average_alt¶
- sofia_redux.calibration.pipecal_util.average_alt(header)[source]¶
Robust average of altitude from FITS header.
Keys used are ALTI_STA and ALTI_END. If both are good (>= 0), they will be averaged. If only one is good, it will be returned. If both are bad, a PipeCalError will be raised.
Input values are expected in feet; return value is in kilo-feet, i.e. input values are divided by 1000 before returning.
- Parameters:
- header
astropy.io.fits.header.Header FITS header containing altitude keys.
- header
- Returns:
- float
The altitude value, in kilo-feet
- Raises:
- PipeCalError
If no valid altitude is found.