Re: Request for input to the BP doc: an introduction to CRSs and related concepts

CRS are not standardised for the same reason we don't all speak English :-)
 I will however give it a go..

ed


On Mon, 1 Aug 2016 at 07:39 Linda van den Brink <l.vandenbrink@geonovum.nl>
wrote:

> Hi,
>
>
>
> I still remember well when I started working at Geonovum and first found
> out that there were many different coordinate reference systems. It seemed
> very silly to me that this was not standardized.
>
>
>
> When one of you takes up Jeremy’s challenge, please see what is already
> written about CRS in http://w3c.github.io/sdw/bp/#ref-crs . It makes
> sense to move some of this to an introductory section in the front of the
> document, and any content making this section more accessible is welcome!
>
>
>
> Linda
>
>
>
> *Van:* Jeremy Tandy [mailto:jeremy.tandy@gmail.com]
> *Verzonden:* zaterdag 30 juli 2016 10:06
> *Aan:* SDW WG Public List; Ed Parsons
> *Onderwerp:* Request for input to the BP doc: an introduction to CRSs and
> related concepts
>
>
>
> Hi-
>
>
>
> Thinking about the article that I just shared [1] on the mailing list it
> occurs to me that to the majority of webby folk, coordinate reference
> systems, projections, datums and the like will seem like some kind of dark
> art ...
>
>
>
> All they will be used to is what every global mapping provider uses: spherical
> / web mercator EPSG:3857 [2] “google maps projection”
>
>
>
> And likely they don't give it any thought at all.
>
>
>
> Much in the same way that I have introduced features / spatial things and
> geometry in the front material of the SDW BP doc [3], I think we need a
> _short_ section to introduce the topic of coordinate/spatial reference
> systems (including non-earth CRS; e.g. cartesian used in
> imagery/microscopy) and projections so that readers:
>
> 1. know what the terms mean (a little bit - point them to references if
> they want to find out more)
>
> 2. why it matters
>
>
>
> Please can a member of the Working Group provide a paragraph or two- and
> better still do it in GitHub and create a Pull Request with your proposal?
>
>
>
> I'm thinking that this might be right up @eparsons' street (no spatial pun
> intended). I also recall that I've recently had conversations with @josh
> about CRS.
>
>
>
> Please help.
>
>
>
> Best Regards, Jeremy
>
>
>
> (who is still thinking about work while I'm trying to pack holiday
> suitcases!)
>
>
>
> PS: I also note that the section I have written on spatial references [4]
> is a little underwhelming. If anyone fancies re-working that section, I
> would appreciate it very much!
>
>
>
> [1]: https://lists.w3.org/Archives/Public/public-sdw-wg/2016Jul/0336.html
>
> [2]: https://epsg.io/3857
>
> [3]: http://w3c.github.io/sdw/bp/#spatial-things-features-and-geometry
>
> [4]: http://w3c.github.io/sdw/bp/#spatial-relations
>
-- 

*Ed Parsons *FRGS
Geospatial Technologist, Google

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