利用SPOT和ETM+影像进行县级土地利用调查--以河北省万全县为例
이용SPOT화ETM+영상진행현급토지이용조사--이하북성만전현위례
APPLYING THE IMAGE OF SPOT AND ETM+ TO THE INVESTIGATION OF LAND USING AT COUNTY-LEVEL--Taking Wanquan County of Hebei Province as an Example
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