00:00Save-vous why the oceans are so bad at the point that we know better the surface of Mars than
00:05that of the ocean?
00:06This chart shows the parts of the ocean really cartographed parts of the ocean.
00:10In zoom on, we see the bands across the ocean.
00:13They represent the sections measured with the technology SONAR,
00:16while the rest is cartographed with a very low resolution resolution.
00:19To give you an idea, the modern satellites have been cartographed Mars with a resolution of 6 m per pixel,
00:25while the oceanic parts are only 5 km per pixel.
00:28But why is it so difficult to cartograph the ocean?
00:32Mainly because of the water and its depth.
00:34The satellites can't cartograph directly directly the ocean,
00:38because the radar radar can only traverse the surface of the ocean without penetrating the depth.
00:42That's why we depend on the SONAR to explore the ocean.
00:45However, the SONAR has also its limits.
00:47It is cost-effective, takes time and can only cover small sections at the same time.
00:52The precise cartography of the ocean is a major challenge,
00:55illustrando la complexité de sonder les profondeurs cachées sous les océans de notre planète.
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