| 摘要 |
<p>A map data base can be used to assist GPS and other vehicle sensors (i.e., wheel speed, gyro,...) in location estimation by allowing techniques such as determining if location is valid or invalid, best-fit determination, and others. Reduction in map data dependency can be achieved by using it only in areas where GPS position is not reliable. Reduction in map data dependency can be in the form of reduced size of map data base, or reduced data transmission in conjunction with anticipating future map needs, if map data is not stored locally on device.</p> |
