[Auscope-geosciml] boo-boo in GeologicEvent

stephen richard steve.richard at azgs.az.gov
Fri Sep 25 13:29:47 EDT 2009


I think we're talking about position on a timeline, with a CRS set up 
such that origin is 1950, and positive is older
steve

Simon Cox wrote:
> 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
>
>
> --------------------------------------------------------
> 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 
> http://ies.jrc.ec.europa.eu/simon-cox 
>
> SDI Unit: http://sdi.jrc.ec.europa.eu/ 
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> --------------------------------------------------------
>
> -----Original Message-----
> From: auscope-geosciml-bounces at lists.arcs.org.au
> [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of stephen
> richard
> 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.
>
> steve
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