Digital map shape vector encoding method and position information transfer method
First Claim
1. A shape data coding method of coding data representing a shape representing geometric information, the method comprising the steps of:
- representing the shape using a node string, wherein each node of the node string is represented by position information having at least two elements;
converting one of the elements of the position information about each node of the node string to provide converted data so that the converted data pools about a predetermined value more than the others of the elements of the position information; and
coding the converted data.
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Abstract
It is an object to provide a method of coding the position information of a digital map in a small data volume by utilizing a compressing and coding technique. In a coding method of coding data indicative of a shape vector on a digital map, an arithmetic processing is carried out over position information about a node string and a shape which indicate the shape vector to be represented by data having a statistical deviation, and the data having the statistical deviation are coded to reduce a data volume. It is possible to considerably decrease a transmission data volume in the case in which the vector shape of the digital map is to be transferred.
53 Citations
3 Claims
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1. A shape data coding method of coding data representing a shape representing geometric information, the method comprising the steps of:
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representing the shape using a node string, wherein each node of the node string is represented by position information having at least two elements; converting one of the elements of the position information about each node of the node string to provide converted data so that the converted data pools about a predetermined value more than the others of the elements of the position information; and coding the converted data. - View Dependent Claims (2, 3)
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Specification