Seaweed aquaculture is vital in protecting the marine eco-environment and mitigating climate change. China generates more than half of the world’s total seaweed production. However, despite multiple local studies, accurate and reliable information on broad-scale seaweed farms is still scarce. Using an object-based method to classify 3 m spatial resolution Planet Scope images along offshore China, a total of 129,494 ha of cultured seaweed was identified and delineated with an overall accuracy of 95.70% and a KAPPA index of 0.912, respectively. Then, a seaweed map in offshore China in 2018–2019 was developed. The results provided basic information about seaweed farms in China. The approach reported in this work is accurate and efficient, which can be used to replace the conventional method to obtain the culture seaweed information. This study can be of reference for mapping seaweed on a broader or global scale.
Bibliographical noteKAUST Repository Item: Exported on 2023-05-05
Acknowledgements: This research was partially funded by the Ministry of Natural Resources of China ("Remote Sensing Applications of Ocean Satellites", the National Natural Science Foundation of China (42171398), and the Fundamental Research Fund of Zhejiang University (2021XZZX012). We greatly appreciate the Editor and three Reviewers for their thoughtful and constructive comments/suggestions on the early version of this paper. This research was partially funded by the Ministry of Natural Resources (Remote Sensing Applications of Ocean Satellites), the National Natural Science Foundation of China (42171398), and the Fundamental Research Fund of Zhejiang University (2021XZZX012).
ASJC Scopus subject areas
- Water Science and Technology
- Geography, Planning and Development