[OSM-talk] GPS Altitude vs Pressure Altitude article, Tool for measuring elevation above sea level

[Martin Koppenhoefer]

sent from a phone

> On 28. Nov 2017, at 06:10, Oleksiy Muzalyev <oleksiy.muzalyev at bluewin.ch> wrote:
> 
> Besides the number of the satellites increased lately, and the quality of the GPS receivers is also improving. And everyone who has got a modern smartphone has got a GPS altimeter.


Some smartphones and some consumer gps units also feature barometric altimeters. Our consumer GPS units, especially those in smartphones with their suboptimal antennas, are unsuitable for measuring elevation precisely, the accuracy in the z-direction, from what emerged from previous discussions about this, is about 10 times inferior with respect to x/y.


cheers,
Martin