Ac explorer error updating map

At the end of this month, we will be running an update of our free Massive Open Online Course (“MOOC”) about “Exploring Our Oceans”, intended for anyone interested in finding out more about our watery world, with no previous background in science required.

One topic we’ll look at in Week 1 of the course, “A hidden landscape”, is how we map the ocean floor, and how much has been mapped at different levels of detail.

Philosophically, when it comes to exploring anywhere on our dynamic world, how and when do we decide that somewhere has “been explored”?

Do we declare “mission accomplished” once we’ve seen a location for the first time?

That’s the resolution of the new global seafloor map, which uses some nifty tricks with satellites to estimate the landscape of the seafloor, and even reveals some features of the Earth’s crust lurking beneath seafloor sediments.

And the previous global map of the ocean floor, created using the same techniques and published in 1997, had a resolution of ~20 km.

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Where there is a large underwater mountain or ridge, for example, the tiny local increase in gravity resulting from its mass pulls seawater into a slight bump above it.The local woods where I walk my dog look very different in winter compared with summer, with different species flourishing at different times.Should I have considered them “explored” after my first visit in just one season?However, if we want to detect things just a few metres in size on the ocean floor, such as the mineral spires of deep-sea vents or the wreckage of missing aircraft, we need to take our sonar systems much closer to the seabed using underwater vehicles or towed instruments.At present, less than ~0.05 percent of the ocean floor has been mapped to that highest level of detail by sonar, which is an area roughly equivalent in size to Tasmania.

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