System and method for transferring navigation information using different coordinate systems
First Claim
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10. A method for preparing navigation information comprising the steps of:
- receiving a request for navigation information;
determining an overall route and constructing an overall map;
selecting a first portion of the overall map; and
determining whether the first portion is more efficiently encoded using relative or absolute coordinates.
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Abstract
A system and method for formatting and transferring navigation information is disclosed. The system and method can send and receive navigation information. The navigation information can be formatted and transferred using different coordinate systems. In some cases, an absolute coordinate system is used and in other cases, a relative coordinate system is used to encode or express various map features. This can assist in reducing the amount of information transferred and can facilitate rapid delivery of the navigation information.
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Citations
27 Claims
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10. A method for preparing navigation information comprising the steps of:
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receiving a request for navigation information;
determining an overall route and constructing an overall map;
selecting a first portion of the overall map; and
determining whether the first portion is more efficiently encoded using relative or absolute coordinates. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27)
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21. A method for preparing navigation information comprising the steps of:
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receiving a request for the navigation information;
preparing the navigation information using an absolute coordinate system and a relative coordinate system;
wherein the absolute coordinate system uses two bytes to define each absolute coordinate; and
wherein the relative coordinate system uses two bytes to define an initial coordinate and uses one byte to define a subsequent coordinate.
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25-1. The method according to claim 20, wherein a first portion of bits of the one byte are used to define a value for displacement in a first direction.
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26-2. The method according to claim 25, wherein a second portion of bits of the one byte are used to define a value for displacement in a second direction.
Specification