A new method of distributed mobile GIS grid model based on mobile agent

A new methodology of distributed mobile geographic information system (GIS) grid model is studied based on mobile agent and grid computing environment. Key technologies are presented in the model, including mobile agent (MA) distributed computing, grid computing, mobile GIS, global positioning system (GPS), transfer control protocol/internet protocol (TCP/IP), and user datagram protocol (UDP). In order to deal with the narrow bandwidth and instability of the wireless internet, distributed organization of tremendous spatial information, limited processing speed and low memory of mobile devices, a new distributed mobile GIS grid model (DMGG) based on mobile agent is further proposed that has good load balance, high processing efficiency, less network communication and thus suitable for distributed mobile GIS environment. Real-time downloading of spatial information and distributed computing realized in the model. The theories and technologies architecture of DMGG are built originally from the base, including spatial information mobile agent model, distributed mobile GIS grid sever model, mobile agent server model and mobile GIS client model. An application system for DMGG is therefore developed authorship by visual c++ and embedded visual c++. A field test is carried out through this system in Shanghai, and the results show that the proposed model and methods are feasible and adaptable for real-time downloading of spatial information and distributed grid computing in mobile GIS environment.