Earlier today I twitted a link about an English Heritage study of aerial photographs of the landscape around Hadrian's wall to pick out eveidence of the landscape history, including celtic settlements and post roman early medieval settlements.
And then I remembered a report from earlier this year of archaeologists using Google Earth to search for the remains of sites of archaeological interest in Afghanistan.
And then I had a thought. Is google earth good enough to search for the remains of missing Roman period remains, not to mention celtic hillforts and the like. If so one could imagine people doing detailed scans of individual 1km blocks to look for likely sites.
After all they tried the same thing looking for Steve Fosset. It might just be work as a strategy.
perhaps I should try it ...