Navigation method and system for accurately estimating positions of street address numbers
First Claim
1. A navigation method for determining a position of a street address number, comprising the steps of:
- receiving a street address number of a destination specified by a user;
retrieving data indicating a street segment which includes the specified street address number thereon from a map information storage;
searching for supplemental data regarding a place associated with the retrieved street segment including information indicating absolute position of the place and retrieving the supplemental data from the map information storage;
defining two or more absolute positions on the street segment with use of the supplemental data and the street segment data;
selecting two absolute positions on the street segment that have the specified street address number therebetween; and
determining a position of the specified address number by interpolating a length between the two selected absolute positions with a constant interval;
said step of defining two or more absolute positions on the street segment includes a step of drawing a reference line perpendicular to the street segment from a selected point of the place showing the absolute position on the place where said reference line is an imaginary line drawn for determining said absolute position.
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Accused Products
Abstract
A navigation method and system determines a more accurate position of a street address number with use of building footprint information or latitude/longitude information of POI (point of interest), thereby accurately defining a position of a destination. When a user specifies a street address number as his destination, the navigation system retrieves the street segment that should include the location of the specified address number therein. The navigation system also checks the map data as to whether there is any building footprint data or POI position data associated with the street segment. The navigation system selects absolute locations on the street segment based on the building footprint data or the POI position data and determines the location of the specified address number by interpolating between two absolute locations.
61 Citations
18 Claims
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1. A navigation method for determining a position of a street address number, comprising the steps of:
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receiving a street address number of a destination specified by a user; retrieving data indicating a street segment which includes the specified street address number thereon from a map information storage; searching for supplemental data regarding a place associated with the retrieved street segment including information indicating absolute position of the place and retrieving the supplemental data from the map information storage; defining two or more absolute positions on the street segment with use of the supplemental data and the street segment data; selecting two absolute positions on the street segment that have the specified street address number therebetween; and determining a position of the specified address number by interpolating a length between the two selected absolute positions with a constant interval; said step of defining two or more absolute positions on the street segment includes a step of drawing a reference line perpendicular to the street segment from a selected point of the place showing the absolute position on the place where said reference line is an imaginary line drawn for determining said absolute position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A navigation system for determining a position of a street address number, comprising:
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means for receiving a street address number of a destination specified by a user; means for retrieving data indicating a street segment which includes the specified street address number thereon from a map information storage; means for searching for supplemental data regarding a place associated with the retrieved street segment including information indicating absolute position of the place and for retrieving the supplemental data from the map information storage; means for defining two or more absolute positions on the street segment with use of the supplemental data and the street segment data; means for selecting two absolute positions on the street segment that have the specified street address number therebetween; and means for determining a position of the specified address number by interpolating a length between the two selected absolute positions with a constant interval; said means for defining two or more absolute positions on the street segment includes means for drawing a reference line perpendicular to the street segment from a selected point of the place showing the absolute position on the place where said reference line is an imaginary line drawn for determining said absolute position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification