[SAC] [OSGeo] #2268: Incubation request: PROJ

OSGeo trac_osgeo at osgeo.org
Tue Sep 10 11:15:52 PDT 2019


#2268: Incubation request: PROJ
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 Reporter:  kbevers    |       Owner:  jive
     Type:  task       |      Status:  new
 Priority:  normal     |   Milestone:
Component:  Incubator  |  Resolution:
 Keywords:             |
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Comment (by desruisseaux):

 Just for context, two minors corrections on the following sentence:

 > PROJ support the Well-Known Text and Well-Known Text2 described in the
 ISO 19111 standard on "Referencing by coordinates". I am not aware of any
 official certification. To the best of my knownledge PROJ is the first
 application to implement WKT2, so it can in some sense be regarded as a
 reference implementation.

 Actually the WKT 2 format is specified by ISO 19162, not ISO 19111. The
 later is rather the conceptual model from which PROJ 6 API is derived.

 PROJ is not the first application to implements WKT 2. The open-source
 [https://github.com/Esri/ogc-crs-wkt-parser ESRI prototype on GitHub] is
 the first ISO 19162 (WKT 2) implementation I'm aware of.
 [http://sis.apache.org/ Apache SIS] came next in 2017. PROJ 6 is third to
 my knowledge. However PROJ 6 may be the first project to implement the
 WKT2 update published in 2019, but this is a relatively minor revision of
 ISO 19162:2015 compared to WKT 1.

 Note also that the "PROJ support the Well-Known Text" sentence is a little
 bit ambiguous. Actually PROJ supports a WKT 1 dialect which is not the
 standard one as defined in OGC 01-009 (the standard mandated by Geopackage
 among others). For EPSG::4807 CRS, the PROJ interpretation of WKT 1 has an
 offset of 17 km at the latitude of Paris compared to the OGC 01-009
 interpretation.

-- 
Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2268#comment:4>
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