基于云计算的WebGIS关键技术研究
发布时间：2018-08-12 09:40
【摘要】：近几年来，云计算得到越来越多的研究机构和IT厂商的关注，从最初的概念炒作到逐渐被大家接受，并在一些重点行业开始具体的实践，其发展越来越快，影响范围越来越广。Web地理信息系统（WebGIS）的计算和数据密集型特点使其成为云计算技术的理想应用领域。云计算在海量存储、并行计算、负载均衡、错误恢复等方面的优秀表现，，将有望进一步提高WebGIS的性能。 本论文来源于实际的科研项目，主要目标是以开源云计算解决方案Hadoop为基础，设计并实现基于云计算的WebGIS原型系统，验证海量地图数据云存储方案的可行性，探索基于Web的平面/球体地图展示技术，测试相关性能参数。论文所做的主要工作概括如下： (1)设计并实现了一个基于Hadoop的WebGIS原型系统。该系统服务器端采用了Tomcat+JSP技术，海量地图瓦片数据存储在HBase中；系统采用了基于递归4叉树的存储模型，提高了连续存储记录的空间临近性，有效降低了地图瓦片的实时读取延时； (2)利用JavaScript技术实现了基于Web浏览器的平面地图展示功能； (3)研究了球体地图的实现原理，并给出了基于Flash Away3D库和基于WorldWind框架的两种在浏览器中展示球体地图的编程方案； (4)在实验室环境下对系统的相关性能进行了测试：主要测试了结点规模、备份数、HBase缓存、瓦片的索引方式对集群性能的影响。
[Abstract]:In recent years, cloud computing has received more and more attention from research institutions and IT manufacturers, from the initial concept speculation to gradually accepted, and in some key industries began to practice, its development is getting faster and faster. Web Geographic Information system (WebGIS) is becoming an ideal application field of cloud computing technology due to its computing and data-intensive characteristics. Cloud computing in mass storage, parallel computing, load balancing, error recovery and other aspects of outstanding performance, will be expected to further improve the performance of WebGIS. The main goal of this thesis is to design and implement a cloud-based WebGIS prototype system based on open source cloud computing solution (Hadoop) to verify the feasibility of cloud storage scheme for mass map data. Explore the plane / sphere map display technology based on Web, test the related performance parameters. The main work of this paper is summarized as follows: (1) A WebGIS prototype system based on Hadoop is designed and implemented. Tomcat JSP technology is used in the server side of the system, the massive map tile data is stored in HBase, the storage model based on recursive quadtree is adopted in the system, and the spatial proximity of continuous storage records is improved. It effectively reduces the real-time reading delay of map tiles; (2) realizes the plane map display function based on Web browser by using JavaScript technology; (3) studies the realization principle of sphere map. Two programming schemes of displaying spherical map in browser based on Flash Away3D library and WorldWind framework are given. (4) the relativity of the system is tested in laboratory environment: the scale of node is tested. Backup number of HBase cache, the impact of tile indexing on the performance of the cluster.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208
本文编号：2178668
[Abstract]:In recent years, cloud computing has received more and more attention from research institutions and IT manufacturers, from the initial concept speculation to gradually accepted, and in some key industries began to practice, its development is getting faster and faster. Web Geographic Information system (WebGIS) is becoming an ideal application field of cloud computing technology due to its computing and data-intensive characteristics. Cloud computing in mass storage, parallel computing, load balancing, error recovery and other aspects of outstanding performance, will be expected to further improve the performance of WebGIS. The main goal of this thesis is to design and implement a cloud-based WebGIS prototype system based on open source cloud computing solution (Hadoop) to verify the feasibility of cloud storage scheme for mass map data. Explore the plane / sphere map display technology based on Web, test the related performance parameters. The main work of this paper is summarized as follows: (1) A WebGIS prototype system based on Hadoop is designed and implemented. Tomcat JSP technology is used in the server side of the system, the massive map tile data is stored in HBase, the storage model based on recursive quadtree is adopted in the system, and the spatial proximity of continuous storage records is improved. It effectively reduces the real-time reading delay of map tiles; (2) realizes the plane map display function based on Web browser by using JavaScript technology; (3) studies the realization principle of sphere map. Two programming schemes of displaying spherical map in browser based on Flash Away3D library and WorldWind framework are given. (4) the relativity of the system is tested in laboratory environment: the scale of node is tested. Backup number of HBase cache, the impact of tile indexing on the performance of the cluster.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208
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