Improving UAV-Based LAI Estimation for Forests Over Complex Terrain by Reducing Topographic Effects on Multispectral Reflectance

被引:6
作者
Cheng, Zhiqiang [1 ,2 ]
Chen, Jing M. [1 ,2 ,3 ]
Guo, Zhenxiong [2 ]
Miao, Guofang [2 ,4 ]
Zeng, Hongda [2 ,4 ]
Wang, Rong [2 ,4 ]
Huang, Zhiqun [2 ,4 ]
Wang, Yang [2 ,4 ]
机构
[1] Fujian Normal Univ, Inst Geog, Fuzhou 350108, Fujian, Peoples R China
[2] Fujian Normal Univ, Sch Geog Sci, Fuzhou 350108, Fujian, Peoples R China
[3] Univ Toronto, Dept Geog & Planning, Toronto, ON M5S 3G3, Canada
[4] Fujian Normal Univ, Fujian Prov Key Lab Subtrop Resources & Environm, Fuzhou 350108, Fujian, Peoples R China
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2024年 / 62卷
关键词
Incident solar radiation; leaf area index (LAI); topographic effects; unmanned aerial vehicle (UAV); LEAF-AREA INDEX; SATELLITE IMAGERY; VEGETATION INDEX; SLOPE CORRECTION; MODEL; LIDAR; ILLUMINATION; IMPROVEMENT; VALIDATION; ELEVATION;
D O I
10.1109/TGRS.2023.3337177
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Leaf area index (LAI) is a key parameter for characterizing the dynamics of terrestrial ecosystems and is also one of the important structural parameters that can be retrieved from remote sensing (RS) data. LAI over mountainous areas, however, is still difficult to retrieve reliably due to the topographical variation that introduces significant uncertainties into observed reflectance. In this article, we proposed a new scheme to estimate topographic influence on ratio-based vegetation indices (VIs) from diffuse radiation, which is not yet adequately considered in existing topographic correction schemes. In our scheme, unmanned aerial vehicle (UAV) light detecting and ranging (LiDAR) data were first used to model the sky view factor (SVF) and terrain view factor of target pixels in a slope coordinate system. Based on these view factors, the total incident solar radiation on slope (ISRS) was corrected, specifically for the diffuse sky irradiance and adjacent terrain-reflected irradiance over complex terrains. we then recalculated the multispectral reflectance of UAV images and evaluated the topographic effects on the normalized difference vegetation index (NDVI) because the magnitudes of correction on red and near-infrared (NIR) reflectances are quite different. Finally, large-scale LAI distribution was retrieved by empirical models developed from the relationships between terrain-corrected NDVI and field-measured LAI. Our results show that the proposed topographic correction scheme can significantly improve the LAI retrievals over a growing season. Given that forests are widely distributed in complex terrains around the globe, this study would have significance in improving the mapping of global LAI that is essential for terrestrial carbon cycle studies.
引用
收藏
页码:1 / 19
页数:19
相关论文
共 75 条
[1]   Accuracy Assessment of GEDI Terrain Elevation and Canopy Height Estimates in European Temperate Forests: Influence of Environmental and Acquisition Parameters [J].
Adam, Markus ;
Urbazaev, Mikhail ;
Dubois, Clemence ;
Schmullius, Christiane .
REMOTE SENSING, 2020, 12 (23) :1-28
[2]   Monitoring the structure of forest restoration plantations with a drone-lidar system [J].
Almeida, D. R. A. ;
Broadbent, E. N. ;
Zambrano, A. M. A. ;
Wilkinson, B. E. ;
Ferreira, M. E. ;
Chazdon, R. ;
Meli, P. ;
Gorgens, E. B. ;
Silva, C. A. ;
Stark, S. C. ;
Valbuena, R. ;
Papa, D. A. ;
Brancalion, P. H. S. .
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION, 2019, 79 :192-198
[3]   On measuring net ecosystem carbon exchange over tall vegetation on complex terrain [J].
Baldocchi, D ;
Finnigan, J ;
Wilson, K ;
Paw U, KT ;
Falge, E .
BOUNDARY-LAYER METEOROLOGY, 2000, 96 (1-2) :257-291
[4]  
Bayanuddin A. A., 2021, PROC 7 GEOINFORMATIO, V12082, P1
[5]   The use of the Minnaert correction for land-cover classification in mountainous terrain [J].
Blesius, L ;
Weirich, F .
INTERNATIONAL JOURNAL OF REMOTE SENSING, 2005, 26 (17) :3831-3851
[6]   A four-scale bidirectional reflectance model based on canopy architecture [J].
Chen, JM ;
Leblanc, SG .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1997, 35 (05) :1316-1337
[7]   DEFINING LEAF-AREA INDEX FOR NON-FLAT LEAVES [J].
CHEN, JM ;
BLACK, TA .
PLANT CELL AND ENVIRONMENT, 1992, 15 (04) :421-429
[8]   Leaf area index of boreal forests: Theory, techniques, and measurements [J].
Chen, JM ;
Rich, PM ;
Gower, ST ;
Norman, JM ;
Plummer, S .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1997, 102 (D24) :29429-29443
[9]   PLANT CANOPY GAP-SIZE ANALYSIS THEORY FOR IMPROVING OPTICAL MEASUREMENTS OF LEAF-AREA INDEX [J].
CHEN, JM ;
CIHLAR, J .
APPLIED OPTICS, 1995, 34 (27) :6211-6222
[10]  
CHEN JM, 1993, J APPL METEOROL, V32, P1656, DOI 10.1175/1520-0450(1993)032<1656:MFCPPF>2.0.CO