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c_common.py: return -999999 (extremely low, physically impossible) altitude in case altitude is unknown or invalid, bds04.py: convert -999999 altitude to None to better signal an invalid/unknown decoded altitude to the user

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This commit is contained in:
Paul de Jong 2023-12-18 16:40:44 +01:00
parent 77273153cb
commit eea09227b0
2 changed files with 7 additions and 2 deletions
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2
pyModeS/c_common.pyx
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@ -311,7 +311,7 @@ cpdef int altitude(str binstr):
if bin2int(binstr) == 0: if bin2int(binstr) == 0:
# altitude unknown or invalid # altitude unknown or invalid
alt = -9999 alt = -999999
elif Mbit == 48: # unit in ft, "0" -> 48 elif Mbit == 48: # unit in ft, "0" -> 48
if Qbit == 49: # 25ft interval, "1" -> 49 if Qbit == 49: # 25ft interval, "1" -> 49

7
pyModeS/decoder/bds/bds05.py
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@ -152,6 +152,11 @@ def altitude(msg: str) -> None | int:
if tc < 19: if tc < 19:
altcode = altbin[0:6] + "0" + altbin[6:] altcode = altbin[0:6] + "0" + altbin[6:]
return common.altitude(altcode) alt = common.altitude(altcode)
if alt != -999999:
return alt
else:
# return None if altitude is invalid
return None
else: else:
return common.bin2int(altbin) * 3.28084 # type: ignore return common.bin2int(altbin) * 3.28084 # type: ignore