Credit: CNES. Download this movie (MP4, 16.8 MB).
SWOT - The Lake Surveyor[15-Feb-19] The SWOT satellite is set to survey the height, area and changes in volume over time in lakes with a surface area of 6 hectares (15 acres) or more (i.e., an outline of 250 m by 250 m or 820 ft by 820 ft). Ultimately, the mission hopes to be able to observe water bodies of 100 m by 100 m (328 ft by 328 ft). More than 20 million lakes will be surveyed to deliver two types of product to users:
- A single-pass product will provide the area, surface height and change in water volume. Combined with bathymetry information (i.e., a lake's bottom topography), these data will enable the absolute amount of water stored to be deduced.
- A mean-cycle product will provide the mean surface height and area of a lake over a 21-day cycle. During this cycle, a lake can be observed once at the equator and up to 12 times at high latitudes. In some cases, part of a lake will be seen on one pass and gaps filled in on the next, combining the areas measured.