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TheTopographic Atlas of Switzerland (German:Topographischer Atlas der Schweiz), also known as theSiegfried Atlas orSiegfried Map (German:Siegfriedkarte;French:Carte Siegfried), is an officialmap series ofSwitzerland. Its publication was begun by theFederal Topographic Bureau underHermann Siegfried [de], and continued from 1870 to 1926.[1] During this period the individual maps were drawn by different lithographers, includingWalter Hauenstein,Georg Christian von Hoven andRudolf Leuzinger. Since it is, in today's parlance, not strictly anatlas but a map series,map historians now describe it only by the expressionSiegfried Map.
The Siegfried Map was based on the original records that had already been created for the earlierDufour Map. However, the Siegfried Map offered greater precision than the Dufour Map, by using a scale of 1:25,000 for theSwiss Plateau, theFrench Prealps, theJura Mountains and southernTicino, and a scale of 1:50,000 for other mountain regions and theSwiss Alps.
The area covered by the former scale was initially divided into 462 pages, and the other area into 142 pages, with the two areas overlapping in places. A format of 35 centimetres (14 in) x 24 centimetres (9.4 in) for each page was common to both scales.
Another significant departure from the Dufour Map was the presence ofcontours to symbolize the relief (a granularity of 10 metres (33 ft) for the 1:25 000 pages, and 30 metres (98 ft) for the 1:50 000 pages). In addition, three colors were used directly for printing, whereas the Dufour Map was initially monochrome. On the Siegfried Map, the colours used were brown for the contour lines on vegetated terrain, blue for water and contour lines on glaciers, and black for the rest.
The Siegfried Map projection was a cone equivalent, as for the Dufour Map.
The print mode used for the 1:25,000 pages was initiallyintaglio, and from 1905 a printing plate. The 1:50,000 pages were printed via alithography process, and from 1910 by intaglio.
Until 1949, there were occasional revised editions of Siegfried Map pages. From 1952, the Siegfried and Dufour Maps were replaced by the newNational Map of Switzerland.
