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Re: [emergency] Illogical Naming was: Re: [emergency] Sensors and Systems Charter Starting Point

  • 1.  Re: [emergency] Illogical Naming was: Re: [emergency] Sensors and Systems Charter Starting Point

    Posted 07-15-2005 18:07
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    Subject: Re: [emergency] Illogical Naming was: Re: [emergency] Sensors and Systems Charter Starting Point


    Perhaps, as Elysa suggests, we do need to step back and define what we mean by a sensor and a "sensed" event - or measurement - but I am sure that this will also create a dialogue. As with most standards work, one needs to start with agreement on semantics - terms, definitions and/or vocabulary. This is often the most difficult aspect of standards development!
     
    Anyway, in the OGC membership, we have a very large group of sensor technology providers and users. The following are some definitions agreed to by the OGC membership. They may be of use.
     
    1. Sensor

    An entity capable of observing a phenomenon and returning an observed value. A sensor can be an instrument or a living organism (e.g. a person), but herein we concern ourselves primarily with modelling instruments, not people.

    1. 4.12 Sensor Model

    In line with traditional definitions, a sensor model is a type of Location Model that allows one to georegister observations from a sensor (particularly remote sensors).

    1. 4.13 (Sensor) Platform

    An entity to which can be attached sensors or other platforms. A platform has an associated local coordinate frame that can be referenced to an external coordinate reference frame and to which the frames of attached sensors and platforms can be referenced.

    1. 4.4 Measurement

    An instance of a procedure to estimate of the value of a natural phenomenon, typically involving an instrument or sensor. This is implemented as a dynamic feature type, which has a property containing the result of the measurement. The measurement feature also has a location, time, and reference to the method used to determine the value. A measurement feature effectively binds a value to a location and to a method or instrument.

    1. 4.5 Observed Value

    A value describing a natural phenomenon, which may use one of a variety of scales including nominal, ordinal, ratio and interval. The term is used regardless of whether the value is due to an instrumental observation, a subjective assignment or some other method of estimation or assignment.

    Have at it!

    Carl