Method of determining trajectories through one or more junctions of a transportation network

1. A system for determining trajectories through at least one junction of a transportation network for display on a visual representation of a digital map, the digital map comprising data that is a digital representation of the transportation network, the system comprising one or processors arranged to:

obtain positional information comprising a plurality of traces relating to the movement of a plurality of mobile devices with respect to time on the transportation network through an area comprising the at least one junction, the border of the area being divided into a plurality of segments;

use said positional information to create an entry histogram by determining a count of the traces entering the area at each segment of the border and to create an exit histogram by determining a count of the traces exiting the area at each segment of the border;

connect one or more sequences of segments along the border having non-zero entries in the entry histogram to define at least one entry gate;

connect one or more sequences of segments along the border having non-zero entries in the exit histogram to define at least one exit gate;

use said positional information to assign, for pairs of entry and exit gates, a trajectory through the area; and

display, on a display device of the system, at least one of the determined trajectories through the area superimposed on a visual representation of at least the portion of the digital map representative of the area.

2. The system of claim 1 , wherein the positional information is positional information relating to the movement of a plurality of mobile devices with respect to time in a given time period.

3. The system of claim 1 , wherein the positional information comprises a plurality of traces, each trace composed of a plurality of time-sampled geographic positions.

4. The system of claim 3 , wherein the trajectory for a pair of entry and exit gates comprises one of the traces of the positional information associated with the pair of entry and exit gates.

5. The system of claim 3 , further comprising grouping some or all of the traces of the positional information associated with a pair of entry and exit gates to determine the trajectory for the pair of entry and exit gates.

6. The system of claim 1 , further comprising storing the determined trajectories in a data storage device.

7. The system of claim 1 , wherein the trajectories originating from the same entry gate are displayed using at least one common characteristic.

8. A non-transitory computer readable medium having computer software stored thereon, said computer software operable, when executed on a computer, to cause the computer to perform a method of determining trajectories through at least one junction of a transportation network for display on a visual representation of a digital map, the digital map comprising data that is a digital representation of the transportation network, the method comprising:

obtaining positional information comprising a plurality of traces relating to the movement of a plurality of mobile devices with respect to time on the transportation network through an area comprising the at least one junction, the border of the area being divided into a plurality of segments;

using said positional information to create an entry histogram by determining a count of the traces entering the area at each segment of the border and to create an exit histogram by determining a count of the traces exiting the area at each segment of the border;

connecting one or more sequences of segments along the border having non-zero entries in the entry histogram to define at least one entry gate;

connecting one or more sequences of segments along the border having non-zero entries in the exit histogram to define at least one exit gate;

using said positional information to assign, for pairs of entry and exit gates, a trajectory through the area; and

displaying, on a display device, at least one of the determined trajectories through the area superimposed on a visual representation of at least the portion of the digital map representative of the area.

9. The non-transitory computer readable medium of claim 8 , wherein the positional information is positional information relating to the movement of a plurality of mobile devices with respect to time in a given time period.

10. The non-transitory computer readable medium of claim 8 , wherein the positional information comprises a plurality of traces, each trace composed of a plurality of time-sampled geographic positions.

11. The non-transitory computer readable medium of claim 8 , wherein the trajectory for a pair of entry and exit gates comprises one of the traces of the positional information associated with the pair of entry and exit gates.

12. The non-transitory computer readable medium of claim 8 , further comprising grouping some or all of the traces of the positional information associated with a pair of entry and exit gates to determine the trajectory for the pair of entry and exit gates.

13. The non-transitory computer readable medium of claim 8 , further comprising storing the determined trajectories in a data storage device.

14. The non-transitory computer readable medium of claim 8 , wherein the trajectories originating from the same entry gate are displayed using at least one common characteristic.

15. The non-transitory computer readable medium of claim 14 , wherein the at least one common characteristic is line color and/or line style.