geodeettisella

Geodeettinen (geodetic) refers to the science of geodesy and to the related methods, data, and applications used to measure and understand the Earth's shape, gravity field, and orientation in space. Geodesy seeks to determine the size and form of the Earth, the positions of points on its surface, and how those points move over time. It underpins accurate mapping, navigation, construction, and Earth science.

Geodetic practice combines classical surveying techniques with modern space-based methods. Traditional work includes leveling, triangulation, and gravimetric measurements, while contemporary approaches rely on satellite geodesy such as global navigation satellite systems (GNSS), very-long-baseline interferometry (VLBI), satellite laser ranging (SLR), and Doppler orbitography and radiopositioning (DORIS).

Key concepts include reference frames and datums (global like the International Terrestrial Reference Frame, ITRF, and WGS84, and national/datums), coordinate systems, and vertical datums tied to the geoid—the approximate mean sea level surface extended through the continents. Geoid models enable conversion between ellipsoidal heights and physical heights.

Applications span mapping and cadastral surveying, precision engineering, satellite navigation, and monitoring of crustal movement, sea level change, and gravity-field variations. Geodesy also supports geophysical research, such as studying plate tectonics, earthquakes, and water storage.

Organizations such as the International Association of Geodesy (IAG) and IERS coordinate standards and data sharing, while services like the IGS provide real-time GNSS data. The field continues to evolve with improved accuracy, time-variable reference frames, and holistic integration of terrestrial and space-based observations.