Bulletin of Surveying and Mapping ›› 2020, Vol. 0 ›› Issue (2): 49-54.doi: 10.13474/j.cnki.11-2246.2020.0043

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Extraction method of intertidal mangrove by using Sentinel-2 images

XU Fang1,2,3, ZHANG Ying4,5, ZHAI Liang4,5, LIU Jia4,5, GU Xianghui6   

  1. 1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2. National Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, China;
    3. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China;
    4. Chinese Academy of Surveying and Mapping, Beijing 100830, China;
    5. Key Laboratory of Earth Observation and Geospatial Information Science of MENR, Beijing 100830, China;
    6. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
  • Received:2019-09-09 Online:2020-02-25 Published:2020-03-04

Abstract: Mangroves located in intertidal zone may be submerged by sea water at high tide, which makes the traditional vegetation extraction methods are limited at mangrove information extraction. After comparing and analyzing the spectral characteristics of mangroves exposed, mangroves submerged at high tide level and seawater bodies, a method of extracting intertidal Mangroves by using normalized intertidal mangrove index (NIMI) is proposed in this paper. The index is normalized expressions for the composition of a red band strongly absorbed by vegetation and two red-edge bands as well as a near-infrared band strongly reflected by vegetation. The index is used to classify and extract mangroves from Jiulongjiang Estuary wetland in Longhai, Fujian Province. The results are compared with the results of visual verification of GF-2 and field investigation. The results shows that the user accuracy of this method reaches 93.98%, and is significantly better than that of using normalized water index (NDWI), normalized vegetation index (NDVI) and the results of random forest.

Key words: mangrove, submerge, extraction, Sentinel-2 image, normalized intertidal mangrove index

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