ais2geojson

A really fast and simple tool to parse AIS raw data into geojson. It processes AIS position message classes 1, 2, 3, 4, 9, 18, 19 line-by-line and outputs GeoJson:

echo '!BSVDM,1,1,,A,13oUhr0000151NhWKUi1vPvJ08Re,0*3A' | ais2geojson  | jq '.'
{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [
      15.078333,
      68.910833
    ]
  },
  "properties": {
    "mmsi": "259617000",
    "cog": 50.6,
    "sog": 0,
    "ts": false
  }
}

It can process around 350k messages per second. It currently takes in no arguments.

Timestamps prefix

As timestamps are not accurately present in the AIS messages themselves, ais2geojson will include the timestamp proceeding a ; if present. This lets you do:

echo '2017-02-20T00:00:00;!BSVDM,1,1,,A,13oUhr0000151NhWKUi1vPvJ08Re,0*3A' | ais2geojson  | jq '.'
{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [
      15.078333,
      68.910833
    ]
  },
  "properties": {
    "mmsi": "259617000",
    "cog": 50.6,
    "sog": 0,
    "ts": "2017-02-20T00:00:00"
  }
}

If the timestamp can be parsed as an integer, the JSON printout will reflect this:

$ echo '123;!BSVDM,1,1,,A,13oUhr0000151NhWKUi1vPvJ08Re,0*3A' | ./ais2geojson   | jq -c .properties
{"mmsi":"259617000","aistype":1,"cog":50.6,"sog":0,"smi":0,"ts":123}

TODO

• Allow command line arguments options to include/exclude fields

Credits

aisparser stolen from https://github.com/bcl/aisparser, simplified and reorganized here.

Anteo AS is publishing this piece of software with the BSD license.