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.
Examples:
§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
Vox:+30(2810)391625
Email: mar...@ics.forth.gr
Web-site: http://www.ics.forth.gr/isl
