海图特殊水深的定量识别分析方法

A M ethod of Quantitative Identification and Analysis for Special Depths on Charts

针对当前海图制图过程中作业人员识别特殊水深效率低下、易发生错漏等缺点,借鉴坡度的概念,定义了图示坡度及其计算方法;通过分析海图水深大小与其之间间隔距离的关系,借鉴当前海道测量学中对特殊深度的分级标准,对特殊水深的判断及分级标准设计了明确的量化分级指标,提出了一种海图特殊水深的定量识别分析方法。实验结果表明:所提方法能准确识别特殊水深;作业效率明显高于当前普遍使用的手工识别方法;将特殊水深分为强、中、弱三个等级,可为以后给不同等级的特殊水深设计有区别的海图符号提供参考依据。

While identifying special depths on charts,the hydrographic operators are easy to make mistakes and lack of effectiveness.To solve these problems,this article learns from the concept of slope and defines slope in charts w ith its calculation method.Via analyzing the relationship betw een depths and their distances,this method also designs specific quantitative classification indexes for special depths’ judgment and grading referring to the description of special depths from Hydrographic Survey. Experimental results show :( 1) This method can accurately identify special depths.( 2) The method efficiency is significantly higher than the current commonly used manual identification method.( 3) This method divides special depths into strong,medium and w eak grades,w hich can be used to provide reference for distinguishing chart symbols for different levels of special depths.