Generating annual estimates of forest fire disturbance in Canada: the National Burned Area Composite
R. J. Hall A , R. S. Skakun A C , J. M. Metsaranta A , R. Landry B , R.H. Fraser B , D. Raymond B , M. Gartrell A , V. Decker B and J. Little A
+ Author Affiliations
- Author Affiliations
A Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, 5320 – 122 Street, Edmonton, AB T6H 3S5, Canada.
B Natural Resources Canada, Canada Centre for Mapping and Earth Observation, 560 Rochester Street, Ottawa, ON K1S 5K2 Canada.
C Corresponding author. Email: rob.skakun@canada.ca
International Journal of Wildland Fire 29(10) 878-891 https://doi.org/10.1071/WF19201
Submitted: 3 December 2019 Accepted: 12 July 2020 Published: 5 August 2020
Journal Compilation © IAWF 2020 Open Access CC BY-NC-ND
Abstract
Determining burned area in Canada across fire management agencies is challenging because of different mapping scales and methods. The inconsistent removal of unburned islands and water features from within burned polygon perimeters further complicates the problem. To improve the determination of burned area, the Canada Centre for Mapping and Earth Observation and the Canadian Forest Service developed the National Burned Area Composite (NBAC). The primary data sources for this tool are an automated system to derive fire polygons from 30-m Landsat imagery (Multi-Acquisition Fire Mapping System) and high-quality agency polygons delineated from imagery with spatial resolution ≤30 m. For fires not mapped by these sources, the Hotspot and Normalized Difference Vegetation Index Differencing Synergy method was used with 250–1000-m satellite data. From 2004 to 2016, the National Burned Area Composite reported an average of 2.26 Mha burned annually, with considerable interannual variability. Independent assessment of Multi-Acquisition Fire Mapping System polygons achieved an average accuracy of 96% relative to burned-area data with high spatial resolution. Confidence intervals for national area burned statistics averaged ±4.3%, suggesting that NBAC contributes relatively little uncertainty to current estimates of the carbon balance of Canada’s forests.
Additional keywords: boreal forest, fire perimeters, fire refugia, Landsat, NBR, post-fire, unburned islands.
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