5/1/2023 0 Comments Cartographica helvetica![]() Thanks to the accuracy of the topographic surveys and their cartographic representation, it is possible to analyse and reconstruct the cultural and natural landscapes of former days.Īfter a few decades, the drained area had subsided so much as to require a second correction, carried out during the years 1962 to 1973. This decision allowed the entire area to be drained, however, numerous and extensive construction projects were required for harbors, bridges and roads. The most conspicuous result was that the water levels of the three Jura lakes were dropped to a common level. But first, however, it was necessary to slice through a hill for a length of 900 m and a depth of up to 34 m. This was achieved with the construction of the 8-km-long Hagneck Canal. The core of this project was to direct the Aare from Aarberg into the Lake of Biel. The work on the actual Jura water correction began in 1868 and was completed in 1891. During nearly 190 years, various projects were devised by different well-known engineers before Richard La Nicca finally proposed the only successful project in 1842. ![]() Two particularly devastating floods in 18 lead to the founding of a committee, headed by the local physician Johann Rudolf Schneider. ![]() Therefore, various measures were planned as early as 1652. Besides the obvious damages to crops, roads and settlements, the entire lake country was becoming transformed into marshland, a breeding ground for disease-transmitting insects, especially for malaria. During periods of high water the area was frequently flooded, and the backwater in the Zihl caused the Lakes of Biel, Neuchâtel and Murten to overflow. In Meienried the Aare was joined by the Zihl flowing from the Lake of Biel and headed towards Solothurn. ( Cartographica Helvetica Sonderheft 1).Daniel Vischer and Hans-Uli Feldmann: The first correction of the Jura waters, 1868–1891įollowing a different course than today, the Aare used to meander from Aarberg in a northeasterly direction towards Meienried near Büren an der Aare without ever touching the Lake of Biel. Also published as: Die Michaelis-Karte des Kantons Aargau 1:50 000 1837–1849.This carefully published brochure, edited by Marino Maggeti and Hans-Ula Feldman, recalls the importance of Aleksander Stryjeski’s work for the topography of Switzerland and his merit as a cartographer. It is interesting to note that the plates were copied by Schöninger in Munich using the method of galvanization invented shortly before (1837). 62 was entirely devoted to the figure of Aleksander Stryjeski. Michaelis supervised the engraving of the monocoloured, very fine-lined map on four copper plates by Delsol and Hacq in Paris, which lasted from 1845 to 1848. The engraving draughts at the 1:50,000 scale were established from 1842 to 1845. The cantonal government decided to publish a general map of the canton already a year before the topographic survey was even completed. It was unusual that Dufour did not insist on contour lines but allowed Michaelis to represent the topography with hachures. ![]() The fair drawing was done multi-colored on 18 sheets of different sizes at the 1:25,000 scale. Michaelis and his assistants sketched the terrain in 43 field books whose pages were lined with a unique rhomboid pattern. He started his work in 1837 with the 3rd order triangulation (geodetic survey) of the canton, followed by a detailed topographic survey. ![]() This situation did not change until Guillaume Henri Dufour needed exact geodetic and topographic surveys for his Topographic Map of Switzerland.Įrnst Heinrich Michaelis turned out to be just what the Aargau canton needed, even though he was not a surveying engineer but an army captain from Germany. Alfred Oberli: The 1:50,000 Michaelis map of Aargau canton, 1837–1849Īround 1800 the only complete maps of the Aargau canton were to be found firstly in the Atlas Suisse by Meyer and Weiss, and secondly on a sheet by Scheurmann. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |