Apparatus and method for creating a navigation map
First Claim
Patent Images
1. A vehicle navigation system that receives sensor data from a plurality of sensors, and provides a map image that is presented on a display, said system comprising:
- a navigation map data memory that includes map data indicative of roadways stored in Cornu spiral form; and
a navigation processing unit that receives the sensor data, and requests map data from said navigation map data memory associated with the sensor data, and computes the map image from said map data.
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Abstract
To display a navigation map for a navigation device more accurately and realistically and with less memory capacity, roads, railroad lines, rivers, lakes, and similar cartographic parameters are composed not of straight lines but of Cornu spirals. A Cornu spiral is defined by its curvature and its length.
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Citations
17 Claims
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1. A vehicle navigation system that receives sensor data from a plurality of sensors, and provides a map image that is presented on a display, said system comprising:
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a navigation map data memory that includes map data indicative of roadways stored in Cornu spiral form; and
a navigation processing unit that receives the sensor data, and requests map data from said navigation map data memory associated with the sensor data, and computes the map image from said map data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle navigation system that receives sensor data from a plurality of sensors, and provides a map image that is presented on a display, said system comprising:
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a navigation map data memory that includes map data indicative of roadways stored in Cornu spiral form; and
means for receiving the sensor data, for requesting map data from said navigation map data memory associated with the sensor data, and for computing the map image from said map data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of computing a map image in a vehicle navigation system that receives sensor data from a plurality of sensors, comprising:
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providing map data indicative of roadways stored in Cornu spiral form in a navigation map data memory device;
receiving the sensor data, and in response thereto requesting map data from said navigation map data memory device; and
computing the map image from said map data.
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Specification