Huang He

Under the rug (4) Huang He

The Yellow River, in northern China, has a quite active delta. These images have been obtained on , quite a treat if you like spatial imagery. You can compare images from 1999 on, and they are updated quite frequently, although they are low-res (30 m pixel). Google Earth has a higher definition in some areas, and is more agile in software terms, but this is a clearly precise time machine.

Usually satellites are configured to hoover over the same spot at fixed intervals (return intervals), at the same sun hour. But the same hour doesn’t mean the same tide position, so I’m not sure whether these images are taken at equal water levels; besides, chances are the satellite in 1999 was not still active in 2013. Anyway, there are substantial changes in that “receding rug”. Artificial ponds appear (salt flats?), on some areas the sea advances and in others it loses the battle (more often that)