Datumreferentie

Datumreferentie is a term used in Dutch to indicate the point in time or the reference frame from which dates or measurements are taken. The exact meaning depends on the domain, but it generally denotes the origin or basis used for subsequent data.

In time-related data, the datumreferentie serves as the origin for all time stamps in a dataset. This can be a calendar date such as 1970-01-01 (the Unix epoch) or a specific project baseline date. All subsequent dates are stored as offsets or absolute dates relative to that reference. Using a clear datumreferentie allows consistent interpretation and comparison of time-based information.

In geospatial contexts, datum refers to a geodetic reference frame that defines the shape and size of the Earth and the position of the coordinate axes. The datumreferentie in this sense specifies the geodetic datum used for coordinates (for example WGS84, NAD83). Without a clearly stated datumreferentie, coordinates can be misinterpreted when transformed or integrated with other data, leading to location errors.

In metadata and data standards, the datumreferentie should be explicitly stated. It ensures reproducibility, comparability, and correct transformations across systems. Datasets often include a field for the datumreferentie or for the Coordinate Reference System, making the reference transparent to users and processors.

Summary: The term covers both the time-origin concept and the geodetic reference for coordinates. The exact meaning depends on the domain, and clear documentation of the datumreferentie is essential for accurate data use.