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https://issues.apache.org/jira/browse/SIS-557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17585402#comment-17585402
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Michael Arneson commented on SIS-557:
-------------------------------------

I have added a test file that can be used to test this issue.

> Complex polynomial of degree 4 (EPSG:9653)
> ------------------------------------------
>
>                 Key: SIS-557
>                 URL: https://issues.apache.org/jira/browse/SIS-557
>             Project: Spatial Information Systems
>          Issue Type: Sub-task
>          Components: Referencing
>            Reporter: Martin Desruisseaux
>            Priority: Major
>         Attachments: Convert_EPSG_28992_to_EPSG_23031.java
>
>
> This is presented in EPSG guidance note as a more elegant way to do 
> polynomial regression. Used for example in Amersfoort / RD system to ED50 / 
> UTM.
> See §4.6.2 in IOGP Publication 373-7-2 – Geomatics Guidance Note number 7, 
> part 2 – May 2022.



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