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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SIS-284) Geographic2D with Height Offsets (EPSG:9618)
Date Fri, 07 Apr 2017 16:43:41 GMT

    [ https://issues.apache.org/jira/browse/SIS-284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15961091#comment-15961091
] 

Martin Desruisseaux commented on SIS-284:
-----------------------------------------

Before to close this task, we need to verify that we can decode all the following coordinate
operations:

{code:java}
public class Test {
    public static void main(String[] args) throws Exception {
        CoordinateOperationAuthorityFactory factory = (CoordinateOperationAuthorityFactory)
CRS.getAuthorityFactory("EPSG");
        System.out.println(factory.createCoordinateOperation("15596"));     // 3D to 3D
        System.out.println(factory.createCoordinateOperation("1336"));      // 3D to 2D
        System.out.println(factory.createCoordinateOperation("1335"));      // 2D to 2D
    }
}
{code}

With EPSG geodetic data set 8.9, the first coordinate operation succeed but the next two fails,
because the operation method is declared with a {{null}} (meaning arbitrary) source number
of dimensions, which is okay, but a target number of dimensions fixed to 3. If the situation
is the same in EPSG geodetic dataset 9.0, we may need to force the target dimension to null.

> Geographic2D with Height Offsets (EPSG:9618)
> --------------------------------------------
>
>                 Key: SIS-284
>                 URL: https://issues.apache.org/jira/browse/SIS-284
>             Project: Spatial Information Systems
>          Issue Type: Sub-task
>          Components: Referencing
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Minor
>             Fix For: 0.8
>
>
> Simplified form of _"Geographic3D to Geographic2D + gravity-related height"_ transformation
used in Japan.
> See §2.4.5.3 in IOGP Publication 373-7-2 – Geomatics Guidance Note number 7, part
2 – April 2015.



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