More of North America’s land is covered by rivers than we thought, according to a new map. Scientists came up with a way to use satellite images to estimate the width of rivers and found that previous methods tended to underestimate how wide they are. The discovery could have implications for studies of flood risk.
A team led by hydrologists Tamlin Pavelsky and George Allen of the University of North Carolina developed an algorithm that brightens water on satellite images and makes everything else appear dark. They then used the algorithm to analyze 1,756 Landsat images of North America.
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