Static vs dynamic datumĪll current and historic datums in Australia have been defined as being “fixed” or static to the Australian tectonic plates. The Geocentric Datum of Australia (GDA94 and GDA2020) are examples of this. Geocentric Datums consist of a reference surface (or Ellipsoid) which uses the centre of the Earth’s mass as the base-point reference. Historical datums such as the Australian Geodetic Datum (AGD66, AGD84) were examples of a geodetic datum, as they best defined the shape and location of Australia in isolation from the rest of the world. Geodetic Datums consist of a reference surface (or Ellipsoid), a coordinate system and a set of defined reference points to define a “best fit” to the earth’s surface over that part of the Earth. In Australia, we have historically had two types of datums – Geodetic Datums and Geocentric Datums. There are many different datums worldwide, used to translate positions indicated on maps to their real position on Earth. The beginning is always a pretty good place to start, so in this post, we’ve distilled the highlights to explain what a geocentric datum is and its relevance to asset management systems and processes. The Intergovernmental Committee on Surveying and Mapping (ICSM – the body responsible for overseeing the datum modernisation) has published an excellent set of Frequently Asked Questions that will help you get to the bottom of all things GDA2020. To understand exactly what is happening and why, it helps to have a handle on some of the key concepts involved. From January this year, the process of replacing GDA94 with GDA2020 officially began with the aim of bringing Australia’s national latitude and longitude coordinates into line with global satellite positioning systems. Which is why we’ve been having lots of conversations lately about the modernisation of Australia’s geocentric datum. When you need to maintain kilometres of underground pipeline, or service submarine communication cables, being able to pinpoint the location of access points with a high degree of accuracy can have a huge impact on the effectiveness of your entire operation.Īs enterprise asset management specialists with spatial and geomatics expertise, the crew here at Clarita are keen on helping our clients do exactly that. Location plays a big part in managing assets.
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