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中国科学院大学学报 ›› 2026, Vol. 43 ›› Issue (4): 531-540.DOI: 10.7523/j.ucas.2024.077

• 电子信息与计算机科学 • 上一篇    下一篇

基于改进FCM算法的SDGSAT-1多光谱影像云掩膜生成方法

葛凯强1,2,3, 刘佳音1,2(), 王峰1,2   

  1. 1.中国科学院空天信息创新研究院,北京 100094
    2.中国科学院空间信息处理与应用系统技术重点实验室,北京 100190
    3.中国科学院大学电子电气与通信工程学院,北京 100049
  • 收稿日期:2024-04-26 修回日期:2024-11-11 发布日期:2024-12-23
  • 通讯作者: 刘佳音
  • 基金资助:
    国家自然科学基金(62171435)

Cloud mask production method based on improved FCM algorithm for SDGSAT-1 multispectral images

Kaiqiang GE1,2,3, Jiayin LIU1,2(), Feng WANG1,2   

  1. 1.Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China
    2.Key Laboratory of Technology in Geo-Spatial Information Processing and Application System,Chinese Academy of Sciences,Beijing 100190,China
    3.School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2024-04-26 Revised:2024-11-11 Published:2024-12-23
  • Contact: Jiayin LIU

摘要:

可持续发展科学卫星1号(SDGSAT-1)是中国科学院于2021年11月5日成功发射升空的首颗地球科学卫星,旨在实现全球可持续发展目标,为人与自然相互作用的研究提供数据支撑。由于可见光对云层穿透性差,大量光学卫星遥感图像不可避免地受到云层干扰。因此,云掩膜生成是光学遥感处理系统中重要的处理步骤。而SDGSAT-1多光谱影像中缺少传统算法所需要的短波红外波段,传统的云掩膜生成算法难以适用。针对这一问题,提出一种基于改进模糊C均值(FCM)算法的云掩膜生成方法,以亮度、NDWI、NDVI和HOT等4个光谱特征作为输入变量,引入马氏距离,以K-means算法的结果作为初始聚类中心,最后执行FCM算法得到云掩膜。使用已公开的SDGSAT-1多光谱影像对该方法的性能进行验证,并与其他方法进行对比,实验结果表明,该方法的总体精度平均值为95.33%,相比其他方法更具优势。

关键词: SDGSAT-1, 多光谱影像, 云掩膜生成, 模糊C均值算法, K-means算法

Abstract:

Sustainable development science satellite-1 (SDGSAT-1) is the first earth science satellite of the Chinese Academy of Sciences. It was successfully launched on November 5, 2021, aiming to achieve the global sustainable development goals and provide data for the study of interaction between humans and nature. Due to the poor penetration of visible light through cloud, many optical satellite remote sensing images are inevitably disturbed by cloud. Therefore, cloud mask production is an important processing step in optical remote sensing processing system. However, SDGSAT-1 multispectral images lack the short-wave infrared band required by the traditional cloud mask production algorithm, so the traditional cloud mask production algorithm is difficult to apply. Therefore, this paper proposes a cloud mask production method for SDGSAT-1 multispectral images based on fuzzy C-means (FCM) algorithm. The method selects the four spectral features of brightness, NDWI, NDVI, and HOT as input features. On this basis, the Mahalanobis distance is introduced, the results of K-means algorithm are used as the initial clustering center, and finally FCM algorithm is executed to obtain the final cloud mask. In the paper, the published SDGSAT-1 multispectral images are used to verify the performance of the proposed method and to compare it with other methods. The experimental results show that the average accuracy of the proposed method is 95.33%, which is higher than those of other methods.

Key words: SDGSAT-1, multispectral images, cloud mask production, FCM algorithm, K-means algorithm

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