嵌入式GIS中基于LOD的地图数据组织模型设计

Design of Map Data Model Based on LOD in Embedded GIS

为实现嵌入式GIS中实时地图显示,设计了一种适合嵌入式环境基于LOD的地图数据组织模型。主要是针对嵌入式设备硬件条件限制,在综合考虑屏幕显示尺寸和地图显示比例尺的基础上,对矢量和栅格地图数据进行了LOD分层、压缩、分块和建立索引等一系列处理。该模型已被应用于多个嵌入式GIS中。通过实际应用表明,其能很好地满足嵌入式环境下实时地图显示的要求,可以提高地图显示速度和改善显示效果。

In order to realize the real-time display of map in embedded GIS,a organization model of map data based on LOD was designed which fitted the embedded environment well.This model was designed according as the embedded hardware restriction,the size of screen and the scale of map.Based on these three factors,several processes were done on the vector data and image data,including delaminating,compressing,blocking and index building.The model has been used in several embedded GIS and proved that it can satisfy the requirement of map＇s real-time display in embedded environment,and the display speed and effect has also been improved.