[Auscope-geosciml] boo-boo in GeologicEvent

Simon Cox simon.cox at jrc.ec.europa.eu
Fri Sep 25 08:30:13 EDT 2009

Yes - TM_Period is about a discrete interval, not uncertainty. 

There is also the matter of whether 'age' means
- position on a timeline, a coordinate
   - the conventional origins make this a negative number for most
geological events
- amount of time embodied in (or 'since') the event, a quantity

I.e. interval- vs. ratio-scale. 


Simon Cox

European Commission, Joint Research Centre, 
Institute for Environment and Sustainability, 
Spatial Data Infrastructures Unit, TP 262 
Via E. Fermi, 2749, I-21027 Ispra (VA), Italy 
Tel: +39 0332 78 3652
Fax: +39 0332 78 6325
mailto:simon.cox at jrc.ec.europa.eu 

SDI Unit: http://sdi.jrc.ec.europa.eu/ 
IES Institute: http://ies.jrc.ec.europa.eu/
JRC: http://www.jrc.ec.europa.eu/

-----Original Message-----
From: auscope-geosciml-bounces at lists.arcs.org.au
[mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of stephen
Sent: Friday, 25 September 2009 14:00
To: auscope-geosciml at lists.arcs.org.au
Subject: [Auscope-geosciml] boo-boo in GeologicEvent

There was some uncertainty on my part yesterday as to whether TM_Period is
the correct type for numericAgeDate. After studying the ISO 19108
temporalSchema some more, I conclude its not; it only allows a time
coordinate specified by a single number, no uncertainty. I recommend we
change TM_Period to CGI_NumericRange; this is more consistent with the rest
of the model, represents what we want better, and avoids another proxy for a
GML3.2 element for v. 3 testing.

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