The iPhone and iPad Find My app has a 3D viewing option that seems to
show the vertical position of the shared person in a tall building.

Is that height accurate?

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On 2024-07-19, Colour Sergeant Bourne <bourne@rorke.za> wrote:

The iPhone and iPad Find My app has a 3D viewing option that seems to
show the vertical position of the shared person in a tall building.

Is that height accurate?

There's no black & white answer to this. Accuracy will naturally vary
based on the environment and technologies in use. If you want a
real-world answer in your own environment, go ahead and try it out for yourself.

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On 2024-07-19 15:36, Colour Sergeant Bourne wrote:

The iPhone and iPad Find My app has a 3D viewing option that seems to
show the vertical position of the shared person in a tall building.

Cool.

Is that height accurate?

Would depend on how the target iPhone is computing its position and
elevation.

GPS: then within 10-20 metres. GPS reception in a tall building would
depend on the building cladding (some glass has metal film on it).
Multipath of the signal between floor and ceiling would increase the error.

Trilateration: (cell towers): no opinion - this would depend on
knowledge of the elevation of the cell tower antennas being available to
the target iPhone's positioning estimator. With such - possibly better
than 10 - 20 m - but I'm skeptical.

AirTag: not likely.

Barometer: possible - as long as it recorded a a recent reference using
GPS while it was in a good GPS signal area. 10 - 20m.

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