Google and Samsung collaborate in released last week by the new Galaxy Nexus, this phone carrying a lot of "new stuff", for example Barometer (Barometer). In the subsequent media comments and developers discussion, all think that mobile phones with built-in barometer is in order to predict the weather, help developers to make more accurate weather class App.
But Google engineer Dan Morrill in Google + described the role of barometer:
In fact Galaxy Nexus barometer and not outside had conjectured so mysterious. It is the most key role, is to let the GPS positioning faster and more accurate.
In theory, GPS is a four-dimensional system, it can get a 3d space coordinates and a time to coordinate. That's right, most wireless base station is through the GPS to gain time (in synchronous communication system is of vital importance to the). But a big weakness is GPS: precise positioning your geographic coordinates, the need for a couple of minutes.
This is why you of cellular phone specification table to write "AGPS" (assisted GPS) sake-mobile phone use base station information can be quickly locate, but not high accuracy, and is limited to the plane. I put the location called "2D GPS".
