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>As a sidenote, Australia moves about 7cm north annually [1], so any encoding of GPS location is not flexible enough in the long term.

In a hundred years, this will be off by 7 meters. I highly doubt that makes a huge difference in addressing a physical building.

>Also only encoding lat/long makes it so you would not be able to address a single floor in a large building.

As is the case with regular physical addresses.

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