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Technical Note

A Fine-Scale Mangrove Map of China Derived from 2-Meter Resolution Satellite Observations and Field Data

1
Land Satellite Remote Sensing Application Center (LASAC), Beijing 100048, China
2
Beijing Laboratory of Water Resources Security, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
3
LREIS, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Academic Editor: Wolfgang Kainz
ISPRS Int. J. Geo-Inf. 2021, 10(2), 92; https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10020092
Received: 9 December 2020 / Revised: 9 February 2021 / Accepted: 16 February 2021 / Published: 20 February 2021
Mangrove forests are important ecosystems in the coastal intertidal zone, but China’s mangroves have experienced a large reduction in area from the 1950s, and the remaining mangrove forests are exhibiting increased fragmentation. A detailed mangrove dataset of China is crucial for mangrove ecosystem management and protection, but the fragmented mangrove patches are hardly mapped by medium resolution satellite imagery. To overcome these difficulties, we presented a fine-scale mangrove map for 2018 using the 2-meter resolution Gaofen-1 and Ziyuan-3 satellite imagery together with field data. We employed a hybrid method of object-based image analysis (OBIA), interpreter editing, and field surveying for mangrove mapping. The field survey route reached 9500 km, and 2650 patches were verified during the field work. Accuracy assessment by confusion matrix showed that the kappa coefficient reached 0.98, indicating a highly thematic accuracy of the mangrove dataset. Results showed the total area of mangrove forest in China for 2018 was 25,683.88 hectares, and approximately 91% of mangroves were found in the three provinces of Guangdong, Guangxi, and Hainan. About 64% of mangroves were distributed in or near the nature reserves established by national or local governments, which indicated that China’s mangroves were well protected in recent years. The new fine-scale mangrove dataset was freely shared together with this paper, and it can be used by local authorities and research groups for mangrove management and ecological planning. View Full-Text
Keywords: mangrove China; high resolution; remote sensing; Gaofen-1; Ziyuan-3; object-based image analysis mangrove China; high resolution; remote sensing; Gaofen-1; Ziyuan-3; object-based image analysis
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MDPI and ACS Style

Zhang, T.; Hu, S.; He, Y.; You, S.; Yang, X.; Gan, Y.; Liu, A. A Fine-Scale Mangrove Map of China Derived from 2-Meter Resolution Satellite Observations and Field Data. ISPRS Int. J. Geo-Inf. 2021, 10, 92. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10020092

AMA Style

Zhang T, Hu S, He Y, You S, Yang X, Gan Y, Liu A. A Fine-Scale Mangrove Map of China Derived from 2-Meter Resolution Satellite Observations and Field Data. ISPRS International Journal of Geo-Information. 2021; 10(2):92. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10020092

Chicago/Turabian Style

Zhang, Tao, Shanshan Hu, Yun He, Shucheng You, Xiaomei Yang, Yuhang Gan, and Aixia Liu. 2021. "A Fine-Scale Mangrove Map of China Derived from 2-Meter Resolution Satellite Observations and Field Data" ISPRS International Journal of Geo-Information 10, no. 2: 92. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi10020092

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