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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SIS-427) Improve CRS.suggestCommonTarget(…) by allowing to know Set<FunctionProperty>
Date Sat, 28 Jul 2018 10:12:00 GMT

     [ https://issues.apache.org/jira/browse/SIS-427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux updated SIS-427:
------------------------------------
    Summary: Improve CRS.suggestCommonTarget(…) by allowing to know Set<FunctionProperty>
 (was: Need a MathTransform.getFunctionProperties() method)

> Improve CRS.suggestCommonTarget(…) by allowing to know Set<FunctionProperty>
> ----------------------------------------------------------------------------
>
>                 Key: SIS-427
>                 URL: https://issues.apache.org/jira/browse/SIS-427
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>          Components: Referencing
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Major
>
> The Mollweide projection added by SIS-426 is not _surjective_: not all (_x_, _y_) values
can be mapped to a (_latitude_, _longitude_) values. Consequently current implementation of
{{CRS.suggestCommonTarget(…)}}, which is to suggest converting projected coordinates to
geographic coordinates, may not work for Mollweide. For that projection, it may be more reliable
to convert geographic coordinates to projected coordinates.
> For allowing {{CRS.suggestCommonTarget(…)}} to make a better choice, we need to know
more about the {{MathTransform}} properties. One approach would be to add a {{getFunctionProperties()}}
method which would return an {{Set<FunctionProperty>}}. This set can tell us if the
function is invertible, injective, surjective or bijective.



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