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

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

    [ https://issues.apache.org/jira/browse/SIS-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525677#comment-17525677 ] 

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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