Next Article in Journal
Urban Flood Mapping Using SAR Intensity and Interferometric Coherence via Bayesian Network Fusion
Next Article in Special Issue
Field-Validated Burn-Severity Mapping in North Patagonian Forests
Previous Article in Journal
Time-Series Analysis Reveals Intensified Urban Heat Island Effects but without Significant Urban Warming
Open AccessArticle

Using Long-Term SAR Backscatter Data to Monitor Post-Fire Vegetation Recovery in Tundra Environment

1
State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2
Earth Science System Programme, The Chinese University of Hong Kong, Hong Kong 999077, China
3
Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
4
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
5
Canada Centre for Mapping and Earth Observation, Natural Resources Canada, Ottawa, ON K1A 0E4, Canada
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(19), 2230; https://doi.org/10.3390/rs11192230
Received: 24 August 2019 / Revised: 18 September 2019 / Accepted: 21 September 2019 / Published: 25 September 2019
Wildfires could have a strong impact on tundra environment by combusting surface vegetation and soil organic matter. For surface vegetation, many years are required to recover to pre-fire level. In this paper, by using C-band (VV/HV polarization) and L-band (HH polarization) synthetic aperture radar (SAR) images acquired before and after fire from 2002 to 2016, we investigated vegetation change affected by the Anaktuvuk River Fire in Arctic tundra environment. Compared to the unburned areas, C- and L-band SAR backscatter coefficients increased by up to 5.5 and 4.4 dB in the severely burned areas after the fire. Then past 5 years following the fire, the C-band SAR backscatter differences decreased to pre-fire level between the burned and unburned areas, suggesting that vegetation coverage in burned sites had recovered to the unburned level. This duration is longer than the 3-year recovery suggested by optical-based Normalized Difference Vegetation Index (NDVI) observations. While for the L-band SAR backscatter after 10-year recovery, about 2 dB higher was still found in the severely burned area, compared to the unburned area. The increased roughness of the surface is probably the reason for such sustained differences. Our analysis implies that long records of space-borne SAR backscatter can monitor post-fire vegetation recovery in Arctic tundra environment and complement optical observations. View Full-Text
Keywords: arctic tundra fire; vegetation recovery; C- and L-band SAR; SAR backscatter arctic tundra fire; vegetation recovery; C- and L-band SAR; SAR backscatter
Show Figures

Graphical abstract

MDPI and ACS Style

Zhou, Z.; Liu, L.; Jiang, L.; Feng, W.; Samsonov, S.V. Using Long-Term SAR Backscatter Data to Monitor Post-Fire Vegetation Recovery in Tundra Environment. Remote Sens. 2019, 11, 2230.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop