We have had detailed infrared satellite survey of the zones behind the iron curtain, i.e. there should be mapping records of before and after 1989. (realclimate.org)
Via:: The World Bank News & Broadcast: First Satellite Observations Of Gas Flaring Show Countries, Companies Need To Step Up Efforts (press release),:: Biopact: First global satellite survey of gas flaring shows hidden costs of oil (blog) (treehugger.com)
According to a painstaking satellite survey of 1.3 million lakes stretching from coast to coast, the country lost 6700 square kilometres — or 1.2 per cent — of its water surface area between 2000 and 2009. (newscientist.com)