![]() ![]() ![]() ![]() A new perspectiveįor this reason, Amelung and colleagues decided to use 33 snapshots obtained by the Canadian RADARSAT satellite from 2002 to 2005 to assess land subsidence in New Orleans. “It was not very clear whether the reference points were sinking as well,” says Falk Amelung at the University of Miami, Florida, US. Moreover, while many of the roadside benchmarks have been carefully selected, they too can move over time. And using roadside reference points has prevented people from getting an “off the beaten path” view of subsidence. For years, scientists have known that New Orleans and its surrounding region are sinking, thanks to on-the-ground measurements using manmade reference points, many of which rest along highways.īut scientists typically conduct such surveys every decade or so, says Paul Kemp at Louisiana State University in Baton Rouge, US, who has researched coastal erosion. ![]()
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