As ESA and China mark a decade of cooperation, imagery over China's Poyang lake is testament to the new Sentinel satellite's promise of continued radar data acquisition for a multitude of applications.

The Poyang lake in southern China's Jiangxi province is the largest freshwater lake in the country.

This lake is an important habitat for migrating Siberian cranes - many of which spend the winter there. The basin is also one of China's most important rice-producing regions, although local inhabitants must contend with massive seasonal changes in water level.

In addition to seasonal changes, a team of scientists working under ESA's Dragon programme have identified an overall decrease in water level in the lake over the last decade.