Hi,

Support for other CRSs than WGS84 is definitely needed and by now the best 
option for my mind is to use pre-RFC GeoJSON. Even it is deprecated it has 
quite wide support for example through GDAL. The OGC work on the new Features 
and Geometries JSON happens in 
https://github.com/opengeospatial/ogc-feat-geo-json but it will still take 
about a year before the standard is ready.

-Jukka Rahkonen-


Lähettäjä: Andrea Aime <andrea.a...@geosolutionsgroup.com>
Lähetetty: torstai 29. syyskuuta 2022 11.33
Vastaanottaja: Ian Turton <ijtur...@gmail.com>
Kopio: geoserver-users@lists.sourceforge.net
Aihe: Re: [Geoserver-users] WPS Process SRS Output blocked to EPSG:4326

On Fri, Sep 23, 2022 at 6:00 PM Ian Turton 
<ijtur...@gmail.com<mailto:ijtur...@gmail.com>> wrote:
GeoJSON is required to be in 4326 by the specification, we have just come into 
conformance with that standard. I don't think there is any way to force it back 
to the old way.

Hmm... that aspect of the specification is broken for several applications (the 
ones in need of centimetric+ accuracy, due to the uncertainty of WGS84 epoch).
OGC API Features opted for the prior 
arrangement<https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.ogc.org%2Fis%2F18-058%2F18-058.html%23_features_and_feature_resources&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C63ec9cb08d1a4475500708daa1f5f638%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C638000375024757125%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=WnKfpqZlc%2FvuT9gxlYPThE8Ph5KZs%2FFlTHBAM07lVYw%3D&reserved=0>
 clause and have set up a working group for GeoJSON extensions that will break 
it free of such 
limitations<https://eur06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fportal.ogc.org%2Ffiles%2F95319%23_business_value_proposition&data=05%7C01%7Cjukka.rahkonen%40maanmittauslaitos.fi%7C63ec9cb08d1a4475500708daa1f5f638%7Cc4f8a63255804a1c92371d5a571b71fa%7C0%7C0%7C638000375024913363%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=iAu6IverUdrUQY6ZFywUjaY1ZgxJfefPWpAvSimqKrM%3D&reserved=0>.

On a practical note, I believe GeoServer should allow for choice, maybe driven 
by the mime type:

  *   if the "application/geo+json" official mime type is used, maybe be strict 
and generate RFC compliant GeoJSON
  *   if "application/json" is used instead, generate pre-RFC GeoJSON with 
native CRS and the CRS attribute
Cheers
Andrea

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