ED50
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ED50 is a geodetic datum which was defined after World War II for the international connection of geodetic networks.
Gerlach Hemmerich
Geodesy
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Geodesy or geodetics is the science of measuring and representing the geometry, gravity, and spatial orientation of the Earth in temporally varying 3D space. It is called planetary geodesy when studyi
ED50
…the personnel of the Reichsamt für Landesaufnahme, the State Surveying Service, in Friedrichroda, Thuringia. This group had been working under renowned geodesist Professor Erwin Gigas to integrate the mapping of the occupied territories with that of Germany. They were directed to continue this work in US-occupied…
Geoid, an approximation for the shape of the Earth; shown here with vertical exaggeration (10000 vertical scaling factor).
Height measurement using satellite altimetry
GPS Block IIA satellite orbits over the Earth.
Geodetic control mark