Review of forest Leaf Area Index retrieval over rugged terrain based on remotely sensed data

  • role: First author第一作者
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

  • Email:minhe81@163.com
  • Introduction:E-mail minhe81@163.com
HE Min12,  
  • role: Corresponding author通信作者
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

  • Email:wenjg@radi.ac.cn
  • Introduction:E-mail wenjg@radi.ac.cn
WEN Jianguang12*,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

YOU Dongqing1,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

TANG Yong1,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

WU Shengbiao12,  
  • Affiliation:

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China

    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

HAO Dalei12,  
  • Affiliation:

    College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 430074, China

LIN Xingwen3,  
  • Affiliation:

    School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 321004, China

GONG Zhangrong4

реферат

Leaf Area Index (LAI), an essential climate variable that characterizes vegetation canopy structure, is essential in ecological and hydrological processes. Global scale LAI remote sensing products had been generated and widely used in the research of ecological environment. Most existing LAI retrieval algorithms assume that the land surface is flat and homogeneous, thereby demonstrating good performance in a homogeneous land surface. However, many studies have demonstrated that neglecting the influence of topography may cause large biases and uncertainties of the estimated LAI in a mountain area. A rugged terrain can not only distort radiation in different slopes and aspects but also cause shadows due to neighboring topographic effects. Forest occupies a large proportion of the land surface and has the most complex structure over rugged terrain, attracting greater attention to estimate accurate LAI due to its great contributions to the ecological environment. In this work, we systematically summarized the LAI retrieval algorithms and global remote sensing products and investigated the major challenges when applying those algorithms to LAI inversion over rugged terrain. Thereafter, we reviewed the main LAI retrieval methods, including topographic correction methods and the mountain radiative transfer models. Finally, the topographic and scale effects of the field in situ LAI data over a rugged terrain were discussed. The comprehensive summary and prospects show that great advances in remote sensing observations, radiation transfer modeling, machine learning techniques, etc. provide a promising way toward accurate LAI estimations and reliable validation over a rugged terrain.

ключеви́че слова́

leaf area index;topography;remote sensing;retrievel;statistical model;canopy reflectance model;validation

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