(August 14, 2014 at 7:26 pm)CristW Wrote:The first step in quoting sources is to verify them.
From http://abcnews.go.com/blogs/technology/2...-new-data/
“The problem is very simple,” said David Sandwell, a Scripps geophysicist who worked on the project, in an email to ABC News. “When you measure seafloor depth you actually measure the two-way travel time of a sonar echo. The ship sends it, it bounces off the bottom, and returns to the ship. To convert the time to depth you need a velocity. If the velocity used in the conversion is a bit too high, the depth from that cruise will be greater than all the surrounding cruises. The particular cruise that created the ‘Atlantis’ problem was a systematic mow-the-lawn type survey in a regular grid pattern, so the resulting depth errors looked like a regular grid.”