极地研究2025，Vol.37Issue(1)：39-54,16.DOI:10.13679/j.jdyj.20230022
基于MODIS影像的北极冰水分类方法对比研究
Comparative study of five methods for Arctic sea ice and water classification based on MODIS images
摘要
Abstract
Arctic sea ice is an important component of the cryosphere and it has substantial impact on global cli-mate change.Ice water classification is used to obtain detailed information on sea ice coverage changes and ice conditions critical for maritime navigation.In this study,five methods(i.e.,the dynamic thresholding method using histogram(DTM),iterative thresholding method(ITM),maximum entropy thresholding method(MTM),OTSU's method(OM),and genetic algorithm based on OTSU's method(GAM))were used to classify Arctic sea ice and water in 25 near-infrared MODIS images.Quantitative comparison and evalua-tion revealed that for images with a bimodal reflectance histogram(i.e.,no thin ice in the image),all five methods obtained accurate ice water classification results,with overall accuracy(OA)of>0.82.However,when the reflectance histogram had a trimodal distribution(i.e.,with thin ice in the image),the ITM,MTM,and the OM all exhibited misclassification problems,with OA of<0.76,whereas the DTM and GAM accu-rately obtained ice water classification thresholds,with OA of up to 0.94.Generally,the ITM and MTM both tend to overestimate the threshold for the ice water classification,especially for images with a trimodal dis-tribution in the reflectance histogram.The OM can broadly identify the minimum for the threshold but with nonnegligible biases.The DTM and GAM have strong robustness as threshold-based ice water classification methods and are best suited for ice water classification under different ice conditions in the Arctic region.The results represent an important reference for polar navigation and for large-scale sea ice observation and data simulation.关键词
光学影像/冰水分类/近红外波段/直方图动态阈值法/基于大津法的遗传算法Key words
optical image/ice water classification/near-infrared/the dynamic thresholding method using histogram/the genetic algorithm based on OTSU's method引用本文复制引用
孙绍哲,邝慧妍,叶玉芳,于志同,惠凤鸣..基于MODIS影像的北极冰水分类方法对比研究[J].极地研究,2025,37(1):39-54,16.基金项目
国家自然科学基金青年项目(42106225)、广东省自然科学基金面上项目(2022A1515011545)、南方海洋科学与工程广东省实验室(珠海)创新团队建设项目(311021008)、风云卫星应用先行计划项目(FY-APP-2022.0201)和五院CAST创新基金资助 （42106225）
