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

From: Rob Atkinson <rob@metalinkage.com.au>
Date: Mon, 01 Aug 2016 10:07:34 +0000
Message-ID: <CACfF9LwxRLuseNVRYP8hp4cdzSJa1K9agb2SQQeckOdyYpjKXg@mail.gmail.com>
To: Ed Parsons <eparsons@google.com>, Linda van den Brink <l.vandenbrink@geonovum.nl>, SDW WG Public List <public-sdw-wg@w3.org>
Cc: Jeremy Tandy <jeremy.tandy@gmail.com>
what - we all have funny shaped heads?  :-)



On Mon, 1 Aug 2016 at 19:14 Ed Parsons <eparsons@google.com> wrote:

> 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
>
Received on Monday, 1 August 2016 10:09:42 UTC

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