[Crm-sig] Issue 347 Dimension

Martin Doerr martin at ics.forth.gr
Thu Nov 15 15:53:51 EET 2018

Dear All,

Here my homework!

    ISSUE 347

The sig discussedMartin's proposal about the relaxation of definition of 
E54 to either representing the approximation of a true quantity of a 
thing or phenomenon provided by a measurementor a derived quantity 
computed indirectly from observation data comparable to reality, or a 
quantity produced by simulation of reality-like situations.

Some comments are:

·the phrase "An instance of E54 Dimension is specific to an instance of 
E70 Thing" in the scope note of P43 is too specific and it is 
notcompatible with the above approach. There are some consequences of 
this approach.

·We should consider the properties of a physical thing.

A conclusion was that closeness or overlap of given bounds of 
approximation are the means to reason on the compatibility with a common 
reality or item.Arrays and time series are regarded as “complex” dimensions.

The SIG assigned to MD to rewrite the scope note of E54.

*Here it is, a bit lengthy I admit:*

      E54 Dimension

Subclass of:E1 <#_E1_CRM_Entity>CRM Entity

Scope note:This class comprises quantifiable properties of things or 
phenomena that can be measured by some calibrated means and can be 
approximated by values, i.e. points or regions in a mathematical or 
conceptual space, such as natural or real numbers, RGB values etc.

  An instance of E54 Dimension may represent either the result of a 
measurement of a quantity of some things or phenomena, or the result of 
an evaluation of observation data indirectly determining an 
approximation of such a quantity, or the result of a prediction or 
hypothetical simulation of such a quantity in a scenario of a possible 
or alternative evolution of reality. Quantifiable properties of 
conceptual objects are observed on representative carriers. Not only 
dimensions of persistent items can be quantifiable, but also durations, 
spatial and temporal distances of instances of E2 Temporal Entities.

Most quantifiable properties change over time and have a continuous 
value space. Therefore, multiple observations will differ from each 
other, but knowledge about the precision of the respective determination 
method and domain knowledge about the changes to be expected between 
observations allow for reasoning which results of multiple observations 
are compatible with a common reality and can be used for further 
approximating the real quantities. For instance the weight of a person 
varies in the course of the day in a kg range. Wood expands under 
humidity some per cents, metal much less under increasing temperature. 
Instances of E54 Dimensions are specific to the way a property is 
determined. For instance, the length of a museum objects determined by 
the smallest rectangular bounding box is different from the maximum 
length of the object.

The properties of the class E54 Dimension allow for expressing the 
numerical approximation of the values of an instance of E54 Dimension. 
If the true values belong to a non-discrete space, such as spatial 
distances, it is recommended to record them as approximations by 
intervals or regions of indeterminacy enclosing the assumed true values. 
For instance, a length of 5 cm may be recorded as 4.5-5.5 cm, according 
to the precision of the respective observation. Note, that 
interoperability of values described in different units depends 
critically on the representation as value regions. For instance, 5cm is 
about 1.96850394 inches. 2 inches on the other side may be interpreted 
as something between 1.5-2.5 inches, which would be something within 
3.5-6.5 cm.

Numerical approximations in archaic instances of E58 Measurement Unit 
used in historical records should be preserved. Equivalents 
corresponding to current knowledge should be recorded as additional 
instances of E54 Dimension as appropriate.


§The 250 metric ton weight of the Luxor Obelisk


§The 5.17 m height of the statue of David by Michaelangelo


§The 530.2 carats of the Great Star of Africa diamond


§The AD1262-1312, 1303-1384 calibrated C14 date for the Shroud of Turin


§The 33 m diameter of the Stonehenge Sarcen Circle


§The 755.9 foot length of the sides of the Great Pyramid at Giza

§Christies’ hammer price for “Vase with Fifteen Sunflowers” (E97) has 
currency British Pounds (E98)

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

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