Retrieval of Vegetation Indices Related to Leaf Water Content from a Single Index: A Case Study of Eucalyptus globulus (Labill.) and Pinus radiata (D. Don.)
Abstract
:1. Introduction
2. Materials and Methods
2.1. Leaf Sampling
2.2. Reflectance Measurement and Dehydration Process
2.3. Moisture Content and Vegetation Indices
2.4. Vegetation Index Retrieval
2.5. Model Evaluation Metrics
2.6. Non-Water Content Related VIs
3. Results
3.1. Model Fitting
3.2. Retrieval of Non-Water Content Related VIs
4. Discussion
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
EM | Electromagnetic |
FMC | Fuel Moisture Content |
Coefficient of determination | |
VI | Vegetation index |
Appendix A. Vegetation Indices Variation versus Fuel Moisture Content
References
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Instrument | Specifications | |
---|---|---|
Spectrometer | Model | Terraspec 4 Hi-Res |
Manufacturer | ASD | |
Range | 350–2500 nm | |
Spectral resolution | 3 nm at 700 nm, 6 nm at 1400 nm | |
Scale | Model | PFB 120-3 |
Manufacturer | KERN | |
Max. weighing | 120 g | |
Reproducibility | 0.001 g | |
Oven | Model | UN30 |
Manufacturer | Memmert | |
Range | 20 C to 30 C | |
Temperature accuracy | up to 99.9 C: 0.1 |
Acronym | Vegetation Index | Formulation | Source |
---|---|---|---|
DDI | Double Difference Index | [6,7] | |
EVI | Enhanced Vegetation Index | [11] | |
fWBI | Floating-position Water Band Index | [12] | |
LWI | Leaf Water Index | [13] | |
MSI | Moisture Stress Index | [14] | |
MSI1 | Moisture Stress Index 1 | [15] | |
MSI2 | Moisture Stress Index 2 | [15] | |
NDII | Normalized Difference Infrared Index | [16] | |
NDWI1 | Normalized Difference Water Index 1 | [17] | |
NDWI2 | Normalized Difference Water Index 2 | [18] | |
SIWSI | Shortwave Infrared Water Stress | [19] | |
SRWI | Simple Ratio Water Index | [20] | |
SRWI1 | Simple Ratio Water Index 1 | [18] | |
SRWI2 | Simple Ratio Water Index 2 | [18] | |
TM57 | Ratio of Thematic Mapper Band 5 to Band 7 | [21] | |
VARI | Visible Atmospheric Resistant Index | [22] | |
WBI | Water Band Index | [23] | |
WI | Water Index | [24] |
Acronym | Vegetation Index | Formulation | Source |
---|---|---|---|
NRI | Nitrogen reflectance index | [27] | |
ARI | Anthocyanin reflectance index | [28] | |
CI | Carotenoid Index | [29] | |
NDVI | Normalized Difference Vegetation Index | [30] |
Vegetation Index | P. radiata | E. globulus |
---|---|---|
DDI | 0.5263 | 0.7379 |
EVI | 0.2898 | 0.2061 |
fWBI | 0.6286 | 0.6567 |
LWI | 0.7742 | 0.8699 |
MSI | 0.6668 | 0.7892 |
MSI1 | 0.6497 | 0.7637 |
MSI2 | 0.6566 | 0.7559 |
NDII | 0.6599 | 0.7600 |
NDWI1 | 0.5702 | 0.6062 |
NDWI2 | 0.5643 | 0.6042 |
SIWSI | 0.6681 | 0.7696 |
SRWI | 0.5710 | 0.6068 |
SRWI1 | 0.7321 | 0.7818 |
SRWI2 | 0.5733 | 0.6146 |
TM57 | 0.6450 | 0.7497 |
VARI | 0.5101 | 0.1525 |
WBI | 0.6359 | 0.6606 |
WI | 0.6344 | 0.6616 |
Pinus radiata | Eucalyptus globulus | |||||
---|---|---|---|---|---|---|
RMSE | Bias (%) | RMSE | Bias (%) | |||
NRI | 0.0338 | 0.9243 | −75.9749 | 0.0588 | 0.7870 | −9.9942 |
ARI | 0.0073 | 0.7735 | −0.6143 | 0.0201 | 0.7475 | 1.0940 |
CI | 0.0898 | 0.8898 | 10.2368 | 0.0530 | 0.7908 | −0.6564 |
NDVI | 0.0464 | 0.9507 | 5.4369 | 0.0364 | 0.9244 | 4.5324 |
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Villacrés, J.; Fuentes, A.; Reszka, P.; Cheein, F.A. Retrieval of Vegetation Indices Related to Leaf Water Content from a Single Index: A Case Study of Eucalyptus globulus (Labill.) and Pinus radiata (D. Don.). Plants 2021, 10, 697. https://doi.org/10.3390/plants10040697
Villacrés J, Fuentes A, Reszka P, Cheein FA. Retrieval of Vegetation Indices Related to Leaf Water Content from a Single Index: A Case Study of Eucalyptus globulus (Labill.) and Pinus radiata (D. Don.). Plants. 2021; 10(4):697. https://doi.org/10.3390/plants10040697
Chicago/Turabian StyleVillacrés, Juan, Andrés Fuentes, Pedro Reszka, and Fernando Auat Cheein. 2021. "Retrieval of Vegetation Indices Related to Leaf Water Content from a Single Index: A Case Study of Eucalyptus globulus (Labill.) and Pinus radiata (D. Don.)" Plants 10, no. 4: 697. https://doi.org/10.3390/plants10040697