【摘要】：在城市數字化的建設過程中，GIS的應用日趨廣泛，尤其是WebGIS在電子商務、電子政務、軍警等領域的信息系統應用越來越廣泛，同時，隨著計算機軟硬件的迅速發(fā)展，電子移動終端不斷涌現，通信技術的發(fā)展、3G等業(yè)務的普及，信息交流共享移動化趨勢逐步增大，使得移動GIS的應用越來越普及。在應用的過程中，GML數據格式的出現解決了由于不同廠商數據格式的不同帶來數據的共享、交換的問題，但同時由于GML格式數據的數量巨大、采用明文傳輸等特點，在現有無線網速較低、安全性較差的情況下，如何提高數據交換的效率、如何在浩瀚的數據中保證數據的安全性成為當前移動GIS環(huán)境中GML數據應用需要研究的關鍵問題，同時，如何在終端上進行部署成為應用中的又一關鍵問題。 為了達到提高數據在移動環(huán)境下的交換效率，本文在通用壓縮算法的基礎上，針對GML數據的特點，，通過解析，使得結構和空間數據分離，并分別采用標簽壓縮和增量壓縮的方法，使得數據的壓縮率得到極大的提升，有效的降低了數據體積。 為了保證商業(yè)等方面的數據在移動環(huán)境下的安全，對數據進行加密等安全方面的研究。在數據的加密上，不再依賴于傳統的無線鏈路安全機制。借鑒XML的安全標準，根據GML數據的特點，編寫了基于元素和元素內容的加密算法，使得巨大的GML數據加密成為可能，并對對稱加密和非對稱加密在GML元素加密中的實現進行了研究。 在.NET的環(huán)境下，使用C#語言完成了針對前面研究結果的原型系統的搭建，并在不同的終端條件下進行了一定的測試與分析。針對在不同終端中的應用問題，從平臺的搭建和軟件的部署等方面探討了在應用中各種問題并給出合適的解決方法。
[Abstract]:In the process of urban digitization, the application of GIS is becoming more and more extensive, especially the application of WebGIS in e-commerce, e-government, military and police and other fields. At the same time, with the rapid development of computer software and hardware, With the continuous emergence of electronic mobile terminals, the development of communication technology, the popularity of 3G and other services, the mobile trend of information exchange and sharing is gradually increasing, which makes the application of mobile GIS more and more popular. In the process of application, the emergence of GML data format solves the problem of data sharing and exchange due to the different data formats of different manufacturers, but at the same time, because of the huge amount of GML format data, it adopts clear text transmission and so on. In the case of low speed and poor security of the existing wireless network, how to improve the efficiency of data exchange and how to ensure the security of data in the vast data has become the key problem to be studied in the current mobile GIS environment. At the same time, how to improve the efficiency of data exchange and how to ensure the security of data in the vast data has become the key problem to be studied in the current mobile GML environment. How to deploy on the terminal has become another key problem in the application. In order to improve the exchange efficiency of data in mobile environment, based on the general compression algorithm, according to the characteristics of GML data, the structure and spatial data are separated by parsing. Label compression and incremental compression are used respectively, so that the compression ratio of the data is greatly improved and the data volume is effectively reduced. In order to ensure the security of commercial data in mobile environment, the security of data encryption is studied. In the encryption of data, it no longer depends on the traditional wireless link security mechanism. Using the security standard of XML for reference, according to the characteristics of GML data, an encryption algorithm based on elements and element content is written, which makes it possible to encrypt huge GML data. The implementation of symmetric encryption and asymmetric encryption in GML element encryption is also studied. In the environment of. Net, the prototype system for the previous research results is built by using C # language, and the prototype system is tested and analyzed under different terminal conditions. Aiming at the application problems in different terminals, this paper probes into various problems in the application from the aspects of the construction of the platform and the deployment of the software, and gives the appropriate solutions.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P208

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