Higher geodesy
higher geodesy (English. Geodesy) is that fundamental part of the geodesy, which with the spacious earth figure (form of the earth, Geoid, rotation) and the Earth's gravity field is concerned.
The associated measurements are accomplished terrestrial, with earth satellites and quasars. Their evaluation is based upand the definition, realization and transformation of global and local coordinate systems requires geometrical and physical theories.
Recently the work area of the H.G. stretches. also on near earth space out particularly on moon and Mars (see also Selenodäsie, “Areodäsie” and/or. Planetary geodesy, Planetologie).
The name higher geodesy developed contrary to low geodesy, like one in former times engineer geodesy called (English: Surveying). With the latter one can regard the measurements - Operate still without loss of accuracy as even.
In higher geodesy and the land surveying is however those To always consider Earth's curvature. It constitutes scarcely 1 mm in the height on 100 m, with 1 km already 8 cm. The influences on the situation - measurement become only with somewhat larger distances apparent.
Higher geodesy is divided into some ranges, thosehowever partly overlap. The following organization is usual:
- Mathematical and astronomical geodesy (geometrical procedures)
- physical geodesy and gravimetry (gravity measurement)
- satellite geodesy and land surveying.
The spheres of activity mentioned concern also parts of geophysics and Geodynamik, as well as navigation, Potenzialtheorie and Differentialgeometrie.
See also
- astrogeodesy, astrometry, earth measurement, higher mathematics, Ozeanografie, Satellite Ranging, trigonometry
- earth ellipsoid, Geoid, GRS 80, Gauss Krüger, Potenzial, Schwereanomalie, VLBI
- reference system, fundamental system, earth rotation service, ITRS, World Geodetic system.
