Can be located which floor we are via smart phone GPS?

Question

Is there a way that can decide which floor we are via smart phone?

For example, i m in a building. floor 5;

the native app in my smart phone can know i m on floor 5 and give me some advice about floor 5（navigation to floor 1）

Answer 1

With some newer Android phones (e.g., Samsung Galaxy S3), embedded barometric pressure sensors can be used to derive an accurate indoor altitude estimate, which could be transformed into floors (assuming you know which elevation the floor is located at).

See this article on STMicroeletronics pressure sensor:

http://www.engadget.com/2012/09/06/stmicroelectronics-details-pressure-sensor-in-your-galaxy-s-iii/

This app shows altitude based on barometric pressure:

https://play.google.com/store/apps/details?id=com.snakebite.mike.altimeter

Here's the Android API: http://developer.android.com/reference/android/hardware/SensorManager.html#getAltitude(float,%20float)