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January 18, 2006
This Advanced Synthetic Aperture Radar (ASAR) multitemporal color composite image shows the city of London. The image is composed of three ASAR IMP images acquired on different dates and assigning a color (RGB) to each date (Red: 13 December 2002 - Green: 02 May 2003 - Blue: 15 August 2003). The Thames River, the longest river in England, flows through London from west to east until it expands into a wide estuary and enters the North Sea. Numerous bridges connecting both parts of the city can be seen clearly. The colors of the sea and river reflect the differing wind conditions during the time of acquisition. The Thames River and its estuary are prone to tidal surges. This effect can be clearly seen in the low-lying areas and mudflats of Essex (in the top right part of the image), where some color fringes reflect the different tide and wind conditions on the day the three images were acquired. Visible landmarks are the Heathrow (west of London), Gatwick (south) and City Airport (in the urban eastern area, above the river) airports. The famous Hyde Park is also visible as a dark brown rectangular patch to the west urban area of London. The green, orange and red areas seen over the entire image correspond to agricultural fields with a high variation from one season to other.

Technical Information:
  • Satellite: Envisat
  • Instrument: ASAR
  • Acquisition: 15-Aug-2003
  • Orbit nr: 07620
  • Center coordinates: lat. 51.34, lon. 0.35

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