London

London

 

A major benefit of satellite data is that images taken on different dates may be easily compared. Here a multitemporal image shows changes to the land around London. Three images were made in December 2002 (shown in red), May 2003 (green) and August 2003 (blue). Areas with no change, such as London in the left half of the frame, appear grey. Colours in the Thames estuary at right come from different surface conditions in the water at the time of imaging. The large colour fringes seen at upper right show tidal surges. Following the river through London, many of the city’s bridges can be seen. At far left are the dark lines of Heathrow Airport’s runways. Elsewhere colours indicate changes to ground cover - the growth of crops for example. This image was made from data gathered by the ASAR instrument on the European ENVISAT satellite.

Image © European Space Agency

 

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