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https://issues.apache.org/jira/browse/SIS-445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-445:
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Issue Type: Improvement (was: Task)
> NetCDF store should be robust to localization grid crossing anti-meridian
> -------------------------------------------------------------------------
>
> Key: SIS-445
> URL: https://issues.apache.org/jira/browse/SIS-445
> Project: Spatial Information Systems
> Issue Type: Improvement
> Components: Referencing, Storage
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Major
> Fix For: 1.0
>
>
> NetCDF files often have a "longitude" and "latitude" variables (names may
> vary) containing longitude and latitude values of every pixels. For raster
> data in Pacific ocean, the range of longitude sometime cross the
> anti-meridian, where longitude values suddenly drop from +180° to -180°. This
> discontinuity breaks our attempt to compute an affine transform approximation
> in {{LocalizationGridBuilder}}, produces wrong results when interpolating
> values in this area of the grid, and makes more difficult to converge when
> performing an inverse transformation.
> The proposed fix is to detect when such discontinuity happens, and add or
> subtract 360° on one side in order to get continuous values. Inconvenient is
> that some values become outside the [-180 … 180] range. In some case it can
> be outside the [0 … 360] range too (i.e. the data may turn around the Earth
> more than one lap).
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