Page Comparison

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). (e.g. 3960 PRINCE ST)

Location in easting and northing (UTM NAD83 in meters)

Thing

Some real-world entity with which one or more Sensors are associated

Well Point ID WL-0150) - geoCoding required

Location in easting and northing (UTM NAD83 in meters)

Thing

Some real-world entity with which one or more Sensors are associated

Well Point ID WL-0150

(Thing/Property - Well Use (e.g., pumping well))

(Thing/Property - Well Status (permitted, active, capped, plugged, etc.)) → could see another use case focused on Well Status as the observed property

Sample Pt RT236I

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)

Measurement

Categorical or TruthObservation

multiDataStream if there are multiple analytes

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 http://qudt.org/)

feet (e.g. http://qudt.org/vocab/unit/FT)

TCR Result

/vocab/unit/FT)

TCR Result (binary indicator: absence/presence)

ug/l (micrograms/liter; also = ppb), mg/l (also = ppm), nTu, deg C, %, us/cm (microSiemens/centimeter), “pH” (techically dimless), rads,

Acre-Feet (e.g. http://qudt.org/vocab/unit/AC-FT)

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. If applicable, a specific instance (e.g. a sensor model and serial number)

Steel-tape measurement; Continuous acoustic sounder; e-probe; pressure transducer; airline

9223B-PA (https://www.standardmethods.org/doi/10.2105/SMWW.2882.194)

MCCROMETER Diversion Meter-Meter Number 17147

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 ODM2 Controlled Vocabularies or http://qudt.org/)

Depth to Water Below Ground Surface (BGS)

Analyte (e.g. Coliform (TCR) (3100))

Turbidity

Mtr Amount

OPTIONAL: FeatureOfInterest

The real-world feature that the Observations are about. This may or many not be different from the Location where the Thing on which the Sensor is mounted. Can include a JSON-formatted point location or a polygon or collections thereof.

Formation (e.g. https://maps.nmt.edu/maps/data/hydrograph/formation_lu)

Public Water System (head office location or service area boundary) (e.g. Albuquerque Water System PWSID NM3510701)

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

(observation/Parameter - Missing value code (e.g., if well is dry))

(observation/Parameter - Is well recovering?)

Sample (e.g. 763391)

Meter Reading

Observation/result

The actual measured value, with valid values defined in observationType and units defined in unitsOfMeasurement, both provided by Datastream

Depth (e.g. 337.08)

Sample Result (P (Positive/ Coliform found) A (Negative/ Coliform not found))

Mtr Amount (e.g. 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)

(might need to discuss this further to figure out value for entry; does coincide with entry within Drinking Water Watch)

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)

(refers to sampling time, not time of lab analysis)

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)

OPTIONAL: Observation/resultQuality

A description of the result Quality. Will vary according to agency practice. Can use ODM2 controlled vocabulary for data quality types as a guide.

Precision (e.g. “within two hundredths of a foot”)