由于黄土高原地区地形复杂，在坡耕地遥感调查中单纯采用监督分类法很难获得理想的精度。
The classification accuracy is unsatisfactory in the complicated terrain area of the Loess Plateau when the single supervised classification is used in the remote sensing investigation of slope field.
本文着重介绍在遥感影象分类中应用数字地面模型（DTM）改正地物反射光谱中地形影响的方法和试验。
In this paper the methods and experiments for applying the digital terrain model(DTM) to improve the classification accuracy are introduced.
地形决定了地面电磁波反射的强弱，反射的强弱又决定了被动遥感影像的质量。
The quantity of the EM energy that reflected from the ground decided the quality of the satellite image of passive remote sensing.
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