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https://issues.apache.org/jira/browse/SIS-597?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux resolved SIS-597.
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    Resolution: Fixed

> Remove usages of Projection sub-interfaces
> ------------------------------------------
>
>                 Key: SIS-597
>                 URL: https://issues.apache.org/jira/browse/SIS-597
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>          Components: Referencing
>    Affects Versions: 1.4
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Major
>             Fix For: 1.5
>
>
> Drop the implementations of {{PlanarProjection}}, {{CylindricalProjection}} 
> and {{ConicProjection}} sub-interfaces. Those interfaces were never part of 
> any OGC or ISO standards. They were added 20 years ago in GeoAPI at the 
> request of users who wanted a classification of map projections. But many 
> classifications exist (based on "conformal" or "equal area" characteristics), 
> and the use of a classification based on "conic", "cylindrical", _etc._ is 
> arbitrary. We are not aware of code for which those GeoAPI interfaces are 
> important.
> This cleaning is part of SIS-592: upgrade to ISO 19111:2019. We try to be 
> closer to the standard. Note that the removal of those interfaces do not 
> impact the Apache SIS capability to perform map projections. They are just 
> not classified anymore as "planar", "conic" or "cylindrical".



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