| Abstrakt: |
Tile map data is an important data type in the embedded geographic information system, but the resources of calculation, storage and display are very limited in embedded environment. How to organize, storage and index the global tile map data, that is an important problem to be solved in embedded geographic information system. Based on the analysis of the constraint conditions, a resource constraints variable set and a demand variable set of global tile data organization are defined. Then, a restrictive relation model of tile map data is constructed based on embedded environment, and an organization model for global tile map data is further proposed. At same time, a storage model of tile map data is designed, and a two-dimensional linear coding method is introduced to realize quick query. The experiments show that the data organization model is well adapted to embedded environment especially regarding both efficiency and effect for tile maps. [ABSTRACT FROM AUTHOR] |
