Rauenberg (Berlin)

The TP Rauenberg (TP = Trigonometric point ) is the fundamental point of the German main triangle mesh ( DHDN ). He was on the previously as "Rough mountain " or " rough mountain " named hill in Berlin's Tempelhof- Schöneberg. Since 1985 there is a monument in the form of greatly enlarged head portion of a granite column, are indicated with the trigonometric ground points. The monument is located ten meters above the historic summit height of Rauen mountain. The Marie height ( 73 m above sea level) was filled in 1949-1951 with debris from the destruction of the Second World War and today is a public park.

History

The trigonometric point Rauenberg was the fundamental point of DHDN and delivered in 1832 from East Prussia incipient triangulation of the Prussian state recording with the astronomical azimuth direction to the eight kilometers from Berlin Marienkirche the storage of based on the rake surface of the Bessel ellipsoid network.

This 2D location system is called Rauenberg date, which was also the basis for the kingdom of triangular network (RDN, 1940) and since 1945 the German main triangle mesh. The earlier than Rauenberg or Rauhenberg named hill was destroyed in 1910 by the extraction of gravel, while also addressing the trigonometric point with its stone pillars and a 21 -meter-high wooden pedestal pillar pyramid disappeared without replacement. Therefore, it was explained after the Helmertturm on the Telegrafenberg in Potsdam to the " central point ". Although this TP has not been redefined, but his old - balanced in Rauenberg - date - coordinate maintained, has since been frequently spoken in date misrepresent the Potsdam. However, the date of the DHDN based on the original specifications at TP Rauenberg.

Function

As long as most of cadastral surveying points in Germany on the DHDN related ( Gauss-Krueger - coordinates), reflected the maps - and thus, for example, land boundaries - the historical significance of this fundamental point implicitly resist. Technically - geodesic, however, the point and today's brand as a replica of no importance, since nationwide decided the change of the German geodetic coordinate system to ETRS89 system and is also already taken place in most states.

Monument

The monument itself is created on the initiative of the Association of Surveying Authorities of the States, the Senate Department for Construction and Housing and the DVW National Association Berlin eV and consists of an oversized cube-shaped TP- stone granite, which protrudes from a tower-like structure. On the east and west side metal plate with a textual explanation of the monument or an image of the Prussian main triangle mesh embedded in the stone. The design for this monument is the result of an ideas competition, the Berlin DVW had awarded. The monument is located at the geometric location of the previous TP, about ten feet above the height of the historic summit Rauen mountain. There is no view to the still existing St Mary's Church near Alexanderplatz.

After the technical monument was smeared by graffiti and partially destroyed by metal theft in 2008, the DVW Berlin -Brandenburg has the Landesdenkmalamt the protected status as a monument, that is, the entry in the list of monuments, requested; this has not happened until now. The monument was restored with a cost sharing of the DVW -June 2010.

Memorial plates

The bronze plate on the facing to the east side of the monument bears a text In relief.

In the copper plate on the facing to the west side of the monument, a figure of the Prussian main triangle mesh is engraved with the level of 1900.