Special Section on Remote Sensing Applications to Wildland Fire Research in the Eastern United States: Selected Papers from the 2007 EastFIRE Conference - Part 2

Constrained radiative transfer inversions for vegetation moisture retrievals in grasslands

[+] Author Affiliations
Swarvanu Dasgupta, John J. Qu, Sanjeeb Bhoi

EastFire Lab, College of Sciences, George Mason University, 10404 University Drive, Fairfax, Virginia 22030

J. Appl. Remote Sens. 3(1), 031503 (January 20, 2009). doi:10.1117/1.3075052
History: Received October 17, 2007; Revised October 20, 2008; Accepted December 8, 2008; January 20, 2009; Online January 20, 2009
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Abstract

The retrieval of Live Fuel Moisture Content (LFMC) over fire prone grasslands is important for fire risk and drought assessment. Radiative transfer (RT) model based inversion of measured reflectances for retrievals of LFMC offers a promising method for estimating LFMC. This paper evaluates the extent to which inverse RT model based LFMC retrievals over grasslands can be improved by the use of prior information on soil moisture and LAI. However due to the uncertainty in the procedures used in obtaining the pre-retrieval information about LAI and soil moisture, the prior information is more likely to be in terms of an expected range for LAI and soil moisture rather than exact values. This study uses simulations from coupled soil-leaf-canopy radiative transfer models to investigate the extent to which such categorical prior information may reduce the uncertainty in LFMC retrievals. Results show that under the experimental conditions used in this study, prior information on LAI and soil moisture improves LFMC estimation on the average by about 2.3 to 3.4% (absolute LFMC) depending on the quality and accuracy of the prior information. This can be equivalent to a relative improvement of about 18-27%. This can be significant, since at the dry conditions represented by this study, when fire spread is highly sensitive to LFMC, such improvements in LFMC could considerably improve fire spread predictions and aid fire management decision making. Uncertainty analysis in terms of prediction intervals and standard deviation of errors also show that improvements are significant.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Swarvanu Dasgupta ; John J. Qu and Sanjeeb Bhoi
"Constrained radiative transfer inversions for vegetation moisture retrievals in grasslands", J. Appl. Remote Sens. 3(1), 031503 (January 20, 2009). ; http://dx.doi.org/10.1117/1.3075052


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