Dear All,
Here my attempt to reduce the confusion about STVs:-[
Comments welcome!
Martin
OLD:
E92 Spacetime Volume
Subclassof: E1 <#_E1_CRM_Entity> CRM Entity
Superclass of: E4 <#_E4_Period>Period
E18 <#_E18_Physical_Thing>Physical Thing
E93 <#_E93_Presence>Presence
Scopenote:This class comprises 4 dimensional point sets (volumes) in
physical spacetime regardless its true geometric form. They may derive
their identity from being the extent of a material phenomenon or from
being the interpretation of an expression defining an extent in
spacetime. Intersections of instances of E92 Spacetime Volume, Place and
Timespan are also regarded as instances of E92 Spacetime Volume.An
instance of E92 Spacetime Volume is either contiguous or composed of a
finite number of contiguous subsets. Its boundaries may be fuzzy due to
the properties of the phenomena it derives from or due to the limited
precision up to which defining expression can beidentified with a real
extent in spacetime. The duration of existence of an instance of a
spacetime volume is trivially its projection on time.
Examples:
·the spacetime Volume of the Event of Caesar’s murder
·the spacetime Volume where and when the carbon 14 dating of the
"Schoeninger Speer II" in 1996 took place
·the spatio-temporal trajectory of the H.M.S. Victory from its building
to its actual location
·the spacetime volume defined by a polygon approximating the Danube
river flood in Austria between 6^th and 9^th of August 2002
In First Order Logic:
E92(x) ⊃E1(x)
Properties:
P10 <#_P10_falls_within_(contains)>falls within (contains): E92
<#_E91_Co-Reference_Assignment>Spacetime Volume
P132 <#_P132_overlaps_with>spatiotemporally overlaps with: E92
<#_E91_Co-Reference_Assignment>Spacetime Volume
P133 <#_P133_is_separated_from>spatiotemporally separated from: E92
<#_E91_Co-Reference_Assignment>Spacetime Volume
P160 <#_P160_(Px5)_> has temporal projection: E52 <#_E52_Time-Span>
Time-Span
P161 <#_P161_(Px6)_> has spatial projection: E53 <#_E53_Place> Place
**
*NEW*
E92 Spacetime Volume
Subclassof: E1 <#_E1_CRM_Entity> CRM Entity
Superclass of: E4 <#_E4_Period>Period
E18 <#_E18_Physical_Thing>Physical Thing
E93 <#_E93_Presence>Presence
Scopenote:This class comprises sets of 4 dimensional points forming
contiguous volumes in physical spacetime, as understood in physics. They
may derive their identity from being the extent of a material phenomenon
or from being the application of a geometric expression defining an
extent in spacetime. Intersections of instances of E92 Spacetime Volume,
Place and Timespan are also regarded as instances of E92 Spacetime
Volume.An instance of E92 Spacetime Volume is either contiguous or
composed of a finite number of contiguous subsets. Its boundaries may be
fuzzy due to the properties of the phenomena it derives from or due to
the limited precision up to which defining expression can beidentified
with a real extent in spacetime. The duration of existence of an
instance of a spacetime volume is trivially its projection on time.
Volumes in spacetime are not easy to be imagined and most users of the
CRM may not be concerned with them, using only indirectly E92 Spacetime
Volume via its phenomenal subclasses, such as E4 Period. E92 Spacetime
Volume should not directly be instantiated to describe such items having
a phenomenal identity. Nevertheless, the class forms part of the logical
foundations of the CRM and is basic for the logic of reconstructions of
stages of buildings, things contained in mobile things and others. It is
a fundamental construct to describe and reason about topological and
chronological relationships and forms the primary logical connection of
the CRM to the standards of the georeferencing communities[1]. E92
Spacetime Volume may directly be instantiated to describe approximations
of the confinement of phenomenal items using the property/P169 defines
spacetime volume (spacetime volume is defined by),/typically by defining
extents in space being constant for some time-span. Such approximations
must not be confused with the actual extent and identity of the
respective items. In the definition of spacetime volumes for confining
things happening on Earth, the altitudinal extent is normally omitted.
The best intuition about a point in spacetime is like the “when and
where” of a microscopic event. It can be referred to by combinations of
space and time coordinates, such as (37°58'17.14"N, 23°43'35.72"E,
156.5m a.s.l., 26/9/1687 12:00), but seen under different reference
systems of space and time the values to refer to the /same point/ will
differ. The point itself nor a volume of such points are relative to any
reference system. A good intuition about a volume in spacetime is that
of a temporary extent in space, possibly moving and changing, such as
the inner of a soap bubble or of an airplane, or the water-filled volume
of a technical lake over one year.
Examples:
·the spacetime volume defined by a polygon approximating the Danube
river flood in Austria between 6^th and 9^th of August 2002
·the area ruled and controlled by Qin Shi Huan from 7 May 247 BC to 10
September 210 BC (E4)
·the spacetime volume when and where Caesar’s murder took place from the
first stabbing to burning his corpse (E7,E69)
·the spacetime volume when and where the carbon 14 dating of the
"Schoeninger Speer II" in 1996 took place (E16)
·the spatio-temporal trajectory of the H.M.S. Victory from its building
to its actual location (E18)
In First Order Logic:
E92(x) ⊃E1(x)
Properties:
P10 <#_P10_falls_within_(contains)>falls within (contains): E92
<#_E91_Co-Reference_Assignment>Spacetime Volume
P132 <#_P132_overlaps_with>spatiotemporally overlaps with: E92
<#_E91_Co-Reference_Assignment>Spacetime Volume
P133 <#_P133_is_separated_from>spatiotemporally separated from: E92
<#_E91_Co-Reference_Assignment>Spacetime Volume
P160 <#_P160_(Px5)_> has temporal projection: E52 <#_E52_Time-Span>
Time-Span
P161 <#_P161_(Px6)_> has spatial projection: E53 <#_E53_Place> Place
------------------------------------------------------------------------
[1] <#_ftnref1>Hiebel, OGC…
M
--
------------------------------------
Dr. Martin Doerr
Honorary Head of the
Center for Cultural Informatics
Information Systems Laboratory
Institute of Computer Science
Foundation for Research and Technology - Hellas (FORTH)
N.Plastira 100, Vassilika Vouton,
GR70013 Heraklion,Crete,Greece
Vox:+30(2810)391625
Email: [email protected]
Web-site: http://www.ics.forth.gr/isl
