【摘要】 在小比例尺自动化制图中,河流是按锲线表示,上游细下游粗。在水网(河网)地区,单幅图中上下游符号粗细不能产生矛盾,同时,不同图幅接边时其符号粗细也不能矛盾,以达到水网符号表达美观清晰等制图质量要求。对水网符号粗细分布的合理配置就是针对这些问题的。本文基于最小二乘法原理,以上游河段的最粗不能大于下游河段的最细为原则,构造了最小二乘模型,通过水网计算实例,说明了该方法结果稳定,能得到最优解,河网符号整体效果好,为解决水网符号粗细分布的合理配置提供了一种有效途径。更多还原

【Abstract】 In automatic cartography of small scale map,the symbol of river take the shape of wedge,in which the upper river is thin and the lower river is thick.For hydrographic network area or network of waterways,the contradiction of thickness of stream symbols for upstream and downstream on a map or among adjacent maps is not allowed.In this paper,based on the condition that the thickest thickness of the upper river symbol should not exceed the thinnest thickness of the lower river symbol,a least squares method is proposed for automatically distributing thickness of stream symbols.Applying this method to a real example of hydrographic network mapping,it shows that the presentation of the symbols of hydrographic network on map is good and the result is stable.This paper presents a feasible method for reasonable distributing thickness of hydrographic symbols on map.更多还原