Re: Geographic metadata in Spatial Data on the Web Best Practices

Thanks Martin, I have fwd'd to the editors.

Ed


On Tue, 4 Apr 2017 at 17:04 Martin Desruisseaux <
martin.desruisseaux@geomatys.com> wrote:

> Hello Ed
>
> For EPSG codes, the best practice documents links to http://epsg.io in
> many places. Would it be possible to replace http://epsg.io links by
> http://epsg-registry.org links? The later is the only official source of
> EPSG definitions, and those two sources differ in axis order and other
> aspects. There is unfortunately a lot of confusion about axis order and (to
> lesser extend) units of measurement of CRS defined by EPSG codes, so I
> worry that having W3C referencing a site publishing non-compliant EPSG
> definitions may contribute to the confusion. For example the document has
> some sentences accurately describing WGS 84 as (Lat/Long), but the link to
> http://epsg.io/4326 describes a (Long/Lat) system (except in their GML
> definitions).
>
> The proposed replacements are:
>
>    - http://epsg.io/28992 ->
>    http://epsg-registry.org/?display=entity&urn=urn:ogc:def:crs:EPSG::28992
>    - http://epsg.io/27700 ->
>    http://epsg-registry.org/?display=entity&urn=urn:ogc:def:crs:EPSG::27700
>    - *etc.* for all EPSG codes (a search in the HTML source code shows 22
>    occurrences).
>
> I suggest to also replace the following sentence in chapter 8:
>
> Definitions of coordinate reference systems are available from the Open
> Geospatial Consortium CRS Register, Spatial Reference and EPSG.io (an
> open-source web service which simplifies discovery of coordinate reference
> systems utilized worldwide).
>
> By
>
> Definitions of coordinate reference systems are available from the Open
> Geospatial Consortium CRS Register <http://www.opengis.net/def/crs/> and EPSG
> registry <http://epsg-registry.org/> (the official source of EPSG
> definitions). Other web services like Spatial Reference
> <http://spatialreference.org/> and EPSG.io <http://epsg.io> also provide
> definitions as used in popular software, but those definitions — especially
> the ones published in Well Known Text (WKT) version 1 format — sometime
> differ from official EPSG definitions in axis order and units of
> measurement.
>
> Regards,
>
>     Martin
>
>
> Le 04/04/2017 à 15:16, Ed Parsons a écrit :
>
> Hello Neil,
>
> I am working my way through the  public comments made to the Spatial Data
> on the Web working group prior to the release of final draft of the Best
> Practice Document, current version here https://www.w3.org/TR/sdw-bp/
>
> Hopefully you will notice a section that deals specifically with
> approaches to making metadata about spatial data including ISO 19115
> compliant metadata more accessible - there is more work to do in this
> section before the final draft, but you very valid point about the value of
> existing metadata records has been taken onboard.
>
> https://www.w3.org/TR/sdw-bp/#bp-metadata
>
> Would you allow me to therefore  mark this comment as closed ?
>
> Many thanks for your contribution.
>
>
> --


*Ed Parsons *FRGS
Geospatial Technologist, Google

+44 7825 382263 @edparsons
www.edparsons.com