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Extraction of marsh wetland in Heilongjiang Basin based on GEE and multi-source remote sensing data

  • role： First author第一作者
  • Affiliation：

    Institute of Photogrammetry and Remote Sensing, Chinese Academy of Surveying and Mapping, Beijing 100036, China

    College of Geomatics,Shandong University of Science and Technology, Qingdao 266590, China

  • Email：ningxg@casm.ac.cn
  • Introduction：宁晓刚，1979年生， 男， 研究员，研究方向为地理国情和自然资源遥感监测。 E-mail： ningxg@casm.ac.cn
NING Xiaogang12,  
  • Affiliation：

    Institute of Photogrammetry and Remote Sensing, Chinese Academy of Surveying and Mapping, Beijing 100036, China

    College of Geomatics,Shandong University of Science and Technology, Qingdao 266590, China

CHANG Wentao12,  
  • role： Corresponding author通信作者
  • Affiliation：

    Institute of Photogrammetry and Remote Sensing, Chinese Academy of Surveying and Mapping, Beijing 100036, China

    College of Geomatics,Shandong University of Science and Technology, Qingdao 266590, China

  • Email：wanghao@casm.ac.cn
  • Introduction：王浩，1985 年生，男，副研究员，研究方向为生态遥感监测与土地利用变化分析。E-mail： wanghao@casm.ac.cn
WANG Hao12*,  
  • Affiliation：

    Institute of Photogrammetry and Remote Sensing, Chinese Academy of Surveying and Mapping, Beijing 100036, China

ZHANG Hanchao1,  
  • Affiliation：

    State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China

ZHU Qiande3

résumé

Wetland is an important ecosystem on the planet and plays a pivotal role in maintaining global ecological environment security. Traditional wetland monitoring requires a lot of manpower and financial resources due to the unique hydrological characteristics of wetlands, and extracting large-scale wetland information is also difficult. Compared with traditional field surveys, remote sensing technology, which has the advantages of wide observation range, short update cycle, has played an important role in large-scale wetland information extraction. However, remote sensing monitoring of march wetland mainly uses optical images traditionally, which are severely affected by weather such as clouds and rain, making large-scale marsh wetland extraction challenging. The use of radar and terrain data can combine the spectral information and scattering mechanism, which has great potential for marsh wetland information extraction. Nevertheless, there are few studies that evaluate the differences of optical, SAR, and topographic features in importance for the extraction of marsh wetland information. The rise of big data and cloud computing has enabled large-scale and long time series spatial data processing. On the basis of the Google Earth Engine (GEE) cloud platform, this study uses Sentinel-1 synthetic aperture radar data, Sentinel-2 optical data, and terrain data to explore their importance to the extraction of marsh wetland at large scale, and verify the feasibility of JM distance to find the optimal feature combination to the extraction of marsh wetland. Random forest algorithm is also used to extract marsh wetlands in Heilongjiang Basin in 2018. In order to explore the importance of red edge, radar and topographic features and the best features conducive to marsh wetland extraction, six experimental schemes are designed. Scheme one uses the combination of spectral feature, vegetation index and water index. Scheme two uses the combination of spectral feature and red edge feature. Scheme three uses the combination of spectral feature and terrain feature. Scheme four uses the combination of spectral feature and radar feature. Scheme five uses the combination of spectral feature, vegetation index, water index, red edge feature, terrain feature and radar feature. Scheme six uses all features, which are optimized by JM distance. The research shows that (1) Sentinel-2 red edge bands and Sentinel-1 radar bands and terrain data are conducive to marsh wetland information extraction. Compared with vegetation indexes and water indexes, the producer accuracy of marsh increased by 7.56%, 5.04%, and 4.48%. (2) The separation obtained using JM distance shows that the order is red-edge features > other optical features > terrain features > radar features. The marsh wetland in scheme six has the highest mapping accuracy and user accuracy. After using the JM distance to select features, the producer and user accuracies of the marsh wetland increased by 1.45% and 3.02%, respectively. The overall accuracy of the combined random forest algorithm was 91.54%, and the accuracy of marsh extraction was 88%. This study uses the GEE cloud platform, multisource remote sensing data, and machine learning algorithms to accurately, quickly, and efficiently extract large-scale marsh wetland information. This method has great application potential.

mots-clés

remote sensing;Google Earth Engine;marsh;Sentinel-1;Sentinel-2;JM distance;Random Forest;red-edge bands

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