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This multi-temporal image, created by merging three separate images acquired by the Envisat and ERS-2 satellites, shows the Three Gorges Dam. It is a hydroelectric dam built along the Yangtze River near the town of Sandouping, located in the Yiling District of Yichang, in Hubei province, China.

Completed in 2006, it is the world's largest power station in terms of capacity to generate electricity. The merging of the three satellite acquisitions (red 09 March 2010, green 19 April 2005 and blue 30 July 1996), shows the differences occurring along the banks of the river during the years.

Full multi-temporal view of area
View large image [JPG 693 KB]
Magnified view of area
View large image [JPG 289 KB]
Technical Information
Satellite: ERS and Envisat
Instrument: Synthetic Aperture Radar (SAR) and (ASAR)
Date of acquisition 09 Mar 2010, 19 Apr 2005, 30 Jul 1996
Orbit number: 41941, 16390, 06671
Band combination: Multi-temporal image (RGB)
Images used to create the multi-temporal merge
View large image [JPG 354 KB]
Technical Information
Satellite: Envisat
Instrument: Advanced Synthetic Aperture Radar (ASAR)
Product: ASA_IMP_1P
Date of acquisition: 09 Mar 2010
Orbit number: 41941
View large image [JPG 352 KB]
Technical Information
Satellite: Envisat
Instrument: Advanced Synthetic Aperture Radar (ASAR)
Date of acquisition: 19 Apr 2005
Date of acquisition: 16390
View large image [JPG 373 KB]
Technical Information
Satellite: ERS-2
Instrument: Synthetic Aperture Radar (SAR)
Product: SAR_IMP_1P
Date of acquisition: 30 Jul 1996
Orbit number: 06671
Map of area

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20 Years of SAR