[MapServer-dev] PROJECTION block strings and init=

[Seth G]

Thanks Jukka. So the "init=esri" is a known issue and not supported when using proj.db, but "init=epsg" is supported still. 

I'm not suggesting we remove "init=" for projections that are actually stored in init files, but do you think we should guide users to use "EPSG:4326" rather than "init=ESPG:4326" for all projections that are found in proj.db?

Seth
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On Thu, Aug 24, 2023, at 2:14 PM, Rahkonen Jukka wrote:
> Hi,
>
> There is a ticket https://github.com/OSGeo/PROJ/issues/1895 saying the 
> +init esri: is not supported even when +init is enabled.
>
> The deprecation of the init files is not mentioned for example here 
> https://proj.org/en/9.2/resource_files.html#init-files.
>
> -Jukka Rahkonen-
>
>
>
> -----Alkuperäinen viesti-----
> Lähettäjä: MapServer-dev <mapserver-dev-bounces at lists.osgeo.org> Puolesta Seth G
> Lähetetty: torstai 24. elokuuta 2023 13.52
> Vastaanottaja: MapServer Devs <mapserver-dev at lists.osgeo.org>
> Aihe: [MapServer-dev] PROJECTION block strings and init=
>
> Hi all,
>
> I just ran into an issue when using the following projection block 
> returned "msProcessProjection(): Projection library error. proj error 
> "Invalid value for an argument" for "init=esri:54052":
>
>     PROJECTION
>         "init=esri:54052"
>     END
>
> However using the following without the "init=" works:
>
>     PROJECTION
>         "esri:54052"
>     END
>
> This is confusing as "esri:54052" is in the proj.db, and for EPSG code 
> both approaches work e.g. "init=epsg:4326" and "epsg:4326" are both 
> fine.
>
> As noted in the PROJ docs [1] the "init=" PROJ strings were deprecated in PROJ6.
>
> So a couple of questions:
>
> 1. Should we update the msautotests and MapServer docs to remove  
> "init=" from PROJECTION blocks?
>    However I think the "init=" needs to be kept to support custom 
> projections not in proj.db as used in [2] 2. Should we consider having 
> a minimum required version of PROJ for a future release of MapServer? 
> This would allow backwards compatible code to be removed.
>
>
> Seth
>
> [1] 
> https://proj.org/en/9.2/development/migration.html#backward-incompatibilities
> [2] https://github.com/MapServer/MapServer/pull/6795
>
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> twitter: @geographika
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