Document


Title

Using long-term SAR backscatter data to monitor post-fire vegetation recovery in tundra environment
Document Type: Journal Article
Author(s): Zhiwei Zhou; Lin Liu; Liming Jiang; Wanpeng Feng; Sergey V. Samsonov
Publication Year: 2019

Cataloging Information

Keyword(s):
  • Anaktuvuk River Fire
  • backscatter
  • post-fire recovery
  • SAR - synthetic aperture radar
  • tundra fire
  • vegetation recovery
Region(s):
Record Maintained By:
Record Last Modified: November 5, 2019
FRAMES Record Number: 58913

Description

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.

Online Link(s):
Citation:
Zhou, Zhiwei; Liu, Lin; Jiang, Liming; Feng, Wanpeng; Samsonov, Sergey V. 2019. Using long-term SAR backscatter data to monitor post-fire vegetation recovery in tundra environment. Remote Sensing 11(19):2230.