What are the standard reference ellipsoids used in geodesy?

The standard reference ellipsoids used in geodesy are crucial for accurate positioning and mapping. WGS84, the World Geodetic System 1984, is a widely used global reference frame that integrates satellite-based measurements and is foundational for GPS technologies. It provides a consistent framework for positioning data worldwide.

GRS80, the Geodetic Reference System 1980, was explicitly designed for the geodetic measurements and applications, offering a more precise representation of the Earth's shape. Both WGS84 and GRS80 share similar dimensions and are used in various applications, allowing for significant compatibility in geographic data and enhancing the accuracy of positioning in geodetic surveys.

Other combinations listed, though containing well-known reference ellipsoids, do not represent the current standard as accurately or as broadly applicable as the pairing of WGS84 and GRS80. Their use is limited to specific regions or applications and, while important in historical contexts, do not reflect the same global standardization. Therefore, WGS84 and GRS80 are indeed the correct pair when considering standard reference ellipsoids in contemporary geodetic practice.