[PROJ] Fwd: [CRS.SWG] Proposed CRS JSON encoding

[Even Rouault]

FYI

-------- Message transféré --------
Sujet : 	[CRS.SWG] Proposed CRS JSON encoding
Date : 	Wed, 24 Apr 2024 18:52:16 +0000
De : 	Keith Ryden via CRS.SWG <crs.swg at lists.ogc.org>
Répondre à : 	Keith Ryden <kryden at esri.com>
Pour : 	crs.swg at lists.ogc.org <crs.swg at lists.ogc.org>, 
coordtran.wg at lists.ogc.org <coordtran.wg at lists.ogc.org>



Folks,

Per the discussion in Delft during the CRS Joint SWG/DWG meeting, a 
github repo (https://github.com/opengeospatial/CRS-JSON-Encoding) has 
been set up to capture any issues or discussion items for establishing a 
CRS JSON encoding.  The text below is from the ReadMe file in the 
repository and describes the effort, scope under the CRS SWG Charter, 
and plan for review in Montreal.

Thanks

Keith

During the June 2022 OGC Member Meeting in Madrid Spain, the joint CRS 
DWG/SWG working groups approved a motion to work on the adoption of a 
JSON Schema for Coordinate references to be defined in parallel with the 
CRS WKT Standard and derived from ISO 19111 and OGC Topic 2. The full 
text of the CRS SWG charter with updated scope to cover the CRS JSON 
scheme encoding can be found at: 
https://portal.ogc.org/files/?artifact_id=102055&version=1 
<https://portal.ogc.org/files/?artifact_id=102055&version=1>

For convenience, the relevant portion of the charter document has been 
repeated here:

To support an encoding of the self-contained and compact description of 
Coordinate Reference Systems and Coordinate Operations through a simple 
JSON schema. The implementation specification delivered will be 
consistent with OGC Abstract Specification Topic 2 and ISO 19111. This 
offers the following advantages:

*Provides a JSON encoding of coordinate reference systems descriptions 
for use where JSON may be considered a more natural data schema than 
Well Known Text.

*Ensures that a JSON schema is available that will be kept in alignment 
with OGC Abstract Specification Topic 2 and ISO 19111

*Recognizing the PROJ6 origins of the PROJJSON schema contribution being 
used as the starting point of this work, effort will be made to try to 
avoid compatibility issues and to clearly document any issues identified 
or object names that deviate from the original OGC Abstract 
Specification Topic 2 and ISO 19111. If an unresolvable conflict is 
identified, OGC Abstract Specification Topic 2 and ISO 19111 will guide 
the resolution and such an issue will be clearly documented.

The CRS SWG has recently completed work on:

22-010r4 Topic 24 Functional Model for Crustal Deformation 
(https://portal.ogc.org/files/?artifact_id=106827&version=1 
<https://portal.ogc.org/files/?artifact_id=106827&version=1> [portal.ogc.org])

22-051r7 GGXF geodetic data grid exchange format v1.0 
(https://portal.ogc.org/files/?artifact_id=106828&version=1 
<https://portal.ogc.org/files/?artifact_id=106828&version=1> [portal.ogc.org])

And are now able to begin the important work of vetting and documenting 
the CRS JSON encoding.

In the March 2024 Delft joint CRS SWG/DWG working group meeting, it was 
agreed that we would set up this github repo 
(https://github.com/opengeospatial/CRS-JSON-Encoding)to serve as an open 
public repository to gather up any issues identified in alignment of the 
existing PROJ JSON Schema with OGC Abstract Specification topic 2 and 
ISO 19111. As discussed in the CRS SWG charter, this encoding will align 
with OGC Abstract Specification topic 2 and ISO 19111, and will be 
informed by the existing PROJ JSON schema, aiming for compatibility with 
the existing PROJ JSON schema where practical. Reviewers are asked to 
submit issues for any alignment issues they identify. These issues will 
be the topic of discussion at the June joint CRS SWG/DWG meeting in 
Montreal Canada (date and time still TBD).

The PROJSON Schema documentation can be found at: 
https://proj.org/en/9.4/specifications/projjson.html
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