基于移动GIS的林区矢量数据快速可视化技术  

Rapid visualization technology of forest area vectordata based on mobile GIS

作　　者：刘斌彬[1] 陈飞翔[1] 刘佳星[1] LIU Binbin;CHEN Feixiang;LIU Jiaxing(School of Information Science and Technology,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学信息学院,北京100083

出　　处：《西北大学学报（自然科学版）》2020年第2期295-303,共9页Journal of Northwest University（Natural Science Edition）

基　　金：中央高校基本科研业务费专项资金资助项目(TD2014-02)。

摘　　要：为解决传统移动GIS在林区矢量数据可视化过程中数据请求效率低、内存资源占用高的问题,该文提出了一种适用于林区矢量数据的快速可视化策略。该策略在分析林分空间分布和外业调查人员的操作特征的基础上,采用林区多分辨率矢量瓦片数据,在移动端建立瓦片缓存策略,利用瓦片索引和要素索引,构建矢量瓦片热度指标,同时引入瓦片生命周期因素,最终实现缓存中瓦片置换。以云南省勐海县林业数据为例,利用多种可视化方法对比该文提出的矢量数据的可视化性能。实验结果表明,与传统矢量数据可视化策略相比,该文提出的策略数据请求效率高、内存资源占用少,为移动GIS中林业矢量数据的快速可视化提供了新的解决思路。The traditional method of mobile GIS,in the process of forest area vector data visualization,had the defect of low efficiency and high memory resource usage.To overcome this defect,a fast visualization strategy was proposed.The strategy was based on the analysis of the distribution characteristics of forest structures and the operational characteristics of investigators,using forest multi-resolution vector tile data and establishing a tile caching strategy on the mobile GIS.The strategy used the tile and feature indexes and defined the vector tile heat concept.The strategy combined the tile life cycle indicator,then finished the replacement strategy of the vector tile.Taking the forestry data of Menghai County of Yunnan Province as an example,the performance of the visualization strategy proposed is compared with other traditional visualization methods.Experiments showed that the strategy in this paper had higher efficiency of data request and less memory resource utilization,which provided a new solution for the rapid visualization of forestry vector data in mobile GIS.

关 键 词：移动GIS 林区矢量数据 矢量瓦片 缓存策略 快速可视化 

分 类 号：P208[天文地球—地图制图学与地理信息工程]