Cloud Design And Implementation Of "China Permaforst Engineering And Environmental Monitoring Network"

With the implementation of the major permafrost projects such as Qinghai-Tibet Railway,Harbin-Qiqihaer High-speed Railway and Sichuan-Tibet Railway,etc.,and based on the in-depth study toward the environmental ecology in the cold region,a large number of permafrost monitoring projects have been launched.Because the permafrost temperature is quite a slow changing process,it needs to be monitored for a long time.At the same time,the related monitoring shall be analyzed upon integration with geological conditions and meteorological data,etc.,information.Therefoe,the traditional independent and“isolated island" style method could not meet current and long-term monitoring requirements.The issue is solved by the the Permafrost Construction and Environmental Monitoring Network in China,which constructed jointly by the state key laboratory of Permafrost Construction of the Chinese Academy of Sciences and Xi’an Technological University.The reaearch content of this paper is part of the project."China Permafrost Engineering and Environmental Monitoring Network"transform the original isolated chimney structure,and the monitoring data of different permafrost projects are stored at the cloud,meanwhile according to user’s information query requests download relevant data from the cloud present to users.Unified data management of cloud and the access can greatly reduce the construction cost of permafrost monitoring projects,which provide prerequisite for long-term storage and full utilization of monitoring data.The thesis designed and developed the application layer of "China Permafrost Engineering and Environmental Monitoring Network"according to user’s information query requirement and cloud information storage structure.The main contributions are as follows:(1)Based on the analysis of current users query requests and relevant informat--ion storage status,the paper design a hierarchical access architecture including message presentation layer,business service layer,data interface layer,data resource layer and infrastructure layer,heterogeneous and decentralized data information in different monitoring projects is demonstrated through a unified access interface.The design of Web interface,loading and displaying of data in the interface and jumping mode between interfaces of "China Permafrost Engineering and Environmental Monitoring Network" is completed,which provides users with a good data information exchange interface and simplifies the way that different monitoring project groups obtain data information from the cloud.(2)In order to provide a unified access port and improve accessible ability and security,the paper adopt Ajax technology to guide different access demand with different PHP services and obtain relevant information from different databases through different WebService interfaces.This multi-layer jump access not only enables users access to different monitoring data via unified access port,but also the server allocate resources appropriately to achieve access load balance.Based on the secondary development of ThinkPHP framework in the business service layer,the thesis achieved the judgment and processing of requests in the information display layer and the analysis on response data feedback by the data resource layer.Access to the unified data center has been stated in this paper.(3)In view of structural differences and storage decentralization,etc problems,between existing monitoring system and the unified system,the thesis designed unifiled data interface layer protocol or WebService communication request and message formats.In addition,the WebService interface interaction process,data flow interaction process and the function of the web service interface has also been given,which enables a transparency access to and call of the data in the data resource layer by business service layer.A detailed design of the WebService interface has been stated in this paper。Finally,"China Permafrost Engineering and Environmental Monitoring Network" has been tested several times in different browsers.The test results show smooth and stable operations of the data interaction of Permafrost Construction and Environmental Monitoring Network in China."China Permafrost Engineering and Environmental Monitoring Network" is capable of providing relevant cloud services for users and reaches the expectation.