So… Who is going to publish the first altimeter vs iphone barometer comparison?
Given we have GPS alt, what benefit to apps does press alt now provide?
Possibles…
1) second by second system & frontal positions and precise shapes
2) better validation of forecast weather algorithms
3) 3d pressure modelling
4) gps signal validation improvements / noise corrections
5) world open weather data via apps to improve dataset and pattern recognition
DMEarc
Pressure altitude is used by ATS, airspace limits…
I can imagine it can easily replace garmin 296 and similar
Local sea level definition can differ from the WGS84 ellipsoid up to 200ft. So the pressure altitude is based on that.
The belief GPS is always better is wrong in this case.
I think people are underestimating the significance of potentially 100 million barometers that are connected with a gps sensor on board. Weather data just changed the most since satellite technology.
No, I would not do an approach to minimums by GPS altimeter of an iPhone :-) But the GPS is precise enough for many other tasks, like calculating top of descent or altitude warnings,
Flyer59, I’m referring more to weather mapping than navigation. But yes, in nav, it has some value but not certain yet.
I would not do an approach to minimums by GPS altimeter of an iPhone
The sensor has an accuracy of +/-1hPa or 8m, more accurate than an conventional altimeter.
Regarding weather mapping, I agree.
http://cliffmass.blogspot.com/2014/09/the-iphone-6-has-barometer.html
One problem is that you can get an error of 100-200ft or so between the cockpit and the outside.
The sensor has an accuracy of +/-1hPa or 8m, more accurate than an conventional altimeter.
How large is the drift over time? I assume that these things are never calibrated…
