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等高线有哪些特性?

问答题
2021-07-18 11:43
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正确答案
(1)同一条等高线上的各点高程相等,但高程相等的点,不一定在同一条等高线上。   (2)等高线为连续的闭合曲线,有可能在同一幅图内闭合,也可能穿越若干图幅而闭合。凡不在本幅图闭合的等高线,应绘到图廓线,不能在图内中断,但间曲线和助曲线只在需要的地方绘出。   (3)非特殊地貌,等高线不能重叠和相交,也不能分岔;非河流、房屋或数字注记处,等高线不能中断。  (4)等高线平距与地面坡度成反比。 (5)等高线与山脊线、山谷线成正交。   (6)等高线不能直穿河流,应逐渐折向上游,正交于河岸线,中断后再从彼岸折向下游。

试题解析
(1)同一条等高线上的各点高程相等,但高程相等的点,不一定在同一条等高线上。   (2)等高线为连续的闭合曲线,有可能在同一幅图内闭合,也可能穿越若干图幅而闭合。凡不在本幅图闭合的等高线,应绘到图廓线,不能在图内中断,但间曲线和助曲线只在需要的地方绘出。   (3)非特殊地貌,等高线不能重叠和相交,也不能分岔;非河流、房屋或数字注记处,等高线不能中断。  (4)等高线平距与地面坡度成反比。 (5)等高线与山脊线、山谷线成正交。   (6)等高线不能直穿河流,应逐渐折向上游,正交于河岸线,中断后再从彼岸折向下游。

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