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

John Wieczorek tuco at berkeley.edu
Tue Aug 24 22:44:15 CEST 2010

Catching up on this diverse thread...

I suspect the sources for coordinates the BioBlitz will be phones and GPS
receivers. I don't know of any phone application or consumer GPS receiver
that provides coordinates in a reference system other than WGS84 by
default. As Peter suggests, under these assumptions it would be fine to
capture geo:lat, geo:long, and dwc:coordinateUncertaintyInMeters in the
field. The expression of these data in Darwin Core would be
dwc:decimalLatitude: dwc:decimalLongitude, dwc:geodeticDatum=WGS84
or wc:geodeticDatum=epsg:4326, dwc:coordinateUncertaintyInMeters.

It would be a nice educational exercise to assess the parameters of the
devices before starting to use them to take data. What are the accuracies of
those phones compared to the GPSs? And of the GPSs compared to reality and
to their theoretical (and ephemeral) accuracy readings?

For completeness one could add the other georeference metadata fields meant
to provide completeness (strictly for educational purposes, of course), but
I won't push it.

On Sat, Aug 21, 2010 at 8:19 PM, Peter DeVries <pete.devries at gmail.com>wrote:

> I was wondering if something like the following would be an acceptable
> compromise for those who would like to expose their data using the geo
> vocabulary.
> geo:lat
> geo:long
> dwc:coordinateUncertaintyInMeters
> The idea would be that RDF formatted in this way would be acceptable as
> DarwinCore.
> This would not prevent others from using the traditional dwc vocabulary.
> The problem for many is that by using only the dwc version they use the
> ability to take advantage of many existing tools and api's.
> - Pete
> On Fri, Aug 6, 2010 at 10:01 AM, joel sachs <jsachs at csee.umbc.edu> 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.
> --
> ----------------------------------------------------------------
> Pete DeVries
> Department of Entomology
> University of Wisconsin - Madison
> 445 Russell Laboratories
> 1630 Linden Drive
> Madison, WI 53706
> GeoSpecies Knowledge Base
> About the GeoSpecies Knowledge Base
> ------------------------------------------------------------
> _______________________________________________
> tdwg-tag mailing list
> tdwg-tag at lists.tdwg.org
> http://lists.tdwg.org/mailman/listinfo/tdwg-tag
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.tdwg.org/pipermail/tdwg-tag/attachments/20100824/184b0780/attachment.html 

More information about the tdwg-tag mailing list