> While realigning the coastline is possible, they will be surveying for a decade or so just to figure out everything that moved.
No, not a decade. While it will take some amount of time for changes to propagate to cartographic products according to their update cycle, the 'figuring out what moved' happens in essentially real time across the major geodetic network, and probably across a month depending on the ephemeris of the JAXA and ESA SARsat <http://vldb.gsi.go.jp/sokuchi/sar/index-e.html> platforms, although that is probably according to some sort of priority criteria derived from the GNSS data. See Geospatial Information Authority of Japan, "１．Continuous observation at the GNSS-based control stations" and "４．Synthetic Aperture Radar observation" at http://www.gsi.go.jp/ENGLISH/page_e30068.html Coastal survey is longer, because of temporal interval required to interpolate and detect sea level extremes between the phasing of the tides and the satellites, look angles, etc. Michael Patrick Geospatial Analyst <http://www.gsi.go.jp/ENGLISH/page_e30068.html>
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