Patent US565321A successfully refreshed from Google Patents.
EP0807803A2
Expired / Lapsed
EP
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Road map information readout apparatus, recording medium and transmitting method
Assignee: Panasonic Holdings Corp
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Filing: 1997-05-15
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Granted: —
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Expires: 2017-05-15
Abstract
Abstract Road map information used in a vehicle navigation or the like is classified into main road groups comprising roads high in frequency of utilization for route searching processing or the like and minor street groups comprising roads low in frequency of utilization. Information relating to the roads belong to the main road group are recorded in such a format that 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 reduction of a capacity required for recording precedes 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, to reduce the amount of information to be recorded.
Inventors
- 👤 Yasuhiro Ihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:51
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/123; G08G1/133; G08G1/137; G09; G09B; G09B29/00; G09B29/10; G09B29/106; G01; G01C; G01C21/00; G01C21/38; G01C21/3863; G01C21/387
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
117 words
A road map information readout 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, different recording formats are respectively assigned to the plurality of groups, 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 said connection information corresponding to said predetermined readout range; and output means for outputting said connection information read out by said readout control means.
Claim 2
Dependent Claim
108 words
The road map information readout apparatus according to claim 1, wherein said plurality of groups include main road groups and sub road groups, the roads belonging to said main road group are relatively higher in frequency of use by a user than the roads belonging to said sub road group, the roads belonging to said sub road group are relatively lower in frequency of use by a user than the roads belonging to said main road group, and a recording format in which the recording efficiency of the road map information is higher than that assigned to said main road group is assigned to said sub road group.
Claim 3
Dependent Claim
75 words
The road map information readout apparatus according to claim 2 wherein the recording format assigned to said main road group is a recording format for recording for each node a table representing the connection state regarding each node, and the recording format assigned to said sub road group is a recording format for recording for each node information for specifying a node to succeed the node and a flag representing pen up or pen down.
Claim 4
Dependent Claim
71 words
The road map information readout apparatus according to claim 2, wherein in a road shape in which a first road belonging to said main road group and a second road belonging to said sub road group intersect each other, an auxiliary point representing said interconnection on said first road and information which can specify the auxiliary point from said second road are further recorded in said road map information recording medium.
Claim 5
Dependent Claim
71 words
The road map information readout apparatus according to claim 3, wherein in a road shape in which a first road belonging to said main road group and a second road belonging to said sub road group intersect each other, an auxiliary point representing said interconnection on said first road and information which can specify the auxiliary point from said second road are further recorded in said road map information recording medium.
Claim 6
Dependent Claim
63 words
The road map information readout apparatus according to claim 2, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded in said road map information recording medium.
Claim 7
Dependent Claim
63 words
The road map information readout apparatus according to claim 3, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded in said road map information recording medium.
Claim 8
Dependent Claim
63 words
The road map information readout apparatus according to claim 4, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded in said road map information recording medium.
Claim 9
Dependent Claim
63 words
The road map information readout apparatus according to claim 5, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded in said road map information recording medium.
Claim 10
Dependent Claim
106 words
A road map information readout apparatus, comprising: 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 said connection information corresponding to said predetermined readout range; and output means for outputting the connection information read out by said readout control means.
Claim 11
Dependent Claim
102 words
A road map information readout apparatus, comprising: 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 said interpolation points corresponding to said predetermined readout range; and output means for outputting said interpolation points read out by said readout control means.
Claim 12
Dependent Claim
62 words
A road map information recording medium, wherein roads included in all or part of areas on a road map are previously classified into a plurality of groups, different recording formats are respectively assigned to the plurality of groups, and connection information of the roads included in each of the groups is recorded in accordance with the recording format assigned to the group.
Claim 13
Dependent Claim
108 words
The road map information recording medium according to claim 12, wherein said plurality of groups include main road groups and sub road groups, the roads belonging to said main road group are relatively higher in frequency of use by a user than the roads belonging to said sub road group, the roads belonging to said sub road group are relatively lower in frequency of use by a user than the roads belonging to said main road group, and a recording format in which the recording efficiency of the road map information is higher than that assigned to said main road group is assigned to said sub road group.
Claim 14
Dependent Claim
75 words
The road map information recording medium according to claim 13, wherein the recording format assigned to said main road group is a recording format for recording for each node a table representing the connection state regarding each node, and the recording format assigned to said sub road group is a recording format for recording for each node information for specifying a node to succeed the node and a flag representing pen up or pen down.
Claim 15
Dependent Claim
64 words
The road map information recording medium according to claim 13, wherein in a road shape in which a first road belonging to said main road group and a second road belonging to said sub road group intersect each other, an auxiliary point representing said interconnection on said first road and information which can specify the auxiliary point from said second road are further recorded.
Claim 16
Dependent Claim
64 words
The road map information recording medium according to claim 14, wherein in a road shape in which a first road belonging to said main road group and a second road belonging to said sub road group intersect each other, an auxiliary point representing said interconnection on said first road and information which can specify the auxiliary point from said second road are further recorded.
Claim 17
Dependent Claim
56 words
The road map information recording medium according to claim 13, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 18
Dependent Claim
56 words
The road map information recording medium according to claim 14, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 19
Dependent Claim
56 words
The road map information recording medium according to claim 15, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 20
Dependent Claim
56 words
The road map information recording medium according to claim 16, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 21
Dependent Claim
51 words
A road map information recording medium, 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 of both the roads is recorded as connection information in one group.
Claim 22
Dependent Claim
60 words
A road map information recording medium on which road map information is recorded, wherein said 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.
Claim 23
Dependent Claim
85 words
A road map information transmitting method for transmitting to an apparatus using road map information the road map information by communication, wherein said road map information is information in which roads included in all or part of areas on a road map are previously classified into a plurality of groups, different recording formats are respectively assigned to the plurality of groups, and connection information of the roads included in each of the groups is recorded in accordance with the recording format assigned to the group.
Claim 24
Dependent Claim
108 words
The road map information transmitting method according to claim 23, wherein said plurality of groups include main road groups and sub road groups, the roads belonging to said main road group are relatively higher in frequency of use by a user than the roads belonging to said sub road group, the roads belonging to said sub road group are relatively lower in frequency of use by a user than the roads belonging to said main road group, and a recording format in which the recording efficiency of the road map information is higher than that assigned to said main road group is assigned to said sub road group.
Claim 25
Dependent Claim
75 words
The road map information transmitting method according to claim 24, wherein the recording format assigned to said main road group is a recording format for recording for each node a table representing the connection state regarding each node, and the recording format assigned to said sub road group is a recording format for recording for each node information for specifying a node to succeed the node and a flag representing pen up or pen down.
Claim 26
Dependent Claim
64 words
The road map information transmitting method according to claim 24, wherein in a road shape in which a first road belonging to said main road group and a second road belonging to said sub road group intersect each other, an auxiliary point representing said interconnection on said first road and information which can specify the auxiliary point from said second road are further recorded.
Claim 27
Dependent Claim
64 words
The road map information transmitting method according to claim 25, wherein in a road shape in which a first road belonging to said main road group and a second road belonging to said sub road group intersect each other, an auxiliary point representing said interconnection on said first road and information which can specify the auxiliary point from said second road are further recorded.
Claim 28
Dependent Claim
56 words
The road map information transmitting method according to claim 24, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 29
Dependent Claim
56 words
The road map information transmitting method according to claim 25, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 30
Dependent Claim
56 words
The road map information transmitting method according to claim 26, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 31
Dependent Claim
56 words
The road map information transmitting method according to claim 27, wherein said sub road group is further divided into a plurality of small groups, and connection information of the roads in each of said small groups and connection information of the roads connecting one or two or more of the adjacent small groups are further recorded.
Claim 32
Dependent Claim
74 words
A road map information transmitting method for transmitting to an apparatus using road map information the road map information by communication, wherein said 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.
Claim 33
Dependent Claim
71 words
A road map information transmitting method for transmitting to an apparatus using road map information the road map information by communication, wherein said road map information is information having road map information connecting the 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.
References Cited (Backward Citations)
No citation records indexed.
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