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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SIS-329) Transformation of envelope from UTM to WGS84 sometime wrongly expanded to the ±180° longitude range
Date Wed, 13 Jul 2016 08:26:20 GMT

     [ https://issues.apache.org/jira/browse/SIS-329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Desruisseaux updated SIS-329:
------------------------------------
    Fix Version/s:     (was: 0.8)
                   0.7.1

> Transformation of envelope from UTM to WGS84 sometime wrongly expanded to the ±180°
longitude range
> ---------------------------------------------------------------------------------------------------
>
>                 Key: SIS-329
>                 URL: https://issues.apache.org/jira/browse/SIS-329
>             Project: Spatial Information Systems
>          Issue Type: Bug
>          Components: Referencing
>    Affects Versions: 0.7
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>             Fix For: 0.7.1
>
>
> Consider the following envelope in UTM 30N (EPSG code 32630). Note that the longitude
range crosses the limit of the CRS domain of validity, which is -6° to 0°:
> {noformat}
> BOX(199980 4490220, 309780 4600020)
> {noformat}
> Transformation to WGS84 (EPSG code 4326) should give something close to:
> {noformat}
> BOX(-6.5941 40.5085, -5.2462 41.5292)
> {noformat}
> but we get:
> {noformat}
> BOX(-180 40.5085, +180 41.5292)
> {noformat}
> The longitude range (-6.6° to -5.2°) has been expanded to ±180°. This is because
the {{Envelopes.transform(…)}} method verifies if the given envelope contains a "singularity"
(typically a pole), and the ±180° longitude are wrongly identified as contained singularities
in this particular case.



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