [geotiff.maptools.org|http://geotiff.maptools.org/proj_list/polar_stereographic.html]
> does. But it seems to be an error. It should be mapped to EPSG::9829 (_Polar
> Stereographic *variant B*_) instead.
> This change is based on the observation that existing GeoTIFF files use the
> _Latitude of natural origin_ (GeoTIFF::3081) parameter with values such as
> 70°N, which is illegal for projection variant A. They probably mean _Latitude
> of standard parallel_ (GeoTIFF::3078) instead, which is a parameter of
> variant B. This problem is described in more details in [GeoTIFF GitHub issue
> #110|https://github.com/opengeospatial/geotiff/issues/110].
> We may need to add a hack for remapping the _Latitude of natural origin_
> parameter to _Latitude of standard parallel_ when the Polar Stereographic
> projection is used in a GeoTIFF file, in order to accept legacy (erroneous)
> data.
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