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From "Martin Desruisseaux (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SIS-409) Take in account nested datum shift grids for smaller areas
Date Wed, 08 Jan 2020 09:38:01 GMT

    [ https://issues.apache.org/jira/browse/SIS-409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17010515#comment-17010515
] 

Martin Desruisseaux commented on SIS-409:
-----------------------------------------

Actually the assumption that the first grid is for a coutry-wide area is too optimistic. As
[reported on user mailing list|https://lists.apache.org/thread.html/r7d7e12be479e2cf3f194153354ef6a8996a9236c31f31aa2f8c27e1d%40%3Cuser.sis.apache.org%3E],
the {{NTv2_0.gsb}} datum shift grid file contains 114 grids for different areas of North America.

> Take in account nested datum shift grids for smaller areas
> ----------------------------------------------------------
>
>                 Key: SIS-409
>                 URL: https://issues.apache.org/jira/browse/SIS-409
>             Project: Spatial Information Systems
>          Issue Type: New Feature
>          Components: Referencing
>    Affects Versions: 0.8, 1.0
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Major
>             Fix For: 1.1
>
>
> Some datum shift grid files begin with a grid over a wide area, followed by smaller grids
over sub-area with a finer resolution. Current Apache SIS implementation use only the grid
in the wide area. We should take in account the grids with finer resolution when applicable.



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