Schema

Measurement

Type: Blank Node

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A Measurement on a Site. For example, the pH of soil on 3 January 2020. The method used to take the Measurement often changes the results, and is ideally described.

Field Type Required Definition
term Term Yes

A reference to the Term describing the Measurement.
description string No

A short description of the Measurement.
value array[number|null] No

The quantity of the Measurement. If an average, it should always be the mean. Can be a single number (array of length one) or an array of numbers with associated dates (e.g. representing multiple Measurements over time).

sd array[number|null] No

The standard deviation of value.
min array[number|null] No

The minimum of value.
max array[number|null] No

The maximum of value.
statsDefinition string No

What the descriptive statistics (sd, min, max, and value) are calculated across, or whether they are simulated or the output of a model. Spatial is descriptive statistics calculated across spatial units (e.g., pixels) within a region or country.

Possible values are: sites,replications,otherObservations,time,spatial,regions,simulated,modelled
observations array[number|null] No

The number of observations the descriptive statistics are calculated over.
dates array[string] No

A corresponding array to value, representing the dates (and times) of the Measurements in ISO 8601 format (YYYY-MM-DD, YYYY-MM, YYYY, --MM-DD, --MM, or YYYY-MM-DDTHH:mm:ss).

startDate string No

For period Measurements, the start date of the Measurement (if different from the start date of the Site) in ISO 8601 format (YYYY-MM-DD, YYYY-MM, or YYYY).

endDate string No

For period Measurements, the end date of the Measurement (if different from the end date of the Site) in ISO 8601 format (YYYY-MM-DD, YYYY-MM, or YYYY).

measurementDuration number No

The duration of the Measurement in days.
depthUpper number No

For soil Measurements, the upper (shallower) depth of the Measurement interval in centimeters, using positive numbers.

depthLower number No

For soil Measurements, the lower (deeper) depth of the Measurement interval in centimeters.

latitude number No

The latitude of the Measurement if different from the centroid of the Site (-90 to 90, WGS84 datum).

longitude number No

The longitude of the Measurement if different from the centroid of the Site (-90 to 90, WGS84 datum).

properties List[Property] No

A list of Properties of the Measurement, which would override any default properties specified in term.

methodModel Term No

A reference to the Term describing the method or model used to acquire the measurement.
methodModelDescription string No

A free text field describing the method or model used to acquire the Measurement.
source Source No

A reference to the Source of these data, if different from the defaultSource of the Site.

Internal Properties

Field Type Definition
@type string Measurement
schemaVersion string

Version of the schema when the data was created.
added array[string]

A list of fields that have been added to the original dataset.
addedVersion array[string]

A list of versions of the model used to add these fields.
updated array[string]

A list of fields that have been updated on the original dataset.
updatedVersion array[string]

A list of versions of the model used to update these fields.
aggregated array[string]

A list of fields that have been 'aggregated' using data from multiple Sites.
aggregatedVersion array[string]

A list of versions of the aggregation engine corresponding to each aggregated field.

JSON-LD Example 1

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JSON-LD Example 2

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