一种基于服务器场的分布式WebGIS计算模型设计与实现  

Design and Implementation of Distributed WebGIS Model Based on Server Farm

作　　者：郭明强[1,2] 黄颖[1,2] 谢忠[1,2] 

机构地区：[1]中国地质大学信息工程学院,湖北武汉430074 [2]教育部GIS软件与应用工程研究中心,湖北武汉430074

出　　处：《地理与地理信息科学》2008年第6期12-17,共6页Geography and Geo-Information Science

基　　金：国家863地球观测与导航技术领域专题资助项目(06AA12Z218);国家自然科学基金项目(40771165)

摘　　要：分析传统网络地理信息系统(WebGIS)体系的弊端,从负载均衡与地图状态同步的角度提出一种基于服务器场的分布式WebGIS计算模型。通过自定义服务器场底层交互协议、地图服务器场分布式动态均衡调度算法、地图状态对象池技术,解决了传统WebGIS计算模型异构兼容性差、并行处理能力弱、地图状态对象无法同步等问题,并建立试验床对该模型的性能进行验证。In this paper, the deficiencies of traditional WebGIS model was analyzed in detail such as inefficient heterogeneous compatibility, difficulties in asynchronous operating status and weak parallel processing capability. From the view of load--balan- cing and map status synchronization, a new distributed model based on server farm was proposed. The architecture of the new model was given. The new model added distributed dynamic scheduling model of map server farm, map status objects pool on the basis of tradi- tional WebGIS model. Three core techniques： the user--defined protocol, dynamic load--balancing algorithm of map server farm, and map status objects synchronization mechanism were proposed. By these techniques, the new model can solve those deficiencies in the traditional system abov, At last, a test--bed was established to verify the performance of the model.

关 键 词：网络地理信息系统 服务器场 负载均衡 状态同步 异构 

分 类 号：P208[天文地球—地图制图学与地理信息工程]