Gprs J2me Mobile Geographic Information System Mgis

This article is related with one actual project-Mobile Geographic Information System. The project is supported by government capital, designed and developed by the author's company. The goal of this project is to let anybody who has the mobile phone in hand could access e-map information at anytime and anywhere. The purpose is that, through executing this project, apply the learned knowledge in university to the new areas: mobile telecom and embedded technology, and solve some actual technical problems. It applies the following methods and technology: Software Engineering, OOP (Object Oriented Programming), Multi-thread Programming, J2ME (Java 2 Micro Edition), UML, Client/Server architecture, MVC structure, Multi Communication Protocol Programming etc. Finally the work basically realizes the design goal, completes the first phase's task - basic functions are almost ready, and can be used for internal purpose. Now more improvements are made to it, hope to release to common users soon. The difficulty of this project is how to transplant GIS application in such a limited mobile environment - low-band transmit speed, limited resource for development. The core element of usability is speed, including user operation's speed, e-map display's speed, data download's speed, information query and calculation's speed etc. Focus on it, we utilize quite a number of solutions, such as the work in the system archietecture, data structure, communication protocol, multi-thread etc. Through our improvements and optimization, the result is good enough for users to use our application. The conclusion of this article is: mobile application is not an easy work which is just to transplant PC and internet's application to mobile environment. It is a big challenge to do development based on current mobile environment, we have to do special work to optimize and improve. In the future, we will continue to make the application better, add more features to it, make it more portable to other mobile platforms, and produce packages based on this project's modules.