REFERENCING A MAP TO THE COORDINATE SPACE OF A POSITIONING SYSTEM
First Claim
1. A method of referencing a map to the coordinate space of a positioning system, the method comprising:
- for each of a plurality of real-world positions, associating the location of the real-world position in a coordinate space of the map, with a location in the coordinate space of the positioning system determined by taking at least one positioning-system reading at the real-world position; and
using the associated locations to determine a master transform for converting relative location information between said coordinate spaces, said relative location information serving to specify a location relative to the already-known locations of said plurality of real-world positions.
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Abstract
Methods and apparatus are provided for referencing a map to the coordinate space of a positioning system, such as a GPS system. For each of a number of real-world positions (X1, X2, X3), the location (LP1, LP2, LP3) of the real-world position in a coordinate space of the map, is associated with a location(LG1, LG2, LG3) in the coordinate space of the positioning system determined by taking at least one positioning-system reading at the real-world position (X1, X2, X3). Using these associated locations, a master transform is determined for converting relative location information between the coordinate spaces. The relative location information is information that serves to specify a location relative to the already-known locations and can take the form of displacement vector information.
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Citations
18 Claims
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1. A method of referencing a map to the coordinate space of a positioning system, the method comprising:
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for each of a plurality of real-world positions, associating the location of the real-world position in a coordinate space of the map, with a location in the coordinate space of the positioning system determined by taking at least one positioning-system reading at the real-world position; and using the associated locations to determine a master transform for converting relative location information between said coordinate spaces, said relative location information serving to specify a location relative to the already-known locations of said plurality of real-world positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Portable apparatus comprising:
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a positioning system for deriving a location in a coordinate space of the positioning system corresponding to a current real-world position of the apparatus; a user interface arranged to display a map and enable locations in the coordinate space of the map to be selected by/identified to a user; a memory for storing locations in both said coordinate spaces; and a processing arrangement arranged to associate the location in the coordinate space of the positioning system of a said current position of the apparatus with a corresponding location in the map coordinate space for a plurality of different said current positions, the processing arrangement being further arranged to use the associated locations to determine a master transform for converting relative location information between said coordinate spaces, said relative location information serving to specify a location relative to the already-known locations of said plurality of current positions.
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Specification