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-interpret on image, the survey technique on soil erosion entered a new stage of using digital remote sensing imagery.
森林资源现状调查主要应用TM卫星影像图进行目视判读。
The main method of forest resource situation investigation is the visual judgement method for images from TM satellite.
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.
即通过卫星影像的处理、判读，辅以GPS地面定位调查及其它调查方法获得中国北方沙化土地基础数据；
That is, acquiring basic data by processing and interpreting the satellite image, assisted by ground investigation using GPS and other investigation method;
即通过卫星影像的处理、判读，辅以GPS地面定位调查及其它调查方法获得中国北方沙化土地基础数据；
That is, acquiring basic data by processing and interpreting the satellite image, assisted by ground investigation using GPS and other investigation method;
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