Sea area information generation method and sea area information generation device

A sea area information generation method comprising:

• acquiring, by a processor, positional information including positions of a plurality of ships at a plurality of timings;
• acquiring, or generating from the positional information, sailing route information of the plurality of ships by the processor;
• and
• generating, by the processor, closest distance information for each sea area corresponding to positions of closest approach of two ships from the positional information and the sailing route information, the closest distance information including a statistical quantity of a distance of closest approach between the two ships, the statistical quantity of a distance of closest approach being calculated based on encountering relationship for directions of the two ships and whether or not ship tracks of the two ships are along a sailing route in the sea area.

A sea area information generation device comprising:

• a processor that executes a process, the process comprising:
• acquiring positional information including positions of a plurality of ships at a plurality of timings;
• acquiring, or generating from the positional information, sailing route information of the plurality of ships;
• and
• generating closest distance information for each sea area corresponding to positions of closest approach of two ships, from the positional information and the sailing route information, the closest distance information including a statistical quantity of a distance of closest approach between the two ships, the statistical quantity of a distance of closest approach being calculated based on encountering relationship for directions of the two ships and whether or not ship tracks of the two ships are along a sailing route in the sea area.