TAG_GPS_ALTITUDE_REF top-level constant
String
const TAG_GPS_ALTITUDE_REF
Indicates the altitude used as the reference altitude. If the reference is sea level and the altitude is above sea level, 0 is given. If the altitude is below sea level, a value of 1 is given and the altitude is indicated as an absolute value in TAG_GPS_ALTITUDE.
See also ALTITUDE_ABOVE_SEA_LEVEL See also ALTITUDE_BELOW_SEA_LEVEL
Implementation
const String TAG_GPS_ALTITUDE_REF = "GPSAltitudeRef";