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

Turns out you can't do it in a paragraph, here is my first attempt...

https://docs.google.com/document/d/1EO70CvPJWg_dWcmgrzElUQMe6IK5OTry5S291ALQoKo/edit?usp=sharing

Feel free to comment, however I will not react to your valuable
contributions until I return from my holidays in two weeks time.

Ed


On Mon, 1 Aug 2016 at 11:07 Rob Atkinson <rob@metalinkage.com.au> wrote:

> 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
>>
> --

*Ed Parsons *FRGS
Geospatial Technologist, Google

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