Data organization and management based on PDA

This paper makes a research on the application of GIS system to intelligent terminal PDA and its capability and storage mechanism. It studies how to organize and manage the massive regular grid data of GIS real-timely and visually while the storage capability and speed is so limited. On organization of grid data, it puts forward a data management model that combined pyramid model with one-to-four Quad-tree index; and, about data dynamic display, it introduces hierarchical dynamic simplify method(HDS) to reduce the amount of data in different resolutions and further improve the efficiency of visual interaction in PDA. In this way, we give a solution for the mobile GIS which developed by Embedded Visual Basic based on the integration of GPS/GIS, then we implement this system in fire-control GIS.