nasa t1_ivkw9dq wrote
Reply to comment by qwopax in AskScience AMA Series: We're NASA experts working on SWOT - an upcoming mission that will observe nearly all water on Earth's surface. Ask us anything! by AskScienceModerator
SWOT will measure 90% of the surface water on Earth. It won't measure the water that is at a higher latitude than 78 degrees North or 78 degrees South.
It also won't be able to measure very small lakes (smaller than 15 acres) or small rivers (narrower than 330 feet, or 100 meters). (BH)
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