The soil erosion potential possibility can be studied using the soil background map and digital terrain map supported by GIS;
在GIS支持下，利用土壤背景和数字地形模型可实现水土流失潜在可能性分析。
The methods to obtain the Digital Terrain Model (DTM) from contour map by scan digitizing were studied.
本文还研究了通过扫描数字化等高线图建立数字地形模型的方法。
The principle of loading of digital map in the terrain auxiliary navigation is studied. It is concluded that FDN plays an auxiliary role in the process of loading of digital map.
研究了地形辅助导航中数字地图的加载原理及飞行力学导航法在数字地图加载过程中的辅助作用。
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