Dikes and Lakes in the Netherlands – August 6th, 200952.6N 5.4E
This ASAR image gives a clear view of the Markermeer and IJsselmeer lakes, formerly the Zuiderzee inlet, in the Netherlands. These two lakes were created by the building of two dikes across the inlet: the Afsluitdijk and the Houtribdijk.
The former is visible as a thin, straight grey line across the dark waters in the upper right quadrant. The dike, which was constructed between 1927 and 1933, has a length of 32 km (20 miles) and a width of 90 m, at an initial height of 7.25 m above sea-level. It runs from Den Oever on Wieringen in North Holland province, to the village of Zurich in Friesland province.
The Houtribdijk also appears as a narrow line, connecting the cities of Lelystad and Enkhuizen. It is 30 kilometers long and was built between 1963 and 1975. The lake below is the Markermeer, and the other lake above, between the two dikes, is the IJsselmeer.
The color image, captured one day earlier, gives a comparative view of these lakes, showing a brighter green color in the Markermeer. This color difference may be due to a difference in algal concentration or in the suspended sediments – the Markermeer has greater wave action, which causes sediments to be churned up in the water.