Dynamic datums

Meta Trend	Spatial and Temporal Models
Title	Dynamic datums
Description	This is now starting to be referred to as an “Earth-fixed” datum but previously was often referred to as a “dynamic datum”. Conceptually, the term “dynamic datum” confuses many people, who assume it to mean that the datum itself is constantly changing. This is obviously not the case – the datum is uniquely defined and fixed in orientation and location. Rather, an “Earth-fixed” datum allows the changes in coordinates of points on the Earth’s “dynamic” surface to be referenced and represented. (ANZLIC). The revision of ISO 19111 anticipates the need for Dynamic Datums.
What is new or emerging?
Why might it matter?
Horizon	After Next: Standards have been developed (ISO 19111) but the need and the implementations are not yet available.
Impact	Sustaining: Dynamic datums are a technical challenge that can be addressed without disruption of markets.
Gartner Hype Curve phase
Technology Readiness Level	TRL-3 in OGC activities.
Discussion Issue	Discussion of Trend on GitHub
References	- Implications of a Dynamic Datum on the Cadastre - ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions
Examples	URL to technology implementation examples
Geospatial Tech Category	Databases, Data models, Semantics, Mark-up Languages
OGC Working Groups	OGC CRS DWG

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