Re: Minor tuning proposal on links related to CRS

+1

On Thu, 24 Nov 2016, 01:31 Little, Chris, <chris.little@metoffice.gov.uk>
wrote:

> +1 Excellent suggestions
>
>
>
> *From:* Martin Desruisseaux [mailto:martin.desruisseaux@geomatys.com]
> *Sent:* Monday, November 07, 2016 3:50 PM
> *To:* public-sdw-comments@w3.org
> *Subject:* Minor tuning proposal on links related to CRS
>
>
>
> Hello all
>
> About the "Spatial Data on the Web Best Practices" draft document, I would
> like to propose two minor editions on the links at the end of chapter 7
> (Coordinate Reference Systems) on
> https://www.w3.org/TR/sdw-bp/#CRS-background. The document redirects the
> reader to Spatial Reference (http://spatialreference.org/) and EPSG.io (
> http://epsg.io/) web sites for CRS definitions. But the definitions on
> those web sites sometime differ from the OGC and EPSG definitions regarding
> axis order and units of measurement. The definitions on those web sites are
> rather the ones used by GDAL (the library behind MapServer, PostGIS and
> QGIS among others). Maybe the use of those definitions was an intentional
> choice? (e.g. it was the choice of GeoJSON before they deprecated CRS in
> the IETF standard, precisely because they were not OGC/EPSG definitions).
> If the document rather aims to reference OGC/EPSG definitions, then should
> the document links to the authoritative source, which is
> http://epsg-registry.org/ ? It does not mean to remove the other links,
> but maybe a little explanatory text like below would be appropriate?
>
> Instead of:
>
> Lists of CRS are available from the Open Geospatial Consotium CRS
> Register, Spatial Reference and EPSG.io (an open-source web service which
> simplifies discovery of coordinate reference systems utilized worldwide).
>
> Maybe something like below?
>
> The authoritative source of CRS definitions is the EPSG registry. Those
> definitions are also available from the Open Geospatial Consotium CRS
> Register. Alternative source of CRS definitions are Spatial Reference and
> EPSG.io (an open-source web service which simplifies discovery of
> coordinate reference systems utilized worldwide). But those alternatives
> sometime uses different axis order and units of measurements than the
> authoritative definitions.
>
> About the link to the Apache SIS documentation in the last paragraph
> (thanks!), would you mind changing the
> http://sis.staging.apache.org/book/en/developer-guide.html URL to
> http://sis.apache.org/book/en/developer-guide.html (i.e. just remove the
> "staging" part in the URL)?
>
>     Best regards,
>
>         Martin Desruisseaux
>
>
>
-- 

*Ed Parsons *FRGS
Geospatial Technologist, Google

Google Voice +44 (0)20 7881 4501
www.edparsons.com @edparsons