isoanomalic contour line 异常等值线
approximate contour line 未精测等高线 ; 近似等高线
basic contour line 基准外形线
marine contour line 海等深线
coastal contour line 海岸地形线
contour line model 等高线模型
N a line on a map or chart joining points of equal height or depth 等高线 (Often shortened to contour)
An isogon is a contour line for a variable which measures direction.
等角线是用于测量方向的变量的轮廓线。
A simplified method was put forward on a binary image contour line extraction.
该文对二值图像轮廓线的提取，提出了一种简捷的算法。
By using the role and the drafting methods, projective contour line of a quadric at random position can be drawn.
利用这一规律和作图方法，可以解决任意位置的非退变二阶曲面的投影轮廓线的作图问题。
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