[OHM] Historical Helsinki map published

[Chris Helenius]

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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