Multilevel sliced sheet processing method for vector map data

Abstract

The invention discloses a multilevel slice processing method for vector map data, which comprises multilevel slice generation step and map synthesis step; wherein, (1) the multilevel slice generation comprises the steps as follows: firstly, the map can be divided into four equal parts at L level (wherein, the L equals to the whole number from 1 to m), so as to obtain an L-level square area; and then the elements which are intersected with the L-level square area with the L weighing rank or partnership level can come under to <the multilevel slice data set>. When the detail data of the elements are excessive, the elements come under one group of the multilevel slice by utilizing the increment method; (2) the synthesis of an area A map under the L-level scale comprises the steps as follows:firstly, the congregation which is intersected with the area A and is composed of the L-level slice can be searched; then, the elements or the increment of the slice and the former slice thereof can be integrated; finally, the elements can be spliced together according to the space proximity relation so as to obtain the whole map. In the position service, the multilevel slice can be taken as a map data transmitting unit, so as to be good for one side of a mobile termination to cache the map data and reduce the data communication amount; and the increment process for the detail data can reducethe calculation load of the mobile termination.

Description

technical field [0001] The invention mainly relates to the field of geographic information systems, in particular to a multi-level slice processing method for vector map data, which is mainly applicable to the fields of vector map data transmission and the like. 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 there is no pre-stored map set...

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

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

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