In 1912 the geodetic height reference point of the German main height network was relocated from the former Berlin observatory (normal height point 1879) to Hoppegarten (normal height point 1912) after the decision to demolish the Berlin observatory was decided in 1908. The normal height point consists of a total of eleven underground fixtures made of Silesian granite with embedded measuring points that are each several kilometers apart and thus form a so-called point group. The German main height network from 1912 (DHHN12) referred to sea level. The 1912 normal high point is still of importance today as a geodetic reference point.
December 30, 2020