geodeettisesta

Geodeettinen refers to geodesy, the science of determining the size and shape of the Earth, its gravity field and rotation, and of defining precise geographic coordinates. In Finnish, geodeettisesta is a case-inflected form used in phrases such as geodeettisesta tutkimuksesta. The field provides the mathematical models and observational methods for describing the Earth's geometry and dynamics.

Geodesy studies the Earth's figure, commonly modeled by an ellipsoid and a geoid. A geodetic datum defines a reference frame that ties coordinates to the Earth, enabling accurate mapping and navigation. Global datums include WGS84 and ITRF; regional datums include ETRS89.

Techniques include satellite geodesy, using signals from GPS, GLONASS, Galileo, and other systems, and space methods such as VLBI and SLR; terrestrial methods such as leveling, triangulation, and gravimetry are also used.

Applications range from cartography and surveying to navigation, construction, earthquake seismology, and climate studies that require precise measurements of land movement and sea level.

Historically, geodesy emerged to support astronomy, cartography, and navigation, evolving with satellite technology and global reference frames. Ongoing work aims to improve precision, continuity, and interoperability among networks through IERS and ITRS/ITRF standards.

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