移动GIS中GML数据压缩、加密及应用关键问题研究

发布时间：2019-05-24 16:43

【摘要】：在城市数字化的建设过程中，GIS的应用日趋广泛，尤其是WebGIS在电子商务、电子政务、军警等领域的信息系统应用越来越广泛，同时，随着计算机软硬件的迅速发展，电子移动终端不断涌现，通信技术的发展、3G等业务的普及，信息交流共享移动化趋势逐步增大，使得移动GIS的应用越来越普及。在应用的过程中，GML数据格式的出现解决了由于不同厂商数据格式的不同带来数据的共享、交换的问题，但同时由于GML格式数据的数量巨大、采用明文传输等特点，在现有无线网速较低、安全性较差的情况下，如何提高数据交换的效率、如何在浩瀚的数据中保证数据的安全性成为当前移动GIS环境中GML数据应用需要研究的关键问题，同时，如何在终端上进行部署成为应用中的又一关键问题。为了达到提高数据在移动环境下的交换效率，本文在通用压缩算法的基础上，针对GML数据的特点，，通过解析，使得结构和空间数据分离，并分别采用标签压缩和增量压缩的方法，使得数据的压缩率得到极大的提升，有效的降低了数据体积。为了保证商业等方面的数据在移动环境下的安全，对数据进行加密等安全方面的研究。在数据的加密上，不再依赖于传统的无线链路安全机制。借鉴XML的安全标准，根据GML数据的特点，编写了基于元素和元素内容的加密算法，使得巨大的GML数据加密成为可能，并对对称加密和非对称加密在GML元素加密中的实现进行了研究。在.NET的环境下，使用C#语言完成了针对前面研究结果的原型系统的搭建，并在不同的终端条件下进行了一定的测试与分析。针对在不同终端中的应用问题，从平台的搭建和软件的部署等方面探讨了在应用中各种问题并给出合适的解决方法。
[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.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208

【参考文献】