How to look at the altitude with a mobile phone?

How to measure altitude with a mobile phone?

Nowadays, mobile phones are more and more powerful. They can not only make phone calls, send text messages and surf the Internet, but also measure the altitude. So, how does the mobile phone measure the height?

Use GPS to measure height

GPS is called GlobalPositioningSystem, which is a technology that uses satellite signals to determine the position of any point on the earth. When measuring the altitude, the mobile phone will locate its position through GPS, and then compare it with the altitude marked on the map to calculate the altitude of the current position.

The advantage of using GPS to measure altitude is high accuracy, but the GPS function of mobile phone needs to be turned on, which is better in open areas.

Measure the altitude with a barometer.

In addition to GPS, mobile phones can also use the built-in barometer sensor to measure altitude. The barometer sensor can calculate the height by measuring the change of atmospheric pressure. When the air pressure becomes lower, the height will increase, and vice versa.

The advantage of measuring altitude with barometer is that it does not need network connection and can be used anywhere. However, due to weather, terrain and other factors, the accuracy is low.

Mobile phones can measure altitude through GPS and barometer sensors. The accuracy of GPS measurement is high, but the GPS function needs to be turned on to be used in open areas; Using barometer does not need network connection, but its accuracy is low. In practical application, we can choose the appropriate height measurement method according to the specific situation.