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Article

Forest Fuel Loads Estimation from Landsat ETM+ and ALOS PALSAR Data

1
School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
2
Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Alfonso Fernández-Manso
Received: 23 February 2021 / Revised: 18 March 2021 / Accepted: 18 March 2021 / Published: 20 March 2021
Fuel load is the key factor driving fire ignition, spread and intensity. The current literature reports the light detection and ranging (LiDAR), optical and airborne synthetic aperture radar (SAR) data for fuel load estimation, but the optical and SAR data are generally individually explored. Optical and SAR data are expected to be sensitive to different types of fuel loads because of their different imaging mechanisms. Optical data mainly captures the characteristics of leaf and forest canopy, while the latter is more sensitive to forest vertical structures due to its strong penetrability. This study aims to explore the performance of Landsat Enhanced Thematic Mapper Plus (ETM+) and Advanced Land Observing Satellite (ALOS) Phased Arrayed L-band Synthetic Aperture Radar (PALSAR) data as well as their combination on estimating three different types of fuel load—stem fuel load (SFL), branch fuel load (BFL) and foliage fuel load (FFL). We first analyzed the correlation between the three types of fuel load and optical and SAR data. Then, the partial least squares regression (PLSR) was used to build the fuel load estimation models based on the fuel load measurements from Vindeln, Sweden, and variables derived from optical and SAR data. Based on the leave-one-out cross-validation (LOOCV) method, results show that L-band SAR data performed well on all three types of fuel load (R2 = 0.72, 0.70, 0.72). The optical data performed best for FFL estimation (R2 = 0.66), followed by BFL (R2 = 0.56) and SFL (R2 = 0.37). Further improvements were found for the SFL, BFL and FFL estimation when integrating optical and SAR data (R2 = 0.76, 0.81, 0.82), highlighting the importance of data selection and combination for fuel load estimation. View Full-Text
Keywords: fire risk; forest fuel load; partial least squares regression; ALOS PALSAR L-band SAR; Landsat ETM+ fire risk; forest fuel load; partial least squares regression; ALOS PALSAR L-band SAR; Landsat ETM+
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MDPI and ACS Style

Li, Y.; Quan, X.; Liao, Z.; He, B. Forest Fuel Loads Estimation from Landsat ETM+ and ALOS PALSAR Data. Remote Sens. 2021, 13, 1189. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13061189

AMA Style

Li Y, Quan X, Liao Z, He B. Forest Fuel Loads Estimation from Landsat ETM+ and ALOS PALSAR Data. Remote Sensing. 2021; 13(6):1189. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13061189

Chicago/Turabian Style

Li, Yanxi, Xingwen Quan, Zhanmang Liao, and Binbin He. 2021. "Forest Fuel Loads Estimation from Landsat ETM+ and ALOS PALSAR Data" Remote Sensing 13, no. 6: 1189. https://0-doi-org.brum.beds.ac.uk/10.3390/rs13061189

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