[math-fun] meticulous mapmaking
https://www.youtube.com/watch?v=P8qFi74k2UE is a remarkable 26min recording, from the nadir of drawback, of the 3 Mar 11 tsunami racing up the Okawa River from Kesennuma. At 4:50 two young men step jauntily off the steel footbridge which is washed away at 8:13. (Regrettably off camera, but you can hear the bolts pop.) The comment of 23 May titled 5:01 gives the street view of that exact spot a couple of years later. Many trees and buildings, including the big school that saved dozens, have vanished. (It looks like they're starting a new bridge.) Panning 180ยบ shows the stub of the bridge off which the young men stepped. Now switch to map mode and zoom in 2 clicks to see the little notch in the street from the bridge stub! (Maybe the cartographer merely incompletely erased the bridge from the old map.) There are also outlines of new buildings on the school site, absent from the streetview. Now switch to satellite and see that the school has been replaced by those buildings and a parking lot, and the stub is still there! (And they didn't add a bridge, after all.) --rwg
participants (1)
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Bill Gosper