等高线的分类（1）首曲线(intermediate contour)：首曲线也称基 本等高线，是指从高程基准面起算，按规定的基本等高 距描绘的等高线称首曲线。
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矿山测量课件 ... 二．地貌符号——等高线(contour) 基本等高线——首曲线(intermediate contour) 加粗等高线——计曲线(index contour) ...
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Some experiments on a series of data show that this method is feasible to intermediate contour interpolation, and important in three dimension reconstruction and display of medical image data.
对一系列数据的实验结果表明，它是一种可行的层间轮廓线插值方法，对医学影像数据的三维重建和显示具有重要意义。
In the relatively passing intermediate family sedan the gauge medium-range contour design says, MG6 will appear has in the future the feeling and the technical feeling.
相对过往的中级家轿中规中距的外形设计而言，MG 6显得更具未来感和科技感。
Now the main navigation means of such vehicles still adopts inertial navigation, and intermediate navigation adopts terrain contour matching method.
该类飞行器目前仍采用惯性导航为主要的导航手段，中制导采用地形匹配。
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