Indeed durations can be measured as distances between two events.
Einstein regarded that length measurements are two simultaneous events
matching both endpoints of a yardstick with something. This is the basis
of the Theory of Relativity.
Basically we have to do with signals.
To be discussed!
M
On 9/9/2020 5:49 PM, Robert Sanderson wrote:
Thanks Thanasis. Yes, there's various dimensions that are associated
with non-Things, and I agree that Place is particularly easy to justify.
Place: Area. The county of Los Angeles has a dimension of 4751 square
miles. If the place is approximate, then the radius of a centroid
would be an obvious dimension to record, or height/width for bounding
box defined Places.
Time-Span: Duration is already a property of a Time-Span that refers
to a dimension (P191). This could then be a subproperty of P43, or
deprecated in favor of a classification on the Dimension.
Temporal Entity and Spacetime Volume are a bit strange in relation to
Time-Span. Does the Period have the duration or the Time-Span, or
both? What if they're different
Conversely Dimensions seem like they should not have Dimensions.
Rob
On Wed, Sep 9, 2020 at 10:33 AM Athanasios Velios
<[email protected] <mailto:[email protected]>> wrote:
Good point, but it seems to me that being able to measure a Place is
pretty important. Otherwise we have to measure through the physical
object/site reference or the declarative space as part of a
conceptual
thing.
Thanasis
On 09/09/2020 13:39, Robert Sanderson wrote:
>
> Dear all,
>
> I believe that there is an inconsistency in the model for
measurements
> and dimensions.
>
> E54 Dimensions are associated directly with E70 Things using P43
has
> dimension. So not every class can have dimensions, only those
that are
> descendents of E70.
>
> However E16 Measurement's property P39 measured has a range of
E1 CRM
> Entity, meaning that while (for example) an E53 Place cannot have a
> dimension, it can be measured to have a dimension. This seems
> inconsistent that an entity that cannot have dimensions can
still be
> measured.
>
> I propose that the range of P39 measured be changed to E70 Thing to
> resolve this inconsistency.
>
> I would also be okay with the other direction by changing the
domain of
> P43 has dimension to be E1 CRM Entity, however that seems like a
much
> more significant change, and would result in quite strange side
effects
> such as Dimensions having Dimensions.
>
> Rob
>
> --
> Rob Sanderson
> Director for Cultural Heritage Metadata
> Yale University
>
> _______________________________________________
> Crm-sig mailing list
> [email protected] <mailto:[email protected]>
> http://lists.ics.forth.gr/mailman/listinfo/crm-sig
>
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Center for Cultural Informatics
Information Systems Laboratory
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