COMMUNICATING ELECTRONIC MAP DATA
First Claim
1. :
- A method of communicating electronic map data to a remote vehicle, comprising a first data processing terminal interfaced with a vehicle-borne map data processing terminal over a network connection, the method performed at the first data processing terminal comprising the steps of;
compiling map data as at least one cell comprising a plurality of vector data records and a plurality of feature data records;
compressing the compiled cell data;
encrypting and digitally signing the compressed cell data; and
transmitting the encrypted and digitally signed cell data over the network;
characterised in that the step of compiling comprises the further step of reducing the respective bit length of a plurality of vector data values.
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Accused Products
Abstract
A method of communicating electronic map data is disclosed, wherein map data is compiled as at least one cell comprising a plurality of vector data records and a plurality of feature data records to, for instance, the IHO S-57 standard. During the compilation, the respective bit lengths of a plurality of vector data values are reduced and both the bit-reduced vector data values and feature data values are entropy encoded. The compiled cell data, which may be an Electronic Navigational Chart, is then compressed, encrypted and digitally signed according to, for instance, the IHO S-63 standard. The encrypted and digitally signed cell data is eventually transmitted to a remote navigational system, which may be an Electronic Chart Display and Information System, over a network, for instance in a satellite telecommunication. A system embodying the method is also disclosed.
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Citations
19 Claims
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1. :
- A method of communicating electronic map data to a remote vehicle, comprising a first data processing terminal interfaced with a vehicle-borne map data processing terminal over a network connection, the method performed at the first data processing terminal comprising the steps of;
compiling map data as at least one cell comprising a plurality of vector data records and a plurality of feature data records; compressing the compiled cell data; encrypting and digitally signing the compressed cell data; and transmitting the encrypted and digitally signed cell data over the network; characterised in that the step of compiling comprises the further step of reducing the respective bit length of a plurality of vector data values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- A method of communicating electronic map data to a remote vehicle, comprising a first data processing terminal interfaced with a vehicle-borne map data processing terminal over a network connection, the method performed at the first data processing terminal comprising the steps of;
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9. :
- A system for communicating electronic map data to a remote vehicle, comprising a first data processing terminal interfaced with a vehicle-borne map data processing terminal over a network connection, wherein the first data processing terminal comprises
electronic map data compiling means adapted to compile map data as at least one cell comprising a plurality of vector data records and a plurality of feature data records; data compressing means adapted to compress, encrypt and digitally sign cell data; and networking means adapted to transmit the encrypted and digitally signed cell data over the network to the vehicle-borne map data processing terminal; characterised in that the electronic map data compiling means is further adapted to reduce the respective bit length of a plurality of vector data values. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 19)
- A system for communicating electronic map data to a remote vehicle, comprising a first data processing terminal interfaced with a vehicle-borne map data processing terminal over a network connection, wherein the first data processing terminal comprises
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18. :
- A set of instructions recorded on a data carrying medium which, when processed by a data processing terminal connected to a network, configures the terminal to;
compile map data as at least one cell comprising a plurality of vector data records and a plurality of feature data records;
compress the compiled cell data;encrypt and digitally sign the compressed cell data; and transmit the encrypted and digitally signed cell data over the network data to a remote vehicle having a vehicle-borne map data processing terminal; characterised in that the set of instructions further configures the terminal to reduce the respective bit length of a plurality of vector data values.
- A set of instructions recorded on a data carrying medium which, when processed by a data processing terminal connected to a network, configures the terminal to;
Specification