[tdwg-tag] time and space namespaces in Darwin Core

[John Wieczorek]

The partially good news is that if enough information (dwc:geodeticDatum) is
given in a Darwin Core-based record, geo:lat/lon can be determined from it.
More disturbing to me is that anyone would think geo:lat/lon alone is
sufficient for any application, as it carries no notion of uncertainty and
therefore fitness for use. Add dwc:coordinateUncertaintyInMeters (or even
dwc:coordinatePrecision if you must) to the mix and I would be much happier.


On Sun, Aug 8, 2010 at 11:26 PM, <Garry.Jolley-Rogers at csiro.au> wrote:

> Hi Jim,
>        Thanks. Had this aside to read in detail later.  I think John is
> right... As same value with different constraints mean different
> interpretations are possible and seems to be the key thing. How are the
> values to be interpreted.
>
> G
>
> -----Original Message-----
> From: Jim Croft [mailto:jim.croft at gmail.com]
> Sent: Monday, 9 August 2010 4:12 PM
> To: Alexander, Paul (PI, Black Mountain); Harvey, Paul.W (PI, Black
> Mountain); Jolley-Rogers, Garry (PI, Black Mountain); Cawsey, Margaret (CES,
> Crace); Greg Whitbread
> Cc: tuco at berkeley.edu
> Subject: Fwd: [tdwg-tag] time and space namespaces in Darwin Core
>
> Did you catch this thread on tdwg-tag?  It is an almost exact mirror
> of the conversations we have be having in the taxon profile space, but
> involving the specimen locational data.
>
> From John's comments it would appear he is not prepared to accept the
> geo: and dwc: lat/long as 'exact match' because, although they are the
> same values, they have different constraints (or more precisely one
> one has a constraint and one doesn't).
>
> I wouldn't have picked it but this looks like a case for 'closematch'.
>
> jim
>
>
> ---------- Forwarded message ----------
> From: John Wieczorek <tuco at berkeley.edu>
> Date: Mon, Aug 9, 2010 at 3:56 AM
> Subject: Re: [tdwg-tag] time and space namespaces in Darwin Core
> To: joel sachs <jsachs at csee.umbc.edu>
> Cc: tdwg-bioblitz at googlegroups.com, tdwg-tag at lists.tdwg.org
>
>
> There is actually no equivalency between dwc:decimalLatitude and
> geo:lat  because geo:lat is specified to represent the latitude in the
> WGS84 spatial reference system and dwc:decimalLatitude has no such
> such restriction.
>
> On Fri, Aug 6, 2010 at 10:08 AM, joel sachs <jsachs at csee.umbc.edu> wrote:
> >
> > On Fri, 6 Aug 2010, Hilmar Lapp wrote:
> >
> > > Shouldn't the RDF for DwC link DwC:lat to geo:lat (using some subtype
> > > or better yet equivalency relation)? And shouldn't hence Linked Data
> > > browsers be able to use DwC:lat in the same way as geo:lat?
> > >
> >
> > Yes. But no Linked Data browser I'm aware of applies
> > owl:equivalentProperty assetions before rendering the data. (In fact,
> most
> > do no reasoning at all.) I agree that, whatever our default display,
> > it should include the appropriate mapping statements, either via an
> > rdfs:seeAlso or similar link, or directly in the document.
> >
> >
> > Joel.
> >
> >
> > >       -hilmar
> > >
> > > On Aug 6, 2010, at 11:01 AM, joel sachs wrote:
> > >
> > >> All,
> > >>
> > >> When representing observation records in RDF, there are advantages
> > >> to using Dublin Core and Geo (http://www.w3.org/2003/01/geo/
> > >> wgs84_pos#)
> > >> namespaces where possible. For example, if we use DC:date, and
> > >> geo:lat, geo:long, instead of DwC:eventDate, DwC:lat, and DwC:long,
> > >> then Linked Data browsers can automatically map the records, plot
> > >> them on a timeline, etc.
> > >>
> > >> My question is: What are the disadvantages to doing this? (For
> > >> example, is this going to break someone's DwC validator?)
> > >>
> > >> Thanks -
> > >> Joel.
> > >>
> > >
> > > --
> > > ===========================================================
> > > : Hilmar Lapp  -:- Durham, NC -:- informatics.nescent.org :
> > > ===========================================================
> > >
>
> _________________
> Jim Croft ~ jim.croft at gmail.com ~ +61-2-62509499 ~
> http://www.google.com/profiles/jim.croft
> 'A civilized society is one which tolerates eccentricity to the point
> of doubtful sanity.'
>  - Robert Frost, poet (1874-1963)
>
> Please send URIs, not attachments:
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