seaLevelForAltitude()
Calculates the pressure at sea level (in hPa) from the specified altitude (in meters), and atmospheric pressure (in hPa).. bpm.seaLevelForAltitude(altitude, atmospheric)bpm: a variable of type BMP280.
altitude: Altitude in meters.
atmospheric: Atmospheric pressure in hPa.
float - the pressure at sea level (in hPa) from the specified altitude