Wetlands 1850 - 2010 (shapefiles)

History of wetlands - GIS-Layers Location of wetlands based on signatures in topographic maps Basis 1850: original measuring table sheets Dufour created between the years 1834 and 1863. Basis 1900/ Basis 1950: The Siegfried maps were updated and published at regular intervals between 1870 and 1949. This long period of time made it possible to reconstruct wetlands for two periods based on the Siegfried Maps: the first edition (hereinafter referred to as "1900") and the last edition ("1950"). * Basis 2010: Map sheets from the National Map from 2006 to 2011 were used for the most recent time period of the reconstruction. Location of wetlands due to reconstructions The reconstruction must not be interpreted in the sense of a surface-accurate separation, but shows without claim to location accuracy the approximate extent of the areas that would have corresponded to the mapping criteria for wetlands used in today's topographic maps around 1850, 1900 and 1950. The basics can be found in Stuber & Bürgi 2019, chapter 5.4.