AW: How to represent geographic coordinates for maps

Hi John,

> Maybe use georss:Box. Alternative (and probably more future proof) look at
> GeoSPARQL and encode the geometry that way. Not too many GeoSPARQL
> implementations around at the moment though.

Or using both wgs84 and GeoSparql in parallel...

What I learned so far was that my assumption that we cannot attach wgs84 or GeoSparql directly to maps was right. 

Thanks for all input.

Lars


***Lesen. Hören. Wissen. Deutsche Nationalbibliothek***
***Reading. Listening. Understanding. German National Library***

-- 
Dr. Lars G. Svensson
Deutsche Nationalbibliothek / Informationstechnik
http://www.dnb.de/

l.svensson@dnb.de


> -----Ursprüngliche Nachricht-----
> Von: John Goodwin [mailto:John.Goodwin@ordnancesurvey.co.uk]
> Gesendet: Freitag, 12. Juli 2013 15:50
> An: Konrad Höffner; public-geosemweb@w3.org
> Betreff: RE: How to represent geographic coordinates for maps
> 
> Hi,
> 
> I was just about to type the same as Konrad. The coordinate representation
> would be very hard to do anything useful with. You could possibly look at
> using:
> 
> http://www.w3.org/2005/Incubator/geo/XGR-geo-20071023/

> 
> Maybe use georss:Box. Alternative (and probably more future proof) look at
> GeoSPARQL and encode the geometry that way. Not too many GeoSPARQL
> implementations around at the moment though.
> 
> John
> 
> Dr John Goodwin
> Principal Scientist
> Research, Ordnance Survey
> Adanac Drive, SOUTHAMPTON, United Kingdom, SO16 0AS
> Phone: +44 (0) 23 8005 5761
> www.ordnancesurvey.co.uk | john.goodwin@ordnancesurvey.co.uk Please
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> 
> -----Original Message-----
> From: Konrad Höffner [mailto:konrad.hoeffner@uni-leipzig.de]
> Sent: 12 July 2013 10:51
> To: public-geosemweb@w3.org
> Subject: Re: How to represent geographic coordinates for maps
> 
> Hi Lars,
> 
> To question 3: First, I think that depending on the projection and scale, a
> rectangle on a map is not/only nearly representable by a rectangle in
> geocoordinates.
> Furthermore, the representation you chose (""W 13' - E 49' / N 45°58' - N
> 45°33'""") is not very easily machine-readable because you code a rectangle
> into a single literal and also use a coordinate notation that needs additional
> parsing.
> Maybe polygons like the ones used in LinkedGeoData would be helpful? A
> 
> Regards,
> Konrad
> 
> On 12.07.2013 11:14, Svensson, Lars wrote:
> > All,
> >
> > At the German National Library we are currently looking into how to
> represent coordinates for maps and we need some advice on which
> representation would be most useful for the community.
> >
> > While looking at publishing coordinates for places in the library authority
> data, we also started looking at how to represent the geographic extent of
> maps. I came across three vocabularies that could be useful for that:
> > 1) the (library-specific?) properties scale:
> > http://rdvocab.info/Elements/scale, projection:
> > http://rdvocab.info/Elements/projectionOfCartographicContent and
> > coordinates:
> > http://rdvocab.info/Elements/coordinatesOfCartographicContent from
> RDA
> > (Resource Description and Access)
> > 2) the properties from wgs84_pos
> > 3) the properties from geosparql
> >
> > If I have understood things correctly, only the RDA ones are applicable
> directly for a map, whereas wgs84 and geosparql really are about places and
> not about maps, so that you would need to introduce a level of indirection to
> use them directly for maps. A (made-up) example:
> >
> > my:resource a ex:Map ;
> >         dc:title "The Marauder's Map" ;
> >         rdvocab:coordinatesOfCartographicContent """W 13' - E 49' / N 45°58' -
> N 45°33'""" .
> >
> > my:resource a ex:Map ;
> >         dc:title "The Marauder's Map" ;
> >         dct:coverage [ a wgs84_pos:SpatialThing ;
> >                 wgs84_pos:lat_long """ W 13' - E 49' / N 45°58' - N 45°33'""" ;
> >                 .
> >         ] .
> >
> > So my three questions:
> > 1) Is my interpretation of the use of wgs84 for maps correct?
> > 2) Are coordinates for maps of any use at all to this community?
> > 3) (If the answer to 2) is yes): which representation would be the best for
> your use cases?
> >
> > Thanks in advance for any insight,
> >
> > Lars
> >
> > ***Lesen. Hören. Wissen. Deutsche Nationalbibliothek*** ***Reading.
> > Listening. Understanding. German National Library***
> >
> 
> 
> 
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Received on Friday, 12 July 2013 14:46:51 UTC