Using radar interferometry, you can get very high-resolution altitude and surface shift detection. I knew the researcher who was doing the synthetic aperture ra

Using radar interferometry, you can get very high-resolution altitude and surface shift detection. I knew the researcher who was doing the synthetic aperture radar back in the 80s starting with SeaSat data, and he was getting very detailed elevation maps and earthquake change maps. He was also measuring glacial flow. Funny that the author of the piece doesn't mention the principal researcher on that project at JPL (and she happens to the same last name as one of the other JPL researchers). Anyway, I can only imagine that this technology's gotten a whole lot cheaper now.