Tianjin China
1055 of 1114

Tianjin, China

January 16, 2006
This Envisat multi-temporal image shows the municipality named after Tianjin, China's third largest city.

This largely flat territory has played an important part in Chinese history, as the gateway between Beijing, to the northwest, and the sea. Today its capital is a prosperous city of ten million inhabitants, surrounded by fertile farmland.

The urban center itself is the grayish area at the center of the image. Winding through it towards the coast and also the settlement of Dagu is the Hai He River. The curve of Bo Hai Bay on the Yellow Sea is visible on the bottom right side of the image.

Tianjin's name means 'Heavenly Ford', and today the municipality is an important railway and road junction as well as hosting China's largest container wharf and Tianjin Binhai International Airport.

The Airport runway shows up as a straight dark streak on the radar image, located in Dongli District, due east of the urban center. The large Beidagang Reservoir is conspicuous to the southeast of the city center, in Dagang District towards bottom right of the image, with the Liujian River flowing beside it.

Radar images measure surface roughness rather than reflected light. The color in the image comes from the fact that this is actually a combination of three Envisat Advanced Synthetic Aperture Radar (ASAR) Image Mode Precision images, and is used to highlight changes occurring between acquisitions.

A color is assigned to each date of acquisition: red for 9 April 2004, green for 27 August 2004 and blue for 30 January 2004.

(Image of the week published the 21 January 2005)

Technical Information:
  • Satellite: Envisat
  • Instrument: ASAR
  • Acquisition: 27-Aug-2004
  • Orbit nr: 13026
  • Center coordinates: lat. 38.83, lon. 116.94

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