引用本文: 张立华, 温连发, 贾帅东. 航海图等深线化简质量的定量评估指标与方法[J]. 武汉大学学报 ( 信息科学版), 2018, 43(4): 496-501, 508.
ZHANG Lihua, WEN Lianfa, JIA Shuaidong. Indices and Methods for Evaluating Quantificationally the Quality of Simplification of a Depth-Contour in Nautical Chart[J]. Geomatics and Information Science of Wuhan University, 2018, 43(4): 496-501, 508.
 Citation: ZHANG Lihua, WEN Lianfa, JIA Shuaidong. Indices and Methods for Evaluating Quantificationally the Quality of Simplification of a Depth-Contour in Nautical Chart[J]. Geomatics and Information Science of Wuhan University, 2018, 43(4): 496-501, 508.

## Indices and Methods for Evaluating Quantificationally the Quality of Simplification of a Depth-Contour in Nautical Chart

• 摘要: 针对当前对航海图等深线化简的质量评估仅能靠经验定性分析、无法进行定量评估这一局限，从航海安全性、航行资源表达和平滑性准则出发，分别定义了扩深长度、平均扩深距离、缩深面积、等深线的弯曲度与光滑离差等质量评估指标，提出了相应的评估方法，并推导出了相关的计算公式。实验结果表明，定义的指标能分别从航海安全性、航行资源表达和平滑性3个方面较为明确合理地反映航海图等深线化简的质量；所提评估方法能定量评估等深线化简的质量，克服了传统经验方法只能定性分析的不足。

Abstract: To address the limitation that the quality of simplification of a depth-contour in nautical chart can only be analyzed qualitatively, not quantificationally, these indices including the contour length of extending deep area, the mean distance of extending deep area, the reducing deep area, the curvature and the dispersion to a smoothed curve are defined, respectively from the safety of navigation, the representation of available depth space and the smoothness, the corresponding evaluating methods are proposed, and the indispensable formulas are concluded. The experimental results demonstrate:(1) the defined indices can effectively and reasonably estimate the quality of simplification of depth-contour in nautical chart from the safety of navigation, the representation of available depth space and the smoothness; (2) the proposed methods can estimate the quality of depth-contour simplification and overcome the shortcoming of the existing methods which can only analyze qualitatively.

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