A physical model for LAI retrieval: directional second derivative of canopy spectra

B. Y. Yan; W. J. Fan; X. R. Xu; X. C. Liu; Y. K. Cui

doi:10.1117/12.866141

22 October 2010 A physical model for LAI retrieval: directional second derivative of canopy spectra

B. Y. Yan, W. J. Fan, X. R. Xu, X. C. Liu, Y. K. Cui

Proceedings Volume 7824, Remote Sensing for Agriculture, Ecosystems, and Hydrology XII; 78241K (2010) https://doi.org/10.1117/12.866141
Event: SPIE Remote Sensing, 2010, Toulouse, France

Abstract

Hyperspectral and multi-angular data provides an opportunity to accurately retrieve LAI and other biophysical parameters for vegetation monitoring. Based on a vegetation canopy BRDF model, the Directional Second Derivative (DSD) method has been obtained. In order to further evaluate the performance of the method, canopy reflectance spectra at different LAI values and different view angles are simulated using PROSAIL models first. Then LAI are retrieved from the spectra using DSD, SD (Second Derivative) and BRDF model inversion method. Results show that DSD is the most accurate and stable method compared with the other two. It also indicates that the optimal direction for LAI retrieval is near the hot spot. Finally, the single-angular Hyperion/EO-1 and multi-angular CHIRS/PROBA images are used to demonstrate the application of DSD method. The retrieved values are validated by ground measurements. The results are in good agreement with numerical simulations.

Citation Download Citation

B. Y. Yan, W. J. Fan, X. R. Xu, X. C. Liu, and Y. K. Cui "A physical model for LAI retrieval: directional second derivative of canopy spectra", Proc. SPIE 7824, Remote Sensing for Agriculture, Ecosystems, and Hydrology XII, 78241K (22 October 2010); https://doi.org/10.1117/12.866141

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KEYWORDS

Bidirectional reflectance transmission function

Reflectivity

Vegetation

Remote sensing

Data modeling

Atmospheric corrections

Fluctuations and noise

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