Geodetic Reference System 1980

Geodetic Reference System 1980 (GRS80) is a geocentric reference system that is widely used in modern mapping and surveying. It is based on a reference ellipsoid and is used to determine latitude and longitude coordinates on the Earth's surface. GRS80 is commonly used in North America for mapping and surveying purposes.From: Map of the World [2019], Gravity survey of the central Alpine Fault near the DFDP-2 drill site, Whataroa, South Island, New Zealand [2020], Global Navigation Satellite Systems [2021]

Co-ordinate reference systems

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Published in Martin Vermeer, Antti Rasila, Map of the World, 2019

Martin Vermeer, Antti Rasila

Geodetic Reference System 1980 (GRS80) was approved by the IUGG, the International Union of Geodesy and Geophysics, in its General Assembly of 1979 in Canberra, Australia. Its defining parameters (e.g., Heikkinen, 1981) are presented in Table 10.1.

A new basin depth map of the fault-bound Wellington CBD based on residual gravity anomalies

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Published in New Zealand Journal of Geology and Geophysics, 2023

Alistair Stronach, Tim Stern

Bouguer anomalies gba (Figure 2(A)) are the difference between calculated and observed gravity at each station (Kearey et al. 2002): and calculated gravity is (Kearey et al. 2002): where is the gravity calculated from the 1980 international gravity formula for a station’s latitude on the Geodetic Reference System 1980 ellipsoid (Hinze et al. 2005), is the free air correction, is the Bouguer plate correction, is the terrain correction and is the building correction. The free air correction was made assuming a vertical gravity gradient of −0.3086 mGal/m. The Bouguer plate correction was calculated using an assigned crustal density of 2.67 Mg/m3.

Geodetic Reference System 1980

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Co-ordinate reference systems

A new basin depth map of the fault-bound Wellington CBD based on residual gravity anomalies