My wording was off. It is not trivial to measure or generate each frequency of light! So, new technologies that could enable satellite-based mapping of the sea

My wording was off. It is not trivial to measure or generate each frequency of light! So, new technologies that could enable satellite-based mapping of the sea floor would likely rely on the development of frequency specific sensors. And, as was pointed out, perhaps new ways of measuring and generating specific frequencies of audio.