[
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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
