[Crm-sig] Issue 498, disjoint places

Martin Doerr martin at ics.forth.gr
Sun Jun 6 21:49:36 EEST 2021


Dear All,

Here my proposal for revision of the scope note of E53 Place:


*OLD:*

E53 Place

Subclass of:

E1 <#_toc7281> CRM Entity

Scope note:

This class comprises extents in space, in particular on the surface of 
the earth, in the pure sense of physics: independent from temporal 
phenomena and matter.

The instances of E53 Place are usually determined by reference to the 
position of “immobile” objects such as buildings, cities, mountains, 
rivers, or dedicated geodetic marks, but may also be determined by 
reference to mobile objects. A Place can be determined by combining a 
frame of reference and a location with respect to this frame.

It is sometimes argued that instances of E53 Place are best identified 
by global coordinates or absolute reference systems. However, relative 
references are often more relevant in the context of cultural 
documentation and tend to be more precise. In particular, we are often 
interested in position in relation to large, mobile objects, such as 
ships. For example, the Place at which Nelson died is known with 
reference to a large mobile object – H.M.S Victory. A resolution of this 
Place in terms of absolute coordinates would require knowledge of the 
movements of the vessel and the precise time of death, either of which 
may be revised, and the result would lack historical and cultural relevance.

Any instance of E18 Physical Thing can serve as a frame of reference for 
an instance of E53 Place. This may be documented using the property 
/P157 is at rest relative to (provides reference space for)/.

*NEW:*

E53 Place

Subclass of:

E1 <#_toc7281> CRM Entity

Scope note:

This class comprises extents in *the* natural space *we live in*, in 
particular on the surface of the earth, in the pure sense of physics: 
independent from temporal phenomena and matter. *They may serve 
describing the physical location of things or phenomena or other areas 
of interest. Geometrically, instances of E53 Place constitute single 
contiguous areas or a finite aggregation of contiguous, mutually 
disjoint areas in space. They may have fuzzy boundaries.*****

The instances of E53 Place are usually determined by reference to the 
position of “immobile” objects such as buildings, cities, mountains, 
rivers, or dedicated geodetic marks, but may also be determined by 
reference to mobile objects. A Place can be determined by combining a 
frame of reference and a location with respect to this frame.

  It is sometimes argued that instances of E53 Place are best identified 
by global coordinates or absolute reference systems. However, relative 
references are often more relevant in the context of cultural 
documentation and tend to be more precise. In particular, we are often 
interested in *positions* in relation to large, mobile objects, such as 
ships. For example, the Place at which Nelson died is known with 
reference to a large mobile object – H.M.S Victory. A resolution of this 
Place in terms of absolute coordinates would require knowledge of the 
movements of the vessel and the precise time of death, either of which 
may be revised, and the result would lack historical and cultural relevance.

Any instance of E18 Physical Thing can serve as a frame of reference for 
an instance of E53 Place. This may be documented using the property P157 
is at rest relative to (provides reference space for).

-- 
------------------------------------
  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: martin at ics.forth.gr
  Web-site: http://www.ics.forth.gr/isl

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