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<p>FYI</p>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Sujet :
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<td>[CRS.SWG] Proposed CRS JSON encoding</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date : </th>
<td>Wed, 24 Apr 2024 18:52:16 +0000</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">De : </th>
<td>Keith Ryden via CRS.SWG <a class="moz-txt-link-rfc2396E" href="mailto:crs.swg@lists.ogc.org"><crs.swg@lists.ogc.org></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Répondre
à : </th>
<td>Keith Ryden <a class="moz-txt-link-rfc2396E" href="mailto:kryden@esri.com"><kryden@esri.com></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Pour : </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:crs.swg@lists.ogc.org">crs.swg@lists.ogc.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:crs.swg@lists.ogc.org"><crs.swg@lists.ogc.org></a>,
<a class="moz-txt-link-abbreviated" href="mailto:coordtran.wg@lists.ogc.org">coordtran.wg@lists.ogc.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:coordtran.wg@lists.ogc.org"><coordtran.wg@lists.ogc.org></a></td>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none">Folks,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none">Per
the discussion in Delft during the CRS Joint SWG/DWG
meeting, a github repo (</span><span class="MsoHyperlink"><a
href="https://github.com/opengeospatial/CRS-JSON-Encoding"
moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/opengeospatial/CRS-JSON-Encoding</a></span><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none">)
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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328;mso-ligatures:none">Keith<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">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: <a
href="https://portal.ogc.org/files/?artifact_id=102055&version=1"
moz-do-not-send="true">https://portal.ogc.org/files/?artifact_id=102055&version=1</a><o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">For
convenience, the relevant portion of the charter document
has been repeated here:<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">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:<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">*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.<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">*Ensures
that a JSON schema is available that will be kept in
alignment with OGC Abstract Specification Topic 2 and ISO
19111<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">*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.<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">The
CRS SWG has recently completed work on:<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">22-010r4
Topic 24 Functional Model for Crustal Deformation (<a
href="https://portal.ogc.org/files/?artifact_id=106827&version=1"
moz-do-not-send="true">https://portal.ogc.org/files/?artifact_id=106827&version=1</a> [portal.ogc.org])<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">22-051r7
GGXF geodetic data grid exchange format v1.0 (<a
href="https://portal.ogc.org/files/?artifact_id=106828&version=1"
moz-do-not-send="true">https://portal.ogc.org/files/?artifact_id=106828&version=1</a> [portal.ogc.org])<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">And
are now able to begin the important work of vetting and
documenting the CRS JSON encoding.<o:p></o:p></span></p>
<p
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">In
the March 2024 Delft joint CRS SWG/DWG working group
meeting, it was agreed that we would set up this github repo
(<a
href="https://github.com/opengeospatial/CRS-JSON-Encoding"
moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/opengeospatial/CRS-JSON-Encoding</a></span><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:black">)</span><span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">
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).<o:p></o:p></span></p>
<p
style="margin:0in;background:white;box-sizing: border-box;font-variant-ligatures: normal;font-variant-caps: normal;orphans: 2;text-align:start;widows: 2;-webkit-text-stroke-width: 0px;text-decoration-thickness: initial;text-decoration-style: initial;text-decoration-color: initial;word-spacing:0px">
<span
style="font-size:12.0pt;font-family:"Segoe UI",sans-serif;color:#1F2328">The
PROJSON Schema documentation can be found at: <a
href="https://proj.org/en/9.4/specifications/projjson.html"
moz-do-not-send="true" class="moz-txt-link-freetext">https://proj.org/en/9.4/specifications/projjson.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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