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Journey through time - Topographic maps (Federal Office of Topography swisstopo)
Since its foundation in 1838 by Guillaume-Henri Dufour, swisstopo has produced three official national map series, the topographical map of Switzerland 1:100’000 (Dufour Map), the topographical atlas 1:25’000 / 1:50’000 (Siegfried Map) and the Swiss National Maps in different scales. The collection of these products constitutes a cultural asset of national significance which qualifies as a kind of «topographical landscape memory of Switzerland». The «journey through time» allows to interactively explore the evolution of the landscape.