Road map information readout apparatus, recording medium and transmitting method
First Claim
1. A road map information readout apparatus, said apparatus comprising:
- a road map information recording medium in which roads included in all or part of areas on a road map are previously classified into a plurality of groups in accordance with types of the roads, different recording formats are respectively assigned to the plurality of groups according to the types of the roads, and connection information of the roads included in each of the groups is recorded in accordance with the recording format assigned to the group;
readout range designation means for designating a predetermined readout range;
readout control means for reading out from said road map information recording medium the connection information corresponding to the predetermined readout range; and
output means for outputting the connection information read out by said readout control means.
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Accused Products
Abstract
Road map information used in a vehicle navigation or the like is classified into main road groups comprising roads having a high frequency of utilization for route searching processing or the like and minor street groups comprising roads having a low frequency of utilization. Information relating to the roads belong to the main road group are recorded in such a format that the processing speed precedes reduction of a capacity required for recording. On the contrary, information relating to the roads belonging to the minor street group are recorded in such a format that a reduction of a capacity required for recording precedes the processing speed. The minor street group is divided into a plurality of arbitrary small groups to decrease the range of minor streets requiring information to the utmost in the route searching processing or the like. Further, one road which can be represented with one stroke of the brush and roads branching from the road are recorded upon being integrated as one group. Consequently, it is possible to realize a road map information readout apparatus in which the recording efficiency of the road map information is increased, thereby reducing the amount of information to be recorded.
136 Citations
33 Claims
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1. A road map information readout apparatus, said apparatus comprising:
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a road map information recording medium in which roads included in all or part of areas on a road map are previously classified into a plurality of groups in accordance with types of the roads, different recording formats are respectively assigned to the plurality of groups according to the types of the roads, and connection information of the roads included in each of the groups is recorded in accordance with the recording format assigned to the group; readout range designation means for designating a predetermined readout range; readout control means for reading out from said road map information recording medium the connection information corresponding to the predetermined readout range; and output means for outputting the connection information read out by said readout control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A road map information readout apparatus, said apparatus comprising:
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a road map information recording medium in which a road whose connection state is represented with one stroke of the brush and at least one road branching from the road and having the same attribute are grouped, and connection information of both the roads is recorded as connection information in one group; readout range designation means for designating a predetermined readout range; readout control means for reading out from said road map information recording medium the connection information corresponding to the predetermined readout range; and output means for outputting the connection information read out by said readout control means.
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11. A road map information readout apparatus, said apparatus comprising:
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a road map information recording medium having road information for connecting nodes in the shape of a curve drawn on the basis of interpolation points by predetermined curve interpolation processing and having the interpolation points so recorded therein as to be positioned on the shape of the curve; readout range designation means for designating a predetermined readout range; readout control means for reading out from said road map information recording medium the interpolation points corresponding to the predetermined readout range; and output means for outputting the interpolation points read out by said readout control means.
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12. A road map information recording medium on which road map information is recorded, wherein:
roads included in all or part of areas on a road map are previously classified into a plurality of groups in accordance with types of the roads, different recording formats are respectively assigned to the plurality of groups according to the types of the roads, and connection information of the roads included in each of the groups is recorded in accordance with the recording format assigned to the group. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A road map information recording medium on which road map information is recorded, wherein:
a road whose connection state is represented with one stroke of the brush and at least one road branching from the road and having the same attribute are grouped, and connection information on both the roads is recorded as connection information in one group.
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22. A road map information recording medium on which road map information is recorded, wherein:
the road map information includes road information for connecting nodes in the shape of a curve drawn on the basis of interpolation points by predetermined curve interpolation processing, and has the interpolation points so recorded therein as to be positioned on the shape of the curve.
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23. A road map information transmitting method for transmitting road map information to an apparatus by performing a communication, wherein:
the road map information is information in which roads included in all part of areas on a road map are previously classified into a plurality of groups in accordance with types of the roads, different recording formats are respectively assigned to the plurality of groups according to the types of the roads, and connection information of the roads included in each of the groups is recorded in accordance with the recording format assigned to the group. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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32. A road map information transmitting method for transmitting road map information to an apparatus by performing a communication, wherein:
the road map information is information in which a road whose connection state is represented with one stroke of the brush and at least one road branching from the road and having the same attribute are grouped, and connection information of both the roads is recorded as connection information in one group.
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33. A road map information transmitting method for transmitting road map information to an apparatus road map information) by Performing a communication, wherein:
the road map information is information having road map information connecting nodes in the shape of a curve drawn on the basis of interpolation points by predetermined curve interpolation processing and having the interpolation points so recorded therein as to be positioned on the shape of the curve.
Specification