Issue 388: Reference to the measurements of position of things
posted by Athinak on 13/7/2018
In CRMsci, we need a reference to the measurements of the positions of things, in terms of place geometries that are measured and calculated by this kind of activities. So, a first idea is to extend the model to include a Measurement Position Activity that produces a geometric place definition in gml terms (which also may include the place of the possible sampling activities).
So, a proposal for a new class:
Subclass of: S21 Measurement/S3 Measurement by Sampling
This class comprises activities of measuring the positions of instances of E2 Temporal Entity or E77 Persistent Items, (properties of physical things, or phenomena, states and interactions or events), e.g during a sampling activity, that can be determined by a systematic procedure.
During a Sampling Event that takes place, the scientist in order to collect samples and observe the occurrences (encounter events) in the specific area, keeps the information about the area of sampling by a number of measurements. By these area measurements, also encounter events volumes can be calculated. Furthermore, the volume of the sampling event can also be calculated.
All these related processes can be modelled by a Position Measurement activity that produces a Geometric Place Definition, which includes the Phenomenal Place in which the Sampling Activity took place.
Properties: produces: Geometric Place Definition?/or SP5 Geometric Place Expression: Q10 defines place: SP6 Declarative Place
In the 43rd joint meeting of the CIDOC CRM SIG and ISO/TC46/SC4/WG9; 36th FRBR - CIDOC CRM Harmonization meeting, the sig reviewed the new class proposed by AK Position Measurement and accepted it as a starting point. However, it was proposed that the class be a subclass of S3 Observation rather than an S21 Measurement OR S3 Measurement by Sampling.
Furthermore, it was suggested (MD) that the definition of this class be cast as a situation measurement instead (i.e. that it should generalize to both space and time). It should measure phenomenal places that have acquired their identity through some observation event, while providing approximations for these phenomenal places. Finally, it should carry over to measuring the time of observation events.
HW: AK to revisit bearing in mind the sig’s comments.
Heraklion, MArch 2019
Posted by Martin on 1/6/2019
Here my proposal for the position measurement. I believe we need a third special kind of measurement, something like a "spot measurement", which would provide properties within a continuum, such as atmosphere, river, ground, or sensors immersed in an object.
Sxxx Position Measurement
Subclass of: E16 Attribute Assignment
Scope note: This class comprises activities of measuring the positions of instances of E18 Physical Thing in space and time. The position is given as an E94 Space Primitive corresponding to a declarative place approximating the intended real position and the time of the measurement itself. The measured thing may either be the measurement device itself, such as a theodolite or GPS device, a permanent survey mark, a volume containing an E18 Physical Thing or an arbitrary spot on or within an E18 Physical Thing. The respective position and time may be used to document the presence of an E18 Physical Thing at some time or indirectly the presence of an instance of E4 Period, in particular events of scientific observation and their spatial focus.
Oxx1 determined position (was determined by): E94 Space Primitive
Oxx2 covered thing: E18 Physical Thing
Oxx3 covered event: E4 Period
Oxx4 fell within thing: E18 Physical Thing
Oxx5 fell within event: E4 Period
The idea being, that the “covered thing” was completely present within the given space and time.
If we would talk only about spacetime volumes, this could not be expressed.
To be checked how to connect to sampling spots within the volume of a measurement activity.