这两个模块的结合，实现了遥感影像、矢量地图、数字高程模型以及三维场景数据的统一管理和调度。
All of these two modules achieve unified management and scheduling about remote sensing images, vector maps, digital elevation models and three-dimensional scene data.
最后分析了数字地图的高程精度对定位精度的影响。
At last, the influence of digital map's height accuracy was analyzed.
数据库包括地图数据、遥感影像数据、文档数据、照片数据、数字高程模型以及各类数据的元数据信息。
The remote sensing datum, map datum, photo datum, document datum, DEM, and meta-data are included in the database.
分析了DMA的DTED和USGS的DEM高程数据存储格式，比较了其异同，提出了一种高效的数字地图高程数据的存储格式并实现了存取算法。
Analyzing the storage format of DMA DTED and USGS DEM and then presenting a new digital terrain elevation data storage format. The storing and reading algorithm are also realized.
针对由数字地图等以均匀网格形式给出的高程数据生成真实三维地形的仿真需求，提出了一种基于加权外推算法的地形几何模型。
For the requirements of creating 3d terrain based on the elevation data which is in the form of regular grid, a kind of modeling method based on weighted average algorithm is proposed.
针对由数字地图等以均匀网格形式给出的高程数据生成真实三维地形的仿真需求，提出了一种基于加权外推算法的地形几何模型。
For the requirements of creating 3d terrain based on the elevation data which is in the form of regular grid, a kind of modeling method based on weighted average algorithm is proposed.
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