Mapping high-resolution mangrove forests in China using GF-2 imagery under the tide

  • role: First author第一作者
  • Affiliation:

    School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China

  • Email:xiaqing@csust.edu.cn
  • Introduction:湿E-mailxiaqing@csust.edu.cn
XIA Qing1,  
  • role: Corresponding author通信作者
  • Affiliation:

    School of Hydraulic Engineering, Yunnan Agricultural University, Kunming 650201, China

  • Email:wenniforever@126.com
  • Introduction:E-mailwenniforever@126.com
LI Jianghua2*,  
  • Affiliation:

    School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China

DAI Shuo1,  
  • Affiliation:

    School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China

ZHANG Han1,  
  • Affiliation:

    School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China

XING Xuemin1

ملخص

Remote sensing technology is widely used in mangrove forest mapping with the advantages of real-time mapping, accuracy, multiscalability, and repeatability. Until now, the mangrove forest dataset with the highest spatial resolution in China is produced by 10 m Sentinel data. In addition, most existing mangrove forest datasets in China ignore the influence of tide, leading to low spatial resolution and inaccurate mapping. On the basis of Chinese GF-2 images, this study aims to map Chinese mangrove forests in 2020 with a spatial resolution of 1 m under the tide. Specifically, 312 scenes of GF-2 image covering China's coastline (24 scenes of GF-1 image covers the areas without GF-2 images) were selected. First, the selected images were segmented using the object-based multiscale method, and the submerged mangrove recognition index was used as a tidal influence indicator. Finally, high-resolution mapping of mangrove forests in China was conducted using the random forest classifier. Results show that the mangrove area in China in 2020 was 29,576.48 ha, 95% of which was mainly distributed in the Guangxi, Guangdong, and Hainan Provinces. The overall classification accuracy was 92%, and the Kappa coefficient was 0.89. The mangrove area without tidal influence was 2,531.24 ha less than that with tidal influence. The high-resolution mangrove dataset generated in this study can provide high-precision data support for the monitoring, management, and evaluation of mangrove ecosystems in China, and it is valuable for practical application.

مفهوم

remote sensing;GF-2;Mangrove forests;object-oriented;tide;random forest classifier

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