Animated height map (IMAGE) University of Oxford. Caption. An animation showing the calculated eruption altitude using data from three weather satellites. Credit ...

The map was first published in 2010 by Michael Lefsky of Colorado State University and updated last year by Marc Simard of NASA’s Jet Propulsion Laboratory. It is based on […] Forest height in ...

Lefsky based the map on data from more than 250 million laser pulses collected during a seven-year period. Because each pulse returns information about a tiny portion of the surface, lidar offered ...