The National Archives of Finland just published a map, from 1823, with the old winding streets of Helsinki, overlayed on the then-planned and now current street grid. http://digi.narc.fi/digi/slistaus.ka?ay=222866
Here is my rectification which can be used in JOSM: http://mapwarper.net/maps/3371#Preview_Map_tab It most likely displays the largest extent of the historical Helsinki at its current position, before the straightening of the roads. It doesn't display all of the buildings, mostly plots on the centre area and some outlying buildings at the wharf in south. Mapping the historical city has been a desire of mine for several years, but is it OK to just map currently nonexistent features on an already very crowded district? Wouldn't that make the map view, when editing and downloading data, even more messy? It also raises the question of correct tags. Should they be was:landuse=residential; end_date:1823? /Chris Helenius
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