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2/10/2014 10:55 AM EST
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Re: Bosch MEMS sensor - air pressure and SI units
DrQuine   2/13/2014 4:58:32 PM
Thanks for the "QNH" aviation explanation.  Certainly the same approach could work for SmartPhones: the GPS would provide a location and the nearest reference barometer could provide the correction factor.  The one remaining issue would be the pressure differential inside the building.  Many buildings run at positive pressure which would cause the "altimeter" to read a lower floor level than it should (denser air). Perhaps a simpler approach would be for the GPS to detect entry into the building perimeter, use the indoor ground level air pressure as the barometric pressure reference. It could then compute floor levels by the associated pressure reductions as the air pressure reduced with increasing altitude.

David Ashton
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Re: Bosch MEMS sensor - air pressure and SI units
David Ashton   2/13/2014 5:15:10 PM
@DrQuine....I didn't know about buildings being pressurised.  As you say there are ways round this but the easiest thing is probably to find an elevator and see what floor you are on :-)

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