On 17 May 2011, images from the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR) TerraSAR-X radar satellite gave urban planners an accurate view of how much the city of Istanbul has spread out recently.
With an area of more than 1800 square kilometres, the Turkish city is occupying more and more space and is expanding into the hinterland with new neighbourhoods. TerraSAR-X is helping to identify urban sprawl from space. “Urban sprawl” is the name given to what happens around metropolises like Istanbul. The buildings in a city reflect the radar signals back to the receiving antenna significantly differently to undeveloped areas.
More information can be found at: DLR