[jira] [Created] (SIS-542) Mercator auxiliary sphere

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

Martin Desruisseaux created SIS-542:
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             Summary: Mercator auxiliary sphere
                 Key: SIS-542
                 URL: https://issues.apache.org/jira/browse/SIS-542
             Project: Spatial Information Systems
          Issue Type: Sub-task
          Components: Referencing
            Reporter: Martin Desruisseaux
            Assignee: Martin Desruisseaux


This operation method is defined by ESRI:

https://desktop.arcgis.com/en/arcmap/latest/map/projections/mercator.htm

Of particular interest the meaning of "Auxiliary Sphere Type" parameter:

* 0 = use semimajor axis or radius of the geographic coordinate system
* 1 = use semiminor axis or radius
* 2 = calculate and use authalic radius
* 3 = use authalic radius and convert geodetic latitudes to authalic latitudes

Types 0 to 2 are easy, type 3 is more tricky and may not be supported in the first version. Type 0 is equivalent to "Popular Visualisation Pseudo Mercator" projection method.




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