With winter weather fast approaching, we start to look at how the big chill will affects our economy. And for the Great Lakes, frozen ice is bound to affect shipping lanes and local fishing industries. Connected to the Atlantic Ocean by way of the Great Lakes Waterway, each year, millions of tons of cargo are moved onto the lakes, supplying the US and Canada with important commodities. In addition to economic impacts, the lakes have a significant effect on the regional environment and ecological systems so the importance of analyzing and observing these frozen waters is crucial for the region. Fortunately, two scientists from NASA and NOAA have developed a new space-based technique for monitoring the ice cover of the Great Lakes. "In the dark, it's difficult to read a map that's right in front of you," said Son Nghiem of NASA's Jet Propulsion Laboratory, Pasadena, California, one of the developers of the new technique. "Yet we now have a way to use satellite radars almost 500 miles [800 kilometers] out in space to see through clouds and darkness and map ice across the Great Lakes."