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Vector map data transmission method based on multi-stage slicing mode

A vector map data and transmission method technology, which is applied in the field of vector map data transmission based on multi-level slicing, can solve the problems of short continuous power supply time, unstable channels, increased connection times and communication volume, and reduce communication connections Number of times, reduction in data communication volume, effect of communication volume reduction

Inactive Publication Date: 2009-06-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, wireless communication consumes more power, and the power supply of mobile terminals lasts for a short time
Second, the amount of map data is large, and the wireless network sometimes has unstable channels and low bandwidth
Online transmission uses map elements as the basic unit, and there are the following problems: First, every time the mobile terminal enters a new target area, it must send a data request to the server
This increases unnecessary connections and traffic
Second, the elements sent to the mobile terminal contain all the details, and some details are not used on the small scale map

Method used

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  • Vector map data transmission method based on multi-stage slicing mode
  • Vector map data transmission method based on multi-stage slicing mode
  • Vector map data transmission method based on multi-stage slicing mode

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

[0044] (1) The map data transmission from the server to the mobile terminal takes multi-level slices as the basic unit. Multi-level tiles have two meanings. One is a square area in the map, and the other is a set of map elements / increments of the same weight that intersect with the area. The steps to generate multi-level slices are as follows:

[0045] 1) slice. First, divide the full map vertically and horizontally into 4 equal slices to obtain the first-level slice; then divide each level-1 multi-level slice into 4 equal slices to obtain the second-level slice (a total of 4 2 =16 blocks); ..., and so on, until the m-th slice is generated. For each split, the cut is called the parent slice, and the resulting four slices are called sub-slices.

[0046] Multi-level slices are numbered using the following method. First, the four first-l...

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Abstract

The invention discloses a vector map data transmission method based on the multilevel slice mode, which comprises steps: firstly dividing a map into four parts through L (L=1, 2,..., m) to obtain an L-level square region, then felling intersectant elements with weight level of L or elements with the pairing level in the square region under a data set named as a multilevel slice, secondly using the multilevel slice as a basic unit for the map data transmission from a server terminal to a mobile terminal, thirdly integrating the elements of each level of slices and ancestor slices thereof firstly after the mobile terminal receives the multilevel slice, and then piecing the slices together into a complete map of a mobile terminal target region, and finally caching the multilevel slice on one side of the mobile terminal. Each renovation firstly searches the multilevel slice from a local buffer, or searches from the server if the local buffer does not have the multilevel slice. The method has the advantages that one side of the mobile terminal can reuse the map data stored on the local at high proportion, thereby reducing the communication of the map data transmission.

Description

technical field [0001] The invention mainly relates to the field of geographic information systems, in particular to a vector map data transmission method based on multi-level slicing. Background technique [0002] With the rapid development of wireless communication technology, Location-based Service (LBS) is expected to become a killer application. The LBS application system consists of a server, a mobile terminal and a wireless communication network connecting the two. Mobile terminals have the characteristics of small screen, short continuous power supply time, less storage resources, and low CPU computing power. There are problems such as channel instability and low bandwidth in wireless communication networks. [0003] The online transmission of map data in the LBS application system can provide users with real-time information that meets individual needs and is rich in content, and there is no pre-stored map set in the mobile terminal, which does not require user up...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/18G06F17/30G09B29/00
Inventor 叶常春王晓东周兴铭徐明罗金平
Owner NAT UNIV OF DEFENSE TECH
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