This paper discusses the methods of automatic extraction of digital elevation model (DEM) from remote sensing image. A system of scheme is established to extract DEM from SPOT image.
本文研究了利用航天遥感影像自动提取数字高程模型（DEM）的方法技术，建立了一整套利用SPOT影像提取DEM的方案。
Having experienced the ways of field survey on the spot and eyed-interpret on image, the survey technique on soil erosion entered a new stage of using digital remote sensing imagery.
土壤侵蚀调查技术经历了人工实地填图调查、航(卫)片目视判读调查之后，目前已进入数字遥感影像调查的新阶段。
Having experienced the ways of field survey on the spot and eyed-interpretation on optical image, the survey technique on soil erosion entered a new stage of using digital remote sensing imagery.
土壤侵蚀调查技术经历了人工实地填图调查、航(卫)片目视判读调查之后，目前已进入数字遥感影像调查的新阶段。
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