A map-based website where you can compare the current map of Helsinki with the old aerial photographs. Also, you can compare old maps from 1837 and 1897 to the aerial photograph from 1943. Used datasets Orthophotographs of Helsinki This dataset provides the orthophotographs of Helsinki in GIS API from 1932 to present day. Additionally, photos from 1988, 1976, 1969, 1964, 1950, 1943 and 1932 are provided as... WMS WMTS TIFF Please enable JavaScript to view the comments powered by Disqus. comments powered by Disqus