Johann Georg Lehmann (geodesist)
Johann Georg Lehmann (born May 11, 1765 in Baruth / Mark ; † September 6, 1811 in Dresden ) was a German geodesist and cartographer who developed the Lehmann hatches named after him .
life and work
Lehmann was the son of a miller . From 1789 he attended classes at the cadet institute in Dresden. During his mapping work, he developed the Lehmann hatches that were later named after him : the steeper the terrain, the darker the hatches are. This invention, which he published in 1799, became the dominant method of depicting relief in the topographic maps of the 19th century - both in Germany and in other European countries. Lehmann's goal was to reproduce the relief with just one method. Nevertheless, the cards should be legible and suitable for military use.
Publications
- Presentation of a new theory for the designation of the inclined surfaces in the ground plan or the situation drawing of the mountains. Fleischer, Leipzig 1799.
literature
- Rudi Ogrissek: The Saxon military cartographer Johann Georg Lehmann (1765–1811), creator of a scientifically based system of relief display using hatching, in: Vermessungstechnik: geodetic-cartographic journal of the German Democratic Republic for Science and Practice, 35th year (1987), Book 5, pp. 154-157.
- Walther Fischer: Lehmann, Johann Georg. In: New German Biography (NDB). Volume 14, Duncker & Humblot, Berlin 1985, ISBN 3-428-00195-8 , p. 83 ( digitized version ).
- Siegmund Günther : Lehmann, Johann Georg . In: Allgemeine Deutsche Biographie (ADB). Volume 18, Duncker & Humblot, Leipzig 1883, p. 141 f.
Web links
- Literature by and about Johann Georg Lehmann in the catalog of the German National Library
- Lehmann, Johann Georg at WorldCat
Individual evidence
- ↑ Walther Fischer: Lehmann, Johann Georg. In: New German Biography (NDB). Volume 14, Duncker & Humblot, Berlin 1985, ISBN 3-428-00195-8 , p. 83 ( digitized version ).
- ↑ Jana Moser: Relief representation yesterday and today - Johann Georg Lehmann on the 200th anniversary of death . Memorial colloquium on October 14, 2011 at the TU Dresden. In: Cartographic News . 62nd volume, No. 1/2012, p. 36 f.
| personal data | |
|---|---|
| SURNAME | Lehmann, Johann Georg |
| BRIEF DESCRIPTION | German geodesist and cartographer |
| DATE OF BIRTH | May 11, 1765 |
| PLACE OF BIRTH | Baruth / Mark |
| DATE OF DEATH | September 6, 1811 |
| Place of death | Dresden |