New elevation data triples the people at risk.
It may be hard to believe our elevation data could be so far off, but consider how we get it.
calculates the elevation of upper surfaces, not the actual earth itself, which means it’s especially inaccurate anywhere that’s either densely vegetated or populated, since there are physical objects protruding from the ground in both cases.enables us to see the actual elevations, but that data simply didn’t exist for most of the world.
CoastalDEM is essentially a neural network that’s trained by looking at the differences in the LIDAR elevations versus the SRTM elevations in the U.S. Across the country, SRTM is off by an average of 3.7 meters , but peaks nearly a meter higher in coastal cities. By analyzing the patterns in these discrepancies, the CoastalDEM model can reduce the error in elevation data down to less than 0.1 meters .
These new estimates don’t affect everyone equally, though. As the map above shows, the vast majority of affected people will be in Asia. The authors calculate that more than 70 percent of people living on threatened land are in just eight countries: China, Bangladesh, India, Vietnam, Indonesia, Thailand, the Philippines, and Japan.in risk based on this new research isn’t spread evenly around the world, either.
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