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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SIS-117) Allow definition of custom CRS by properties files
Date Mon, 21 May 2018 15:08:00 GMT

    [ https://issues.apache.org/jira/browse/SIS-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16482599#comment-16482599
] 

Martin Desruisseaux commented on SIS-117:
-----------------------------------------

Another source to take in account is the ESRI database: https://github.com/Esri/projection-engine-db-doc/

> Allow definition of custom CRS by properties files
> --------------------------------------------------
>
>                 Key: SIS-117
>                 URL: https://issues.apache.org/jira/browse/SIS-117
>             Project: Spatial Information Systems
>          Issue Type: New Feature
>          Components: Referencing
>            Reporter: Martin Desruisseaux
>            Priority: Minor
>
> Coordinate Reference System (CRS) definitions will be provided by the EPSG database.
However we need an easy for allowing users to provide their own CRS, because updating the
EPSG database is uneasy. One of the easiest way is to provide a list of CRS as plain _key_
- _value_ pair, where the _key_ is the code and the _value_ is the CRS in WKT (Well Known
Text) format. Such pairs can be provided in two ways:
> * As {{*.properties}} files
> * In the PostGIS {{spatial_refsys}} table.
> This issue is only about properties files.
> The above CRS codes are valid only in a namespace. The easiest way to specify the namespace
would be to use the name of the properties file. So a {{“custom.properties”}} file might
define the CRS in the {{CUSTOM}} namespace.
> One open question is where (in which directory) to put those files.



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