Deriving Vegetation Indices for 3D Canopy Chlorophyll Content Mapping Using Radiative Transfer Modelling

被引:1
|
作者
Elsherif, Ahmed [1 ]
Smigaj, Magdalena [2 ]
Gaulton, Rachel [3 ]
Gastellu-Etchegorry, Jean-Philippe [4 ]
Shenkin, Alexander [5 ]
机构
[1] Tanta Univ, Fac Engn, Tanta 31527, Egypt
[2] Wageningen Univ & Res, Lab Geoinformat Sci & Remote Sensing, NL-6708 PB Wageningen, Netherlands
[3] Newcastle Univ, Sch Nat & Environm Sci, Newcastle NE1 7RU, England
[4] Univ Toulouse, CESBIO, CNES, CNRS,IRD,UT3, F-31401 Toulouse 09, France
[5] Northern Arizona Univ Flagstaff, Sch Informat Comp & Cyber Syst, Flagstaff, AZ 86011 USA
来源
FORESTS | 2024年 / 15卷 / 11期
关键词
forest health; terrestrial LiDAR; plant health monitoring; terrestrial laser scanning; the DART model; 3D RTM; remote sensing of vegetation; REMOTE-SENSING DATA; LEAF CHLOROPHYLL; SPECTRAL REFLECTANCE; VERTICAL PROFILE; WATER-CONTENT; POINT CLOUD; FOREST; FRAMEWORK; NDVI;
D O I
10.3390/f15111878
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Leaf chlorophyll content is a major indicator of plant health and productivity. Optical remote sensing estimation of chlorophyll limits its retrievals to two-dimensional (2D) estimates, not allowing examination of its distribution within the canopy, although it exhibits large variation across the vertical profile. Multispectral and hyperspectral Terrestrial Laser Scanning (TLS) instruments can produce three-dimensional (3D) chlorophyll estimates but are not widely available. Thus, in this study, 14 chlorophyll vegetation indices were developed using six wavelengths employed in commercial TLS instruments (532 nm, 670 nm, 808 nm, 785 nm, 1064 nm, and 1550 nm). For this, 200 simulations were carried out using the novel bidirectional mode in the Discrete Anisotropic Radiative Transfer (DART) model and a realistic forest stand. The results showed that the Green Normalized Difference Vegetation Index (GNDVI) of the 532 nm and either the 808 nm or the 785 nm wavelengths were highly correlated to the chlorophyll content (R2 = 0.74). The Chlorophyll Index (CI) and Green Simple Ratio (GSR) of the same wavelengths also displayed good correlation (R2 = 0.73). This study was a step towards canopy 3D chlorophyll retrieval using commercial TLS instruments, but methods to couple the data from the different instruments still need to be developed.
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页数:22
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