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https://issues.apache.org/jira/browse/SIS-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525677#comment-17525677
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Martin Desruisseaux commented on SIS-542:
-----------------------------------------
This issue was initially reported on
[https://github.com/Geomatys/geotoolkit/issues/23].
> 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
> Priority: Major
>
> 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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