Data set 3.

Column label	Column description
eventID	A unique identifier for the recording of a single cetacean sighting event.
measurementID	An identifier for the MeasurementOrFact (information pertaining to measurements, facts, characteristics or assertions). May be a global unique identifier or an identifier specific to the dataset.
measurementType	The nature of the measurement, fact, characteristic or assertion. See Suppl. Material 1 for a detailed description of each field.
measurementValue	The value of the measurement, fact, characteristic or assertion.
measurementMethod	A description of, or reference to (publication, URI), the method or protocol used to determine the measurement, fact, characteristic or assertion.