嵌入式GIS中矢量数据的快速显示方法研究  

Study on Fast Displaying Vector Data in Embedded GIS

作　　者：黄雁 冯艳杰 孟庆祥[3] 

机构地区：[1]武汉市测绘研究院,湖北武汉430022 [2]深圳供电规划设计院有限公司,广东深圳518054 [3]武汉大学,湖北武汉430079

出　　处：《城市勘测》2012年第1期20-23,共4页Urban Geotechnical Investigation & Surveying

基　　金：国家自然科学基金青年基金(40801152)

摘　　要：嵌入式GIS是近年来一个蓬勃兴起的领域,由于嵌入式设备内存小,外设容量小,CPU的运算能力较弱,致使电子地图显示时常出现延迟和抖动的现象。本文针对嵌入式GIS海量矢量数据,提出了一种改进的多层网格索引技术对矢量数据进行检索,在矢量数据的显示方面,本文采用了双缓存显示机制代替了系统默认的显示机制,主缓存用于数据的显示,备用缓存用于组织下一个画面的数据,如此提高显示效率。Embedded Geographic Information System（EGIS） is a new rising and flourishing domain.Because the memory of EGIS is low and small,CPU＇s computing capability is weak,and the display screen is small,it would cause delay and jitter when the vector map was displaying.This paper would solve the problem of delay of vector data and present a kind of improved multi-level grid index technology to retrieve vector data.In the respect of data displaying,this paper adopts double buffer display mechanism instead of the default display mechanism of the system,the main buffer is used to display the vector map,while the auxiliary buffer is used to organize the data which would show later,and so on to increase desplaying efficiency.

关 键 词：嵌入式GIS 矢量数据 网格索引 

分 类 号：P208.1[天文地球—地图制图学与地理信息工程]