Method and system for collecting traffic information

• US 6,798,357 B1
• Filed: 09/19/2002
• Issued: 09/28/2004
• Est. Priority Date: 09/19/2002
• Status: Expired due to Term

• Current Assignee: HERE Global B.V. (Nokia Corporation)
• Original Assignee: Navteq North America LLC (Nokia Corporation)
• Inventors: Khan, M. Salahuddin
• Primary Examiner(s): TWEEL JR, JOHN ALEXANDER
• Application Number:
  US10/247,399
• Time in Patent Office: 740 Days
• Field of Search: 340/989, 340/936, 340/990, 340/995.1, 340/995.13, 342/104, 342/105, 342/107, 342/454, 342/461, 701/117, 701/118, 701/119
• US Class Current: 340/989
• CPC Class Codes: G08G 1/0104 Measuring and analyzing of parameters relative to traffic conditions

Abstract

A system and method are disclosed for collecting traffic information. One or more aircraft, such as helicopters, fly predetermined flight paths above a geographic area. The flight paths are determined so that portions of roads for which traffic information are to be collected are within the ranges of remote velocity sensors located on board the aircraft during the flights of these aircraft along their respective flight paths. Each aircraft includes positioning equipment that allows the precise position (i.e., altitude, latitude, and longitude) and attitude (i.e., roll, pitch, and yaw) of the aircraft during its flight to be determined. During a flight along the predetermined flight path, the remote velocity sensor in each aircraft is operated to perform scans of locations on roadways in the geographic area. Using a precise road map database and taking into account the location, velocity and attitude of the aircraft while each scan is being made, data indicating traffic conditions along the roadways are collected.

Claims

1. A method of collecting data that indicate traffic conditions on roads in a geographic area comprising the steps of:

having an aircraft fly a flight path over the geographic area;

while said aircraft is flying over the geographic area, scanning locations along roads with a remote velocity sensing apparatus in said aircraft to obtain data indicative of traffic conditions at said locations;

using a map database to identify the roads that correspond to the locations scanned with the remote velocity sensing apparatus; and

associating the data indicative of traffic conditions at said locations with corresponding identities of said roads.

2. The method of claim 1 further comprising:

filtering data acquired by scanning to remove unwanted data readings.

3. The method of claim 2 wherein the filtering is performed in the aircraft.

4. The method of claim 2 wherein the filtering is performed in a base station to which the data acquired by scanning are sent.

5. The method of claim 1 further comprising:

determining transit times along the roads using the data indicative of traffic conditions associated with said roads.

6. The method of claim 1 wherein said aircraft flies along said flight path a plurality of successive times and further wherein said locations are scanned during each of said plurality of successive times to obtain data indicative of traffic conditions at successive times.

7. The method of claim 1 wherein the aircraft is a helicopter.

8. The method of claim 1 wherein the aircraft is a lighter-than-air aircraft.

9. The method of claim 1 further comprising:

determining the position of the aircraft while said aircraft is flying over the geographic area.

10. The method of claim 1 wherein a plurality of aircraft are used to obtain data indicative of traffic conditions throughout the geographic area, wherein each of said plurality of aircraft flies a separate different flight path over the geographic area.

11. The method of claim 1 wherein the flight path is predetermined.

12. The method of claim 1 further comprising:

using a detailed map database in the aircraft to precisely aim the remote sensing apparatus at the locations being scanned.

13. The method of claim 1 using a predetermined scan pattern to precisely aim the remote sensing apparatus at the locations being scanned.

14. The method of claim 1 further comprising:

transmitting the data indicative of traffic conditions at said locations from said aircraft to a base station where the map database is used to identify the roads that correspond to the locations scanned with the remote velocity sensing apparatus.

15. The method of claim 14 wherein the base station receives data indicative of traffic conditions from a plurality of aircraft each of which flies a separate different flight path over the geographic area and each of which scans locations along roads along its respective separate flight path with a separate remote velocity sensing apparatus located therein to obtain data indicative of traffic conditions at said scanned locations.

16. The method of claim 1 wherein a relatively wide area is scanned including the locations along the roads for which data indicative of traffic conditions are sought as well as areas outside the locations along the roads for which data indicative of traffic conditions are sought,

and wherein the method further comprises:

extracting from data obtained by scanning over the relatively wide area the data that pertain to the locations along the roads for which data indicative of traffic conditions are sought.

17. The method of claim 1 wherein the scanning is targeted at the locations along the roads for which data indicative of traffic conditions are sought to reduce scanning of areas other than the locations along the roads for which data indicative of traffic conditions are sought.

18. The method of claim 1 wherein said locations are in a direct line-of-sight of said aircraft when said aircraft flies along the flight path.

19. The method of claim 1 further comprising:

providing traffic information to drivers, wherein the traffic information corresponds to the locations scanned with the remote velocity sensing apparatus.

20. The method of claim 1 wherein said flight path comprises a substantially stationary position.

21. The method of claim 1 further comprising:

compensating for movement of said aircraft relative to said flight path when aiming the remote velocity sensor at the locations along the roads for which data indicative of traffic conditions are sought.

22. The method of claim 1 wherein said aircraft is unpiloted.

23. A system for collecting information about traffic conditions on roads in a geographic area comprising:

an aircraft having airborne traffic data collector components comprising;

a positioning system that determines a position of the aircraft while the aircraft is flying;

a remote velocity sensing apparatus;

a stabilization platform coupled to said remote velocity sensing apparatus;

an aiming apparatus that includes a real-motion compensating system,

wherein said aiming apparatus is coupled to said remote velocity sensing apparatus and responsive to said positioning system and wherein said aiming apparatus uses said real-motion compensating system to aim said remote velocity sensing apparatus at specific locations in the geographic area as the aircraft is flying along a flight path; and

an airborne communications system that transmits data indicative of traffic conditions sensed by said remote velocity sensing apparatus at said specific locations; and

a base station comprising;

a land-based communications system that receives the data indicative of traffic conditions sensed by the remote velocity sensing apparatus in said aircraft;

a geographic database containing data that represent roads in said geographic area including data that indicate locations of said roads; and

a data synthesis program that uses said geographic database to associate the data indicative of traffic conditions received from said aircraft with said roads.

24. The system of claim 23 wherein said base station receives data indicative of traffic conditions sensed by each of a plurality of aircraft each of which includes a separate set of airborne traffic data collector components and wherein said data synthesis program uses said geographic database to associate the data indicative of traffic conditions received from each of said plurality of aircraft with said roads.

25. The system of claim 24 wherein each of said plurality of aircraft fly different flight paths.

26. The system of claim 23 wherein said flight path is predetermined.

27. The system of claim 23 wherein said aircraft is a helicopter.

28. The system of claim 23 wherein said aircraft is a lighter-than-air aircraft.

29. The system of claim 23 wherein the remote velocity sensing apparatus in said aircraft is a laser-based device.

30. The system of claim 23 wherein the remote velocity sensing apparatus in said aircraft is a radar-based device.

31. The system of claim 23 wherein the remote velocity sensing apparatus in said aircraft is a lidar-based device.

32. The system of claim 23 wherein said aircraft has an airborne geographic database used by said aiming apparatus to determine said specific locations at which to aim said remote velocity sensing apparatus.

33. The system of claim 23 wherein said aircraft has data that indicate a predetermined flight path along which said aircraft flies while sensing traffic conditions.