ssn:Property
The ssn:Property class represents observable or measurable characteristics of real-world entities. In SDL, ssn:Property is used to define what is being observed by a system or sensor, such as temperature, pH, or conductivity.
Definition
URI: http://www.w3.org/ns/ssn/Property
A ssn:Property is an aspect of an entity that can be observed or measured by a sensor or computation.
Usage in SDL
In SDL, ssn:Property is used to:
- Define the type of phenomenon being observed
- Drive consistency across observation data
- Enable semantic alignment with domain ontologies and units
A ssn:Property is typically linked from sosa:Observation using sosa:observedProperty, and from ssn:System using ssn:forProperty.
Properties
| Property | Description | Optional |
|---|---|---|
| dcterms:identifier | A unique ID for the property | Yes |
| dcterms:title | A human-readable label | Yes |
| dcterms:description | Free-text description of what the property measures | Yes |
| rdfs:subClassOf | Optional semantic classification from a domain ontology | Yes |
| skos:exactMatch | External URI that semantically matches the property | Yes |
Composition and Relationships
Properties are used in both observation and deployment models:
ex:temperature a ssn:Property ;
dcterms:title "Air Temperature" ;
skos:exactMatch <http://qudt.org/vocab/quantitykind/Temperature> .
ex:obs123 a sosa:Observation ;
sosa:observedProperty ex:temperature ;
sosa:hasResult ex:result42 .
Common Properties in SDL
Here are some common properties used in SDL:
ex:co2— CO₂ concentration (QUDT: MolarConcentration)ex:ph— Soil or water pH (QUDT: Acidity)ex:temperature— Air or soil temperature (QUDT: Temperature)ex:moisture— Soil volumetric water content (QUDT: MoistureContent)- Plant specific Properties
- Observational Properties based on PlantCV
- Solid State Chemistry Specific Properties
Related Classes
- sosa:Observation — uses sosa:observedProperty
- ssn:System — configured to detect specific ssn:Property
- qudt:QuantityKind — semantic alignment to units and scientific meaning
See Also
ssn:Property connects what is being sensed to a shared semantic understanding — a foundation for interoperable scientific data.