[jira] [Assigned] (SIS-572) Assign GeoTIFF projection 15 to Polar Stereographic variant B instead of A

["Martin Desruisseaux (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SIS-572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Desruisseaux reassigned SIS-572:
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> 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: Task
>          Components: Referencing
>    Affects Versions: 1.3., 1.2, 1.1, 1.0, 0.8, 0.7, 0.6
>            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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