Method and system for compact representation of routes
First Claim
1. A database that represents geographic features located in a region, the database comprising:
- data representations of intersections of roads located in the region; and
for each data representation of an intersection, data that indicate road segments that meet at the intersection; and
data that indicate nominal paths through the intersection, wherein said data that represent nominal paths associate each entrance road segment into the intersection with one, and only one, exit road segment.
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Abstract
A method for representing a route along a road network in a geographic region is disclosed. A database includes data representations of intersections of roads in the geographic region. Associated with the data representation for each intersection of roads are data indicating one or more nominal paths through the intersection. The nominal paths through an intersection identify, for each road segment by which the represented intersection can be entered, one and only one road segment from which the represented intersection is exited. The route is represented by indicating each intersection at which the route deviates from the nominal path into the intersection.
47 Citations
9 Claims
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1. A database that represents geographic features located in a region, the database comprising:
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data representations of intersections of roads located in the region; and
for each data representation of an intersection, data that indicate road segments that meet at the intersection; and
data that indicate nominal paths through the intersection, wherein said datathat represent nominal paths associate each entrance road segment into the intersection with one, and only one, exit road segment. - View Dependent Claims (2, 3, 4)
for each data representation of an intersection, data that indicate the geographic coordinates of the intersection.
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3. The invention of claim 1 wherein the exit road segment associated with an entrance road segment is that road segment onto which a motorist is most likely to travel from the entrance road segment.
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4. The invention of claim 1 wherein the data that indicate road segments that meet at the intersection indicate, for each road segment into the intersection, each road segment from which the intersection can be exited.
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5. A database that represents geographic features located in a region, the database comprising:
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data representations of intersections of roads located in the region;
successor data that indicate, for each entrance road segment along which a represented intersection can be entered, each successor road segment from which the intersection can be exited; and
in addition to said successor data, nominal path data that indicate, for each entrance road segment, one, and only one, of the successor road segments associated with the entrance road segment. - View Dependent Claims (6, 7, 8, 9)
for each data representation of an intersection, data that indicate the geographic coordinates of the intersection.
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9. The invention of claim 5 wherein the exit road segment associated with an entrance road segment by the nominal path data is that road segment onto which a motorist is most likely to travel from the entrance road segment.
Specification