Hellenic Geodetic Reference System 1987, Geodetic reference system in Athens, Greece
The Hellenic Geodetic Reference System 1987 is a coordinate framework based on the Dionysos geodetic station located northwest of Athens. It applies the GRS80 ellipsoid with a transverse Mercator projection to express positions in meters.
Established in 1990, this system built on parameters defined in 1987 with precision margins of 0.1 parts per million. This foundation allowed Greece to create a unified national surveying framework.
Greek surveyors and cartographers adopted this system to create precise national maps and conduct land measurements across the entire Greek territory.
This system enables precise land surveying and mapping across all of Greek territory. Users should note that this framework was developed specifically for Greece and therefore does not directly align with other international coordinate systems.
The system was designed to account for tectonic plate movements across Greece, which affects how measurements taken at different times remain compatible. This adaptation makes it particularly relevant for a country situated on seismically active ground.
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