Map display apparatus
First Claim
1. A map display apparatus comprising:
- a table storage device that stores a conversion table for converting data for displaying a map as a planar map to data for displaying said map as a bird'"'"'s-eye-view map created through bird'"'"'s-eye-view projection, said conversion table being prepared in advance via calculations; and
a bird'"'"'s-eye-view map display data preparation device that prepares bird'"'"'s-eye-view map display data for displaying said bird'"'"'s-eye-view map on a monitor based upon said data from said conversion table.
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Accused Products
Abstract
A navigation system for vehicles comprises a read device that reads planar map data from a recording medium which stores in memory planimetric map data of a road map, a current position detection device that detects the current position of the vehicle, a storage circuit that stores in memory function tables for converting positional coordinates of nodes included in a road map area around the detected current position to positional coordinates of nodes on a bird'"'"'s-eye-view map obtained by looking down upon the road map in a specific direction, at a specific look-down angle and a specific aspect angle from a viewpoint set above the vicinity of the detected current position and a bird'"'"'s-eye-view map display data preparation circuit that reads out data related to coordinate positions of nodes on the bird'"'"'s-eye-view map by operating the conversion table with the coordinate positions of nodes on the road map and prepares bird'"'"'s-eye-view map display data for displaying the bird'"'"'s-eye-view map on the monitor based upon the data thus read out.
37 Citations
22 Claims
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1. A map display apparatus comprising:
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a table storage device that stores a conversion table for converting data for displaying a map as a planar map to data for displaying said map as a bird'"'"'s-eye-view map created through bird'"'"'s-eye-view projection, said conversion table being prepared in advance via calculations; and a bird'"'"'s-eye-view map display data preparation device that prepares bird'"'"'s-eye-view map display data for displaying said bird'"'"'s-eye-view map on a monitor based upon said data from said conversion table. - View Dependent Claims (2, 3, 4, 15, 16)
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5. A map display apparatus comprising:
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a table storage device that stores a function table for converting positional coordinates of nodes for expressing a road map to positional coordinates of said nodes on a bird'"'"'s-eye-view map to be displayed through a bird'"'"'s-eye-view projection, said function table being prepared in advance via calculations; and a bird'"'"'s-eye-view map display data preparation device that prepares bird'"'"'s-eye-view map display data for displaying said bird'"'"'s-eye-view map based upon data converted by said function table. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 17, 18)
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13. A navigation system for vehicles comprising:
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a read device that reads planimetric map data from a recording medium that stores said planimetric map data of a road map; a current position detection device that detects a current position of a vehicle; a storage device that stores function tables for converting positional coordinates of nodes included in a road map area around said current position thus detected to positional coordinates of nodes on a bird'"'"'s-eye-view map obtained by looking down upon said road map in a predefined direction, at a predefined look-down angle and with a predefined aspect angle from a viewpoint set above a vicinity of said detected current position, said function table being prepared in advance via calculations; and a bird'"'"'s-eye-view map display data preparation device that reads out data related to coordinate positions of nodes on said bird'"'"'s-eye-view map by operating said function tables with coordinate positions of nodes on said road map and prepares bird'"'"'s-eye-view map display data for displaying said bird'"'"'s-eye-view map on a monitor based upon the data thus read out. - View Dependent Claims (21, 22)
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14. A recording medium for a navigation system, set in a processing apparatus connected to a storage device that stores in memory planimetric map data of a road map and a current position detection device for detecting a current position of a vehicle, storing a program that executes:
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a procedure through which said planimetric map data are read from said storage device; a procedure through which a current position is read from said current position detection device; a procedure through which function tables are operated, said function tables including data for converting positional coordinates of nodes contained in said road map area in a vicinity of a detected current position to positional coordinates of nodes on a bird'"'"'s-eye-view map obtained by looking down upon said road map in a predefined direction, at a predefined look-down angle and with a predefined aspect angle from a viewpoint set above a vicinity of said detected current position, said function table being prepared in advance via calculations; and a procedure through which data related to coordinate positions of nodes on said bird'"'"'s-eye-view map are read out by operating said function tables with positional coordinates of nodes on said road map and bird'"'"'s-eye-view map display data for displaying said bird'"'"'s-eye-view map on a monitor are prepared based upon said data thus read out. - View Dependent Claims (19, 20)
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Specification