Geodetische

Geodetische refers to aspects of geodesy, the science concerned with measuring and understanding the Earth's shape, its orientation in space, and its gravity field. Geodesy seeks to define reference frames for positions on and near the Earth's surface, and to determine the precise geometry of the planet.

Key concepts in geodetische include the reference ellipsoid, a mathematical model of Earth's shape; the geoid, an equipotential surface that approximates mean sea level; and datums, which tie measurements to a defined coordinate system. Geodetic coordinates such as latitude, longitude, and height rely on these models. Cartesian coordinates (X, Y, Z) are used in space-fixed reference frames.

Geodetische practice combines classical surveying techniques with modern space-geodetic methods. Traditional methods include triangulation, trilateration, and leveling. Contemporary approaches employ global navigation satellite systems (GNSS) such as GPS, GLONASS, Galileo, and BeiDou, as well as very-long-baseline interferometry (VLBI), satellite laser ranging (SLR), and gravimetric measurements. These techniques enable the precise determination of positions, time standards, and the continuous evolution of reference frames.

Applications of geodetische work span many fields. They include topographic mapping, construction and engineering, cadastral surveying, and navigation. In science, geodesy supports geophysics and Earth observation by monitoring crustal motion, sea-level change, and gravity-field variations. Ongoing efforts focus on maintaining and improving global and regional reference frames, refining accuracy, and modeling temporal changes in the Earth's shape and gravity field.