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Nasa's surface water and ocean topography satellite — or swot — should improve weather forecasting, help to manage freshwater supplies in regions suffering drought, and give us new insights on the consequences of climate change. 0ur science correspondent jonathan amos joins us from chicago. so so just talk us through the significance of the satellite? fist significance of the satellite? at the significance of the satellite? git the experimental mission but it's a big advance on what has gone before. we've really struggled to see some of the rivers around the world, some of the rivers arou...

Vehicle radar. >> i always love you guys with the names. this is fairly new technology, only been in use i believe you said over the past year-and-a-half. so how does this help? had i know you used it with other disasters, but let's talk specifically oil right now. how can this help us understand what this oil is doing? >> well, this is a radar instrument, and so you're looking at scattered radiation from the surface. and oil on water actually comes back as a very dark scat terror. so you can try to track the extent of the oil as it moves on the water. and then once it hits the coastline, the ...