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A comment on Raising of Chicago. Parent comment

Re:Raising of Chicago by moron4hire on Friday October 26, 2018 @02:40PM (#18311765)
That's literally true. The GPS system sacrifices precision in Altitude for precision in Latitude/Longitude.
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Re:Raising of Chicago by justinator on Friday October 26, 2018 @08:56PM (#18313755)
How? I was just under the impression that figuring out a correct elevation via gps is a hard problem. Airplanes use barometric pressure for altitude.
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Re:Raising of Chicago by wbl on Saturday October 27, 2018 @01:18AM (#18314464)
It isn't hard, it's just that with a bit of road in between you and the sky the signal is lost. Airplane use barometric pressure for altitude is in part backwards compatibility. https://en.wikipedia.org/wiki/Flight_level
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