On Sun, Dec 30, 2012 at 6:45 AM, Todd Grigsby <[email protected]> wrote:
> You can't use a barometer to accurately determine altitude.  Air pressure
> changes almost continuously for a variety of meteorological reasons.

Over a period of few minutes, you can. The XOOM was the first device
with a barometer IIRC, and I definitely recall presentations by (now
former) MOTODEV staff discussing tests they ran using parking garages,
and how the XOOM nailed the height change fairly well.

Over a period of hours or longer, though -- such as what the OP's
trying to do -- you are spot on. Weather will have a substantial
impact on barometric pressure.

--
Mark Murphy (a Commons Guy)
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http://commonsware.com/blog | http://twitter.com/commonsguy

In questi siti web puoi chiedere o rispondere a domande relative allo
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