System is a composite component containing sub-components. If the member observations have the same observed property, the same sampling time, and features of interest that comprise elements of a larger feature, this may be represented as a DiscreteCoverageObservation (sub-clause 6.3.3.3) whose feature of interest is the larger feature, and within which the result elements’ geometry describe its spatio-temporal decomposition. Example: The feature of interest is an array of stations, which may be on a grid; or an array of pixels, which comprise a scene. A PropertyTypeSeries applies one or more constraintLists to the base property-types, each providing a set of values for a single secondary axis. Example: A radiance spectrum may be based on radiance with a list of wavelength intervals specified. A CompoundPropertyType has several components, whose count is indicated by the dimension. CompoundPropertyType is an abstract class. Two concrete specializations are provided. 0 Result is an estimate of the value of some property generated by a known procedure. A ConstrainedPropertyType modifies a base property-type by adding singleConstraints, each specifying a value on some secondary axis. Example: water temperature has the base temperature (i.e. it is a kind of temperature) constrained so that the property substance has the value water. Surface water temperature might add another constraint that depth is between 0 - 0.3m. Simple atomic process defined using a ProcessMethod. Process with no inputs representing a source of data (Tables, Observations ...) for other processes to connect to. Process is a method, algorithm or instrument, or system of these. Property Type is a concept that is a characteristic of one or more feature types, the value for which may be estimated by application of some procedure in an observation. Synonym for phenomenon in this specification. If the member observations have the same feature of interest, the same observed property, and different sampling times, this may be transformed into a TimeSeriesObservation (sub-clause 6.3.3.3) whose sampling time is the period encompassing all the member times. Example: Air-temperature at a weather station; water quality observations at a water monitoring station. If the member observations have the same feature of interest, the same sampling time, and different observed properties, this may be represented as a ComplexObservation (sub-clause 6.3.3.2) whose observed property compounds the individual properties. Example: A multi-band spectral radiance; a compound observable like weather; a tensor property like earthquake moment. Process formed by chaining sub-processes. Atomic SensorML Component. A CompositePropertyType is composed of a set of component property-types. The components may not be related to each other, though useful compound property-types would usually have some semantic coherence. The optional base property-types allows for the CompositePropertyType to be generated by adding components to a base. Observation is an act of observing a property or phenomenon, with the goal of producing an estimate of the value of the property. A specialized event whose result is a data value. Feature is an abstraction of real world phenomena. Under certain conditions of homogeneity, the information in an observation collection may be captured in a compound observation type, as described in sub-clause 6.3.3. An ObservationCollection is composed of a set of member observations. Coverage is a feature that acts as a function to return values from its range for any direct position within its spatiotemporal domain sensor procedure The procedure is the description of a process used to generate the result. It must be suitable for the observed property. NOTE: At this level we do not distinguish between sensor-observations, estimations made by an observer, or algorithms, simulations, computations and complex processing chains. instrument method The feature type defines its set of properties, which for the current purposes may be divided into those properties whose value is assigned by some rule or assertion (e.g. name, ownership), and those properties whose value is determined by observation. Hence, the feature-of-interest must carry the observed property as part of the definition of its type. property carrierOfCharacteristic Inverse of procedure. A CompositePropertyType is composed of a set of component property-types. The components may not be related to each other, though useful compound property-types would usually have some semantic coherence. The resultTime is the time when the procedure associated with the observation act was applied. Determinand is a parameter or a characteristic of a phenomenon subject to observation. Synonym for observable. Measurand is a physical parameter or a characteristic of a phenomenon subject to a measurement, whose value is described using a Measure (ISO 19103). Subset of determinand or observable. parameter determinand measurand observable An ObservationCollection is composed of a set of member observations. The samplingTime is the time that the result applies to the feature-of-interest. This is the time usually required for geospatial analysis of the result. The featureOfInterest is a feature of any type (ISO 19109, ISO 19101), which is a representation of the observation target, being the real-world object regarding which the observation is made. The base association indicates a conceptual relationship, which may be useful in classification of observation types. The value of a specialised property-type must be described using a scale (units of measure, vocabulary) that could also be used for the base. Example: an application may choose to include observations of WaterTemperature when the subject of interest is observations of Temperature. The observedProperty identifies or describes the phenomenon for which the observation result provides an estimate of its value. It must be a property associated with the type of the feature of interest. measurand variable parameter observed property Result is an estimate of the value of some property generated by a known procedure. value measurement value observation value result degree fahrenheit miles per hour meters percentage inches cm