Map: much interesting geowankery going on in London, where they suffer under the same Ordnance Survey monopoly as we do in Ireland.
Given ‘enough processing’, data extracted from that map becomes a Derived Work, and have no copyright restrictions. ‘Processing’ includes ‘vector extraction, classification, etc.’
Now, I worked it out — central Dublin city centre covers about 3km x 4km. At the named rates for London, that works out at an inexpensive $210! Looks like it was imaged in September 2003.
There’s something interesting for a local geohacker to add to their list of projects ;)
(There’s also some old Landsat-7 data that may be usable.)