...球地面目标的精确监控，实现高距离分辨率地面动目标检测（HRR-GMTI）、合成孔径雷达成像和获得高分辨率数字地形高程数据（DTED）的能力[3]。 最初，Discoverer II计划包含24颗近地轨道卫星，入射角约为54度，组成Walker星座，轨道高度为770km。
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本文主要对大规模地形数据(基于规则格网数字高程模型)的组织与可视化进行研究。
In this paper, study on organization and visualization of the massive terrain dataset mainly on Regular Square Grid data format are discussed.
高精度数字高程模型(DEM)是水土流失规律研究与流域地形空间分析中重要的空间数据。
High accuracy DEMs is an important data in study of soil erosion and terrain feature space analysis.
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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