The design and development of the topographic data extraction information system based on non-metric digital imagery.
基于非量测数码影像的地形数据采集信息系统设计与开发。
In reality, in order to get more convenient data organization for drawing, LOD model is to use theory of algorithms to reform intrinsic grid topographic data base.
所谓的LOD建模，其实质就是采用一定的算法思想将原有的网格地形数据进行重组，得到一种更加便于实时绘制使用的数据结构。
As the generalization of topographic data, thematic data generalization needs the support of generalization knowledge to satisfy the use requirements and reflect the main geographic nature.
与地形数据综合一样，专题数据综合需要依据一定的综合规则来保障数据综合围绕应用的需求、反映主要地理特征。
Nowadays the most common used methods for extracting small range topographic data are the total-station-based ground surveying and the photography-theodolite-based terrestrial photogrammetry.
目前常用的小范围地形数据采集方法主要有基于全站仪的地面测量方法和基于摄影经纬仪的地面摄影测量方法。
Topographic data are critical to global changes in climate, land formations, atmospheric changes, and research in soil and water loss.
地形数据对于我们了解全球气候变化、土地构成、大气变化，开展区域水土流失研究非常重要。
Topographic data are critical to global changes in climate, land formations, atmospheric changes, and research in soil and water loss.
地形数据对于我们了解全球气候变化、土地构成、大气变化，开展区域水土流失研究非常重要。
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