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Because we have to use sound waves instead of radio waves. But the article is mostly about satellite based gravimetric mapping techniques which are fundamentall

by jpm_sd 3y ago

Because we have to use sound waves instead of radio waves. But the article is mostly about satellite based gravimetric mapping techniques which are fundamentally low resolution.

emmelaich 3y ago
You can use laser, but that's only good for up to around 50m deep. https://www.dst.defence.gov.au/innovation/laser-airborne-depth-sounder-lads https://www.dst.defence.gov.au/innovation/laser-airborne-dep...
- dylan604 3y ago
  that's not very useful for the task then is it? maybe along shorelines, but that's not what needs mapping since it's already been covered in details.
  - Groxx 3y ago
    Yeah, that kinda sounds like the equivalent of "this tool maps land perfectly unless there's a tree or snow within sight". Not useless, but far from a solution.
  - emmelaich 3y ago
    Right, not so much for purposes mentioned in the article, but still valuable for reefs and navigation.
- sandworm101 3y ago
  50m of clear blue Caribbean paradise water. Or 5cm of turbid Amazon river outflow.
dieselgate 3y ago
No comment on the mapping specifics for this but I always found it fascinating and cool how sound waves move almost 5x faster through water than air.