动态按需加载算法在GIS地图中的应用

Application of Dynamic On-demand Loading Algorithm in GIS Map

针对传统数据加载算法存在数据冗余多、加载慢的问题,从地图显示技术现状与用户需求出发,提出动态按需加载算法,通过对图形元素进行分块与建立分块索引实现地理信息系统地图数据的快速查询、加载、显示。测试及分析结果表明,该算法很大程度上减少了系统加载数据量和数据冗余,提高了数据加载速率。

Aiming at the problem of much data redundancy,slow data loading of traditional data loading algorithm,according to status of map showing technology and user need,this paper presents a dynamic on-demand loading algorithm.It blocks graphic element and establishes sub-block index to achieve rapid querying,loading and showing.Test and analysis results show that the algorithm reduces amount of loading data and data redundancy to a large extent,and improves the data loading rate.