quote 00:16:57 Declassified satellite imagery (e.g., Corona, Argon and Lanyard) used in early mapping programs may be obtained from the USGS EROS Data Center at 605-594-6151 (e-mail at firstname.lastname@example.org) or from the National Archives at 301-837-1926 (e-mail at email@example.com).
How to get GEOINT Products at the NGA web site.
quote 01:00:05 Due to the satellite constellation in the UK, a large void exists from the zenith to the horizon in a northerly direction. This lack of GPS satellites results in poor satellite geometry in the north-south direction.
GPS measurements on the London Millennium Bridge, from a 2006 article in the Institute of Civil Engineers’ Proceedings on Bridge Engineering.
quote 20:16:11 As the mental maps of each of the islands grew, they started to merge together and the islands of London metaphor began to gradually fade away. Eventually, I switched to a small shirt-pocket sized map of inner London and left my islands of London map book at the hotel.
quote 17:46:32 Due to sensitivities over government and military installations, only 11 companies in China have licenses to do comprehensive mapping, and half of those simply exist to support the government.