Table of Contents
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SensorThings Entity | Description | Example: NMBGMR Aquifer Monitoring Well | |||
|---|---|---|---|---|---|
Metadata | Location | A unique coordinate or area on the surface of the earth | Location in latitude and longitude or UTM easting and Northing (UTM Zone 13, NAD83) | Street Address (possibly with associated latitude and longitude) | Location in easting and northing (UTM NAD83 in meters) |
Thing | Some real-world thing with which one or more Sensors are associated | Well Point ID WL-0150 | Sample Pt RT236I | Sampling Point of Diversion POD Number A 00008 AS | |
Datastream | A collection of Observations about an ObservedProperty produced by a Sensor associated with a Thing | Time series, Hydrograph | Sample Results | Meter Readings (Quarterly) | |
Datastream/observationType | The type of observation, codified in the Observations and Measurements data standard. Types include Categorical (defined text), Count (integer), Measurement (continuous number), Observation (free text), and TruthObservation (True/False) continuous number (Measurement) | Measurement | Categorical or TruthObservation | Measurement | |
Datastream/unitOfMeasurement | A three-item definition of the unit of measurement, including its name, symbol, and link to the definition (preferably to one provided in an established ontology such as http://unitsofmeasure.org/ucum.html or the CUAHSI controlled vocabularies) | feet below ground surface (ft BGS) | TCR Result | Acre-Feet | |
Sensor | The procedure used to provide a Datastream. Can be a particular data recording device model, or a defined procedure followed by a human observer. | Steel-tape measurement; Continuous acoustic sounder | 9223B-PA (https://www.standardmethods.org/doi/10.2105/SMWW.2882.194) | MCCROMETER Diversion Meter | |
ObservedProperty | The raw or processed phenomenon (quantitative or qualitative) being measured for the Datastream. Preferably including a link to a definition provided by an established ontology or controlled vocabulary such as the CUAHSI controlled vocabularies) | Depth to Water | Analyte (e.g. Coliform (TCR) (3100)) | Water withdrawn | |
OPTIONAL: FeatureOfInterest | The real-world feature that the Observations are about. This may be different from the Thing on which the Sensor is mounted. Can be a point location or a polygon or collections thereof. | Aquifer (polygon) | Public Water System (head office location or service area boundary) (e.g. Albuquerque Water System) | Water Right (set of relevant points of diversion) | |
Data | Observation | A single measurement value including the result, time values, and other metadata. Information on the ObservedProperty that was measured by what Sensor is provided by the Datastream these observations are in. Features of Interest are linked for each observation as well. Observations are linked to (collected in) Datastreams | Depth measurement | Sample No. (e.g. https://dww.water.net.env.nm.gov/DWW/JSP/TCRFieldResults.jsp?tinwsys_is_number=35&tinwsys_st_code=NM&tsasampl_is_number=763391&tsasampl_st_code=NM | Mtr Amount |
Observation/result | The actual measured value, with valid values defined in observationType and units defined in unitsOfMeasurement, both provided by Datastream | 337.08 | P (Positive/ Coliform found) A (Negative/ Coliform not found) | 107.948 | |
Observation/phenomenonTime | The date+time (or interval) in ISO 8601 format (YYYY-MM-DDT:HH:MM:SS-Z) when the observation occured | 2019-01-31 00:00:00 | MP (Monitoring Period) (e.g. 01-01-2020 to 01-31-2020) | 1/20/2017-04/05/2017 (Quarterly period for which volume was measured) | |
OPTIONAL: Observation/resultTime | The date+time that the result was generated. May be the same as phenomenonTime | Date (e.g 01-06-2020) | 04/05/2017 (date of meter reading) | ||
OPTIONAL: Observation/validTime | The date+time interval during which the Observation can be used (often used for provisional values that are replaced by QA/QC’d observations) |
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