A new real-time downloading and distributed mobile GIS model based on mobile agent

A new method of real-time downloading and distributed computing model is studied based on mobile geographic information system (GIS) environment. Key technologies are presented in the model, including mobile agent (MA) mobile computing, mobile GIS, global positioning system (GPS), least path computing model, and spatial information distributed grid computing and management model. In order to deal with the narrow bandwidth and instability of the wireless internet, distributed computing of tremendous spatial information, real-time request for spatial information based on limited processing speed and low memory of mobile devices, a new mobile agent based real-time downloading and distributed mobile GIS model (RDMG) is further proposed that has high processing efficiency, less network communication, good load balance and thus suitable for mobile real-time spatial information downloading and distributed computing. Real-time downloading of spatial information and distributed computing realized in the model. The theories and technologies architecture of RDMG are built originally from the base, including the mobile Geo-MA model, mobile GIS client model, mobile agent server model, and distributed GIS server model. An application system for RDMG 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 and distributed computing of spatial information based on mobile GIS environment.