Mobile GIS In GML Data Compression, Encryption And Application Of Key Research Issues

City digitization process of building the increasingly widespread application of GIS,especially WebGIS more and more extensive application of information systems in the field ofe-commerce, e-government, military and police, at the same time, with the rapid development ofcomputer hardware and software, electronic mobilethe terminal constantly emerging, thepopularity of the development of communication technology,3G business, information exchangeand sharing mobile trend gradually increase, mobile GIS applications is becoming increasinglypopular. GML data format in the application process, appear to solve the problems brought due todifferent manufacturers data format different data sharing, exchange, but at the same time due tothe huge amount of data in GML format, transmitted in the clear characteristics in existingunlimited network low speed and poor security situation, how to improve the efficiency of dataexchange, and how to GML data applications in mobile GIS environments need to study the keyissues to ensure the security of the data in the vastness of the data, at the same time, how in theterminal on deploying applications is another key issue.To improve data exchange efficiency in the mobile environment, in the generic compressionalgorithm, based on the characteristics of GML data by parsing, so that separation of structureand spatial data and respectively tag compression and incremental compression method, such thatbe greatly improved data compression rate, reduce the data volume.In order to guarantee the security of the business and other aspects of the data in the mobileenvironment, data encryption and other security research. Data encryption, no longer relies on thetraditional wireless link security mechanism. Learn XML security standards, according to thecharacteristics of GML data, write it possible encryption algorithm based on elements andelement content, making huge GML data encryption, symmetric encryption and asymmetricencryption to achieve in the the GML elements of encryption.In the.NET environment using C#language to complete a prototype system for the front ofthe findings of the structures, and a certain amount of testing and analysis of different terminalconditions. Explore appropriate solutions in the application of a variety of issues and givendifferent terminal from the platform to build and software deployment.