JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (2): 213-220.doi: 10.12302/j.issn.1000-2006.202101013

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Developing remote sensing based methods for land cover change detection in national parks from GEE platform: a case study from the Qianjiangyuan National Park pilot area

MAO Lijun1,2(), LI Haitao3, XUE Xiaoming2, LI Jianwei4,*(), LI Mingshi1,5   

  1. 1. College of Forestry, Nanjing Forestry University, Nanjing 210037, China
    2. College of Criminal Science and Technology, Nanjing Forest Police College; Key Laboratory of State Forest and Grassland Administration on Wildlife Evidence Technology, Nanjing 210023, China
    3. Linyi City Management Comprehensive Service Center, Linyi 276000, China
    4. Dali Branch of Yunnan Forestry Survey and Planning Institute, Dali 671000, China
    5. College of Forestry, Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
  • Received:2021-01-08 Accepted:2021-04-18 Online:2022-03-30 Published:2022-04-08
  • Contact: LI Jianwei E-mail:111207@nfpc.edu.cn;dalijw@163.com

Abstract:

【Objective】Efficient and reliable extraction of land cover change information plays an important role in formulating management and protection plans for national parks. The primary objective of the current work was to develop an efficient and economical remote sensing detection method to extract land cover change information in the Qianjiangyuan National Park pilot area from 2001 to 2017, and to assess the effectiveness of the adopted protection and management measures. 【Method】A land cover classification scheme, including cropland, forest, grassland, water, artificial surface, and bare land, was first defined, followed by the selection of the historical training dataset using an enhanced visual interpretation method. Next, the original spectral bands, spectral indices, and textural features derived from Landsat multi-season composite data and terrain features were incorporated as input variables for implementing the random forest classification algorithm in the Google Earth Engine (GEE)cloud platform to generate land cover datasets. Finally, the major land cover conversion types and their spatial distributions were mapped by establishing land cover conversion rules. 【Result】The validation results derived from an independent sample set indicated that the overall accuracies for the 2001, 2009 and 2017 classifications were 83.12%, 81.82% and 87.35%, respectively. Afforestation activities, cropland abandonment, and distributions of development and construction projects demonstrated the effectiveness of the protection and management measures adopted in this park. 【Conclusion】The enhanced visual interpretation process helps to identify historical sample points efficiently and reliably to support the creation of historical land cover datasets. With cloud computing-based change detection technology, it is possible to quickly assess the protection and management efficacy and locate ecologically vulnerable zones. Moreover, the method has the advantages of high efficiency, economy, and fewer limitations on computing resources; thus, the GEE-based land cover change detection method proposed in the current work is suitable for an application in other similar scenarios.

Key words: Qianjiangyuan National Park, land cover change, remote sensing monitoring, Google Earth Engine(GEE), enhanced visual interpretation

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