嵌入式环境下全球尺度瓦片地图数据组织与索引机制

Organization and Indexing Mechanism for Global Tile Map Data Under Embedded Environment

针对移动地理计算需求,构建了嵌入式环境下瓦片数据组织的约束关系模型,提出了一种基于全球框架的瓦片数据组织模型,设计了海量瓦片的物理存储模型,采用二维线性编码方案,实现了对瓦片数据的快速检索。在工程实践中对该模型进行检验,应用表明该瓦片数据组织模型在效率和效果方面都体现了对嵌入式环境较好的适应性。

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.