Method and device for displaying road segments and method of providing a map data base
First Claim
1. A method of displaying road segments via an optical output device based on a map data base, which stores information on a road network in road vector data format, wherein a road segment is respectively represented by a vector, the method comprising:
- identifying a road segment for outputting via the optical output device;
retrieving, from the map data base, information on a direction vector of the identified road segment and a parameter value associated with the identified road segment;
selectively determining, based on the retrieved parameter value, a variation in shape of the identified road segment as a function of position along the direction vector;
generating a graphical representation of the road segment for outputting via the optical output device based on the information on the direction vector and, if available, the determined variation in shape;
determining, based on the map data base, whether the identified road segment has an end that does not allow vehicles to exit; and
the retrieving the parameter value and the determining the variation in shape being selectively performed if the identified road segment has an end which does not allow vehicles to exit.
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Abstract
A method and device for displaying road segments are provided. The method uses a map data base storing information on a road network in a road vector data format. Additional parameter values are stored for a subset of road segments. Information on a direction vector and the parameter value for a road segment are retrieved. Based on the parameter value, it is determined whether the road segment exhibits a variation in shape as a function of position along its direction vector. A graphical representation of the road segment is generated based on the retrieved parameter value and the direction vector.
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Citations
18 Claims
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1. A method of displaying road segments via an optical output device based on a map data base, which stores information on a road network in road vector data format, wherein a road segment is respectively represented by a vector, the method comprising:
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identifying a road segment for outputting via the optical output device; retrieving, from the map data base, information on a direction vector of the identified road segment and a parameter value associated with the identified road segment; selectively determining, based on the retrieved parameter value, a variation in shape of the identified road segment as a function of position along the direction vector; generating a graphical representation of the road segment for outputting via the optical output device based on the information on the direction vector and, if available, the determined variation in shape; determining, based on the map data base, whether the identified road segment has an end that does not allow vehicles to exit; and the retrieving the parameter value and the determining the variation in shape being selectively performed if the identified road segment has an end which does not allow vehicles to exit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of displaying road segments via an optical output device based on a map data base, which stores information on a road network in road vector data format, wherein a road segment is respectively represented by a vector, the method comprising:
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identifying a road segment for outputting via the optical output device; retrieving, from the map data base, information on a direction vector of the identified road segment and a parameter value associated with the identified road segment; selectively determining, based on the retrieved parameter value, a variation in shape of the identified road segment as a function of position along the direction vector; generating a graphical representation of the road segment for outputting via the optical output device based on the information on the direction vector and, if available, the determined variation in shape; and selectively retrieving, based on the retrieved parameter value, from the map data base at least one additional parameter value associated with the identified road segment, the variation in shape being determined based on the retrieved parameter value and the retrieved at least one further parameter value. - View Dependent Claims (9, 10, 11)
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12. A method of displaying road segments via an optical output device based on a map data base, which stores information on a road network in road vector data format, wherein a road segment is respectively represented by a vector, the method comprising:
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identifying a road segment for outputting via the optical output device; retrieving, from the map data base, information on a direction vector of the identified road segment and a parameter value associated with the identified road segment; selectively determining, based on the retrieved parameter value, a variation in shape of the identified road segment as a function of position along the direction vector; and generating a graphical representation of the road segment for outputting via the optical output device based on the information on the direction vector and, if available, the determined variation in shape, wherein the graphical representation of the road segment is generated to selectively exhibit, based on the retrieved parameter value, a boundary having a curved portion.
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13. A method of displaying road segments via an optical output device based on a map data base, which stores information on a road network in road vector data format, wherein a road segment is respectively represented by a vector, the method comprising:
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identifying a road segment for outputting via the optical output device; retrieving, from the map data base, information on a direction vector of the identified road segment and a parameter value associated with the identified road segment; selectively determining, based on the retrieved parameter value, a variation in shape of the identified road segment as a function of position along the direction vector; and generating a graphical representation of the road segment for outputting via the optical output device based on the information on the direction vector and, if available, the determined variation in shape, wherein the retrieved parameter value for the identified road segment is compared to a finite set of values to determine the variation in shape of the identified road segment, each one of the finite set of values being associated with one template shape of a finite set of template shapes.
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14. A vehicle navigation apparatus for displaying road segments, comprising:
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a storage device configured to store map data information on a road network in road vector data format, wherein a road segment is respectively represented by a vector; an optical output device; and a processor that identifies a road segment for outputting via the optical output device, retrieves from the storage device information on a direction vector of the identified road segment and a parameter value associated with the identified road segment, selectively determines based on the retrieved parameter value a variation in shape of the identified road segment as a function of position along the direction vector, and controls the optical output device based on the information on the direction vector and, if available, the determined variation in shape, to generate a graphical representation of the identified road segment. - View Dependent Claims (15, 16)
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17. A method of providing a map data base for vehicle navigation, wherein a direction vector is respectively stored in the map data base for a plurality of road segments, the method comprising:
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receiving information on a road segment having a direction vector, the information including information on a boundary of the road segment; determining, based on the information on the boundary, whether the road segment exhibits a variation in shape along the direction vector; and if the road segment exhibits the variation in shape, selecting a parameter value from a finite set of parameter values based on the information on the boundary and storing the selected parameter value associated with the road segment in the map data base. - View Dependent Claims (18)
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Specification