# Altitude from atmospheric pressure

## Calculates the altitude at the present location from the atmospheric pressure and temperature, and sea-level pressure. | ||

The atmospheric pressure observed is adjusted to the equivalent sea level pressure in order to construct the isobaric weather map. If the altitude is more than 11km high above sea level, the hypsometric formula cannot be applied because the temperature lapse rate varies considerably with altitude. |

- Purpose of use
- good calculator
- Comment/Request
- The altimeter of my aircraft does not take into account the temperature.

Why do you need temperature to compute elevation data ?

Thanks

[1] 2018/08/30 22:49 Male / 60 years old level or over / An engineer / Useful /

- Comment/Request
- How can one calculate the QNH for another elevation that is not more than 16 meters away from where the barometer is?

[2] 2018/07/18 03:23 Male / 20 years old level / An office worker / A public employee / Very /

- Purpose of use
- Python altitude from pressure and temperature calculator.

[3] 2018/05/31 15:00 Male / Under 20 years old / Elementary school/ Junior high-school student / Very /

- Purpose of use
- Checking equations for altimeter

[4] 2017/09/18 14:28 Male / 40 years old level / An engineer / Very /

- Purpose of use
- Crosscheck using hypsometric formula to compute altitude from pressure output of MEMS sensor for aeronautical instrumentation purposes.

[5] 2017/08/09 08:54 Male / 50 years old level / An engineer / Very /

- Purpose of use
- Hobby Airplane

[6] 2017/07/10 08:37 Male / Under 20 years old / An engineer / Very /

- Purpose of use
- Hobby
- Comment/Request
- If I wantt o use this in altitude calculations for a drone, every time I take it out I have to research the sea level temperature and pressure and adjust accordingly?

[7] 2017/05/24 08:12 Male / 60 years old level or over / An engineer / Useful /

- Purpose of use
- Educational project
- Comment/Request
- How can I improve the formula for use above 11km in altitude?

[8] 2016/07/07 17:22 Male / 30 years old level / Self-employed people / Useful /

- Purpose of use
- In order to calculate elevation using Arduino and BMP180 air pressure detector. It works like a magic!
- Comment/Request
- I'm not sure if this formula is the latest one.

[9] 2016/02/23 06:17 Male / 30 years old level / A teacher / A researcher / Very /

- Purpose of use
- Hello

Imagine an aircraft in cruise at FL 360 (i.e. z=36,000 feet with sea level reperence pressure =101396 HPa).

At this altitude, the Standard Air Temperature might be near -56° C.

In fact, Outside Air Temp is SAT + 13, that's to say -43°C

Now the aircraft is going into a convective air mass whose Temp is suddenly increasing to -19°C

What are thinking aircraft electronic flyinf computers (ADIRU) about that ???

[10] 2015/04/13 23:22 Male / 60 years old level or over / A retired people / Useful /

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