pyAISm
A small and incomplete python decoder for AIS messaging.
A bunch of naive pythons functions to decode somes ais_data/AIVDM messages:
Based on the doc here: (http://catb.org/gpsd/AIVDM.html).
How to use it
In python 2 console:
> msg = '!AIVDO,1,1,,,B00000000868rA6<H7KNswPUoP06,0*6A' # standard AIVDO sentence as a string
> ais_data = decod_ais(msg) # Return a dictionnary
> ais_format = format_ais(ais_data) # A more human readable dictionnary
> print ais_data, ais_data['lon'], ais_format['lon'] # Accessing the value of the keyDecode a file:
def decode_file_example():
"""
Example for decoding a file
:return:
"""
with open("ais.exploratorium.edu", "r") as file:
for aline in file:
try:
msg = aline.rstrip("\n")
ais_data = pyAISm.decod_ais(msg) # Return a dictionnary
ais_format = pyAISm.format_ais(ais_data) # A more human readable dictionnary
print(ais_format) # Accessing the value of the key
except pyAISm.UnrecognizedNMEAMessageError as e:
print e
except pyAISm.BadChecksumError as e:
print e
except Exception as e:
print e
print('End of file')Decode a stream:
def decode_stream_example():
"""
Example for decoding an online data stream
:return:
"""
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("ais.exploratorium.edu", 80))
s.sendall("GET / HTTP/1.1\r\nHost: www.cnn.com\r\n\r\n".encode())
while (True):
msg = (s.recv(4096).decode('utf-8')).splitlines()
for m in msg:
try:
msg = m.rstrip("\n")
ais_data = pyAISm.decod_ais(msg) # Return a dictionnary
ais_format = pyAISm.format_ais(ais_data) # A more human readable dictionnary
print(ais_format) # Accessing the value of the key
except pyAISm.UnrecognizedNMEAMessageError as e:
print e
except pyAISm.BadChecksumError as e:
print e
except Exception as e:
print e