vegetation coverage estimation using remote sensing vegetation index and leaf area index
DESCRIPTION
Vegetation Coverage Estimation Using Remote Sensing Vegetation Index and Leaf Area Index Jingfeng Huang, Daoyi Chen School of Mechanical, Aerospace and Civil Engineering The University of Manchester Manchester, M60 1QD, United Kingdom [email protected] - PowerPoint PPT PresentationTRANSCRIPT
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
<<11>>
Vegetation Coverage Estimation Using Vegetation Coverage Estimation Using Remote Sensing Vegetation Index and Remote Sensing Vegetation Index and
Leaf Area IndexLeaf Area Index
Jingfeng Huang, Daoyi ChenJingfeng Huang, Daoyi Chen
School of Mechanical, Aerospace and Civil Engineering School of Mechanical, Aerospace and Civil Engineering The University of Manchester The University of Manchester
Manchester, M60 1QD, United KingdomManchester, M60 1QD, United Kingdom
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
<<22>>
• To investigate the potential of vegetation indices To investigate the potential of vegetation indices to estimate vegetation coverage;to estimate vegetation coverage;
• To understand the physical process the To understand the physical process the vegetation coverage grows;vegetation coverage grows;
• To estimate vegetation coverage from LAI and To estimate vegetation coverage from LAI and NDWI.NDWI.
• To explore the potential applications of To explore the potential applications of expolinear relationships between LAI, VI and expolinear relationships between LAI, VI and Vegetation coverage. Vegetation coverage.
ObjectivesObjectives
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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Study AreaStudy Area
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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Vegetation Index vs LAIVegetation Index vs LAI
0.0
1.0
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-0.2 -0.1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0VI
LA
I
NDVI
NDWI
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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Vegetation Index vs LAIVegetation Index vs LAI
y = 0.2176Ln(x) + 0.0962
R2 = 0.7108
-0.6
-0.4
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0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5LAI
ND
WI
Corn
Soybean
LAI = (2 * NDWI + 0.6) (1 + 0.5 EXP (3.0 NDWI)),R2 = 0.71
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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LAI vs Vegetation CoverageLAI vs Vegetation Coverage
y = 33.512Ln(x) + 46.018
R2 = 0.7944
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0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5LAI
Veg
etat
ion
Cov
erag
e (%
)
Corn
Soybean
LAI = 2 f (1 + 0.05 EXP (3.4 f)), R2 = 0.70
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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VI vs Vegetation CoverageVI vs Vegetation Coverage
y = 114.52x + 42.603
R2 = 0.6698
y = 117.84x + 2.7308
R2 = 0.6763
y = 187.1x - 71.309
R2 = 0.7291
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-0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0VI
Veg
etat
ion
Cov
erag
e (%
)
Corn_NDVI
Corn_NDWI1640
Corn_NDWI2130
y = 126.72x - 34.239
R2 = 0.4144
y = 110.04x + 15.548
R2 = 0.5161
y = 92.455x + 41.124
R2 = 0.3249
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VI
Veg
etat
ion
Cov
erag
e (%
)
Soybean_NDVISoybean_NDWI1640Soybean_NDWI2130
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
<<88>>
0.0
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Vegetation Coverage %
ND
VI
Corn
Soybean
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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-0.2
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Vegetation Coverage %
ND
WI2
13
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Corn
Soybean-0.3
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Vegetation Coverage %
ND
WI1
64
0
Corn
Soybean
LAI, Vegetation Indices, Vegetation Coverage (Jingfeng Huang; Daoyi Chen)
2005 CARE UK AGM2005 CARE UK AGM
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ConclusionsConclusions1. In this ‘vegetation oriented’ study, the collapsed expolinear relationship between
Vegetation Index (VI) and Leaf Area Index (LAI) was disclosed for corn and soybean.
2. The NIR&SWIR based Normalized Vegetation Water Index (NDWI) which are superior to NIR&VIS-based NDVI were used to estimate LAI and Vegetation Coverage.
3. It is believed that vegetation leaf area is the dominant parameter to determine the surface reflectance values of spectral bands in remote sensing satellites.
4. Moreover, vegetation coverage and LAI are following another expolinear relationship which seems also identical for corn and soybean.
5. Results evidenced leaf area index is a promising index to estimate vegetation coverage accurately, although physically both vertical accumulation of leaf layers and horizontal expansion of leaf area are contributing to LAI growth.
6. If such vegetation species independency can be extended to trees and grasslands in urban area, the methodology will propose an easy but efficient way to estimate vegetation coverage in urban sustainable development.