Title
Temporal Decorrelation of C-Band Backscatter Coefficient in Mediterranean Burned Areas
Abstract
Burned area algorithms from radar images are often based on temporal differences between pre- and post-fire backscatter values. However, such differences may occur long past the fire event, an effect known as temporal decorrelation. Improvements in radar-based burned areas monitoring depend on a better understanding of the temporal decorrelation effects as well as its sources. This paper analyses the temporal decorrelation of the Sentinel-1 C-band backscatter coefficient over burned areas in Mediterranean ecosystems. Several environmental variables influenced the radar scattering such as fire severity, post-fire vegetation recovery, water content, soil moisture, and local slope and aspect were analyzed. The ensemble learning method random forests was employed to estimate the importance of these variables to the decorrelation process by land cover classes. Temporal decorrelation was observed for over 32% of the burned pixels located within the study area. Fire severity, vegetation water content, and soil moisture were the main drivers behind temporal decorrelation processes and are of the utmost importance for areas detected as burned immediately after fire events. When burned areas were detected long after fire (decorrelated areas), due to reduced backscatter coefficient variations between pre- to post-fire acquisitions, water content (soil and vegetation) was the main driver behind the backscatter coefficient changes. Therefore, for efficient synthetic aperture radar (SAR)-based monitoring of burned areas, detection, and mapping algorithms need to account for the interaction between fire impact and soil and vegetation water content.
Year
DOI
Venue
2019
10.3390/rs11222661
REMOTE SENSING
Keywords
DocType
Volume
C-band,burned area,temporal decorrelation,Sentinel-1,backscatter coefficient
Journal
11
Issue
Citations 
PageRank 
22
0
0.34
References 
Authors
0
3
Name
Order
Citations
PageRank
Miguel A. Belenguer-Plomer100.34
Emilio Chuvieco212020.78
Mihai A. Tanase3547.66