嵌入式GIS地图快速显示方法的应用  

Application of Fast Displaying Method of Maps in Embedded GIS

作　　者：安晓博[1] 陈蜀宇[2] 刘小威[1] 

机构地区：[1]重庆大学计算机学院,重庆400030 [2]重庆大学软件学院,重庆400030

出　　处：《计算机系统应用》2012年第10期204-207,共4页Computer Systems & Applications

基　　金：重庆市自然科学基金(2008BB2307)

摘　　要：为提高嵌入式GIS环境下矢量地图的显示速度,设计了一种适用于嵌入式环境基于LOD的地图数据组织模型.针对嵌入式设备硬件条件限制,从减少非显示区域的冗余地图数据的读取和提高外存检索矢量数据的效率两方面入手,对矢量地图数据进行了分层、分块和建立索引等处理.通过实验表明,该方法能很好地提高矢量地图的显示速度,可以满足嵌入式环境下地图快速显示的要求.In order to improve the speed of vector map rendering in embedded GIS, a organization model of map data based on LOD was built which fitted the embedded environment well. This model was designed according as the embedded hardware restriction. Based on two aspects of reducing the amount of redundant geo-entities out of display area and speeding up the search efficiency of vector data from external memory, several process were done on the data of vector map, including delaminating, blocking and index building. The experiment results of this method indicated that these strategies could improve the displaying speed of vector map in embedded environment well.

关 键 词：嵌入式GIS 地图显示 LOD 空间索引 

分 类 号：P208[天文地球—地图制图学与地理信息工程] TP368.1[天文地球—测绘科学与技术]