lai retrieval and validation using sentinel- 2 · 2016-12-08 · esa unclassified - for official...
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ESA | 01/01/2016 | Slide 1ESA UNCLASSIFIED - For Official Use
LAI retrieval and validation using Sentinel- 2
Roshanak Darvishzadeh, Tiejun Wang, Andrew Skidmore, Brian O’Connor,
Anton Vrieling, Chris McOwen, Marc Paganini
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ESA UNCLASSIFIED - For Official Use
ESA INNOVATOR III PROJECT- RS4EBV
In the framework of Remote Sensing for Essential Biodiversity Variables
(RS4EBV)
To develop methods to map and monitor EBVs from Sentinel-2 in support of
biodiversity conservation
The potential of high-resolution multispectral satellite imageries (RapidEye, 2015),
(Sentinel-2, 2016) for retrieval of LAI is considered
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ESA UNCLASSIFIED - For Official Use
LAI as a Key structural
characteristicModeling of vegetation productivityevapotranspiration
Quantitative analysisIn global ecology
Vegetation abundanceVegetative development
Exchange of energyand nutrient
Controlling biological and physical processes
Leaf area index (LAI)
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LAI Estimation
Field & Laboratory
Remote Sensing
Statistical Approach
Physical Approach
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Study area Location: 53°30′ N, 6°10′ E
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• Field works were performed for two subsequent years
• July 2015: 30 plots were measured in Schiermonnikoog, NL
• July 2016: 20 plots were measured in Schiermonnikoog, NL
LAI, canopy height, canopy percentage, .. Leaf chlorophyll
content, .
Field Measurements
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ESA UNCLASSIFIED - For Official Use
Vegetation cover and distribution of sample points
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Schiermonnikoog, The Netherlands
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Recording coordinates in each subplots
Recording grass structure and species abundance
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Measuring above canopy radiation for calculation of Leaf Area Index (LAI)
Chlorophyll measurement
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ESA UNCLASSIFIED - For Official Use
spectral response to LAI variation
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Method
8
Model parameterization
Sensitivity analysis
Forward modeling(PROSAIL)
Model inversion(LUT
search)
Validation LAI MAP
LUT
Sentinel-2 Reflectance
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Sensitivity analysis of RapidEye and Sentinel-2 to LAI variations
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ESA UNCLASSIFIED - For Official Use
R2=0.35 RMSE 1.644
Measured and Estimated LAI using RapidEye 6-8-2015
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ESA UNCLASSIFIED - For Official Use
LAI map for the Schiermonnikoog, using the RapidEye image
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ESA UNCLASSIFIED - For Official Use
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ESA UNCLASSIFIED - For Official Use
LAI map for the Schiermonnikoog, using the Sentinel-2 image
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ESA UNCLASSIFIED - For Official Use
Conclusions & Recommendations
• The Obtained results can be further improved by accurate
calibration/parametrization of models (more Sampling)
• As the results of the sensitivity analysis revealed higher
accuracy was observed using Sentinel-2 data
• Field data collection is extremely important and is the only way
to validate the RS products
• The field data used for validations need to be standardized!
(Protocols)
• Time and cost limit the data collection (extension of networks)
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ESA UNCLASSIFIED - For Official Use
Field measurements for validation of Sentinel-2 data Pretoria, SA22-11-2016