AIS Library in Elixir. This library can decode the common NMEA 0183 v4.0 format sentences relating to AIS. It also handles the tag block prefix common to satellite AIS providers such as Spire:
\c:1503079500*55\!AIVDM,1,1,,B,C6:b0Kh09b3t1K4ChsS2FK008NL>`2CT@2N000000000S4h8S400,0*50
and message groups.
It also provides a number of components for building and maintaining an in memory state based upon the processed AIS data:
%AIS.Data.AisState{
vessels: %{}, # A list of current vessels
position_updates: [], # The latest position updates
trips: %{}, # A list of current trips
trip_updates: [], # The latest trip updates
index: QuadKeyTree.create(), # A quad-tree geospatial index of vessel potions
latest: %{} # The timestamps of the latest updates for each data provider
}The AIS.Processor GenServer is the process for creating and maintaining this state.
It provides a number of callbacks for creating and querying state:
handle_call({:decoded, decoded}, _from, state): update state given a list of decoded messageshandle_call({:get_tile, x, y, z}, _from, state): get all vessels for a given web mercator map tilehandle_call({:get_entity, id}, _from, state): get the details for a given entity id
Decoded messages presented to handle_call({:decoded, decoded}, _, _) take the form:
%{
:mmsi => 636016337,
:timestamp => ~U[2024-02-15 14:30:46Z],
:ship_type => 70,
:formatter => "VDM",
"q" => "",
"g" => "1-2-20395571",
"c" => "1708007446",
:padding => "0",
:dimension_to_stern => 29,
:destination => "PABLB",
:repeat_indicator => 1,
:position_fix_type => 1,
:eta => %{month: 2, day: 14, minute: 0, hour: 20},
:channel => "A",
:sequential => "1",
:name => "EVANGELIA D",
"p" => "spire",
:dte => 0,
:dimension_to_starboard => 13,
:current => "1",
:msg_type => 5,
:checksum => "16",
"s" => "",
:dimension_to_port => 19,
:spare => 0,
:imo_number => 9689184,
:call_sign => "D5FQ3",
:payload => "5INSFlH2Cn60CDI7>20EH4pLDhT60B2222222216EHMC=4WD0ND0@S0`888888888888880",
:draught => 12.1,
:ais_version_indicator => 2,
:talker => "!AI",
:dimension_to_bow => 171,
:total => "1"
}
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