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Generating annual estimates of forest fire disturbance in Canada: the National Burned Area Composite
International Journal of Wildland Fire ( IF 3.1 ) Pub Date : 2020-01-01 , DOI: 10.1071/wf19201
R. J. Hall , R. S. Skakun , J. M. Metsaranta , R. Landry , R.H. Fraser , D. Raymond , M. Gartrell , V. Decker , J. Little

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.

中文翻译:

生成加拿大森林火灾干扰的年度估计值:国家燃烧面积综合

由于不同的测绘比例尺和方法,跨火灾管理机构确定加拿大的烧毁面积具有挑战性。从燃烧的多边形周长内不一致地去除未燃烧的岛屿和水特征使问题进一步复杂化。为了改进对燃烧面积的确定,加拿大测绘和地球观测中心和加拿大森林服务局开发了国家燃烧面积综合 (NBAC)。此工具的主要数据源是一个自动化系统,用于从 30 米 Landsat 影像(多采集火灾地图系统)和从空间分辨率 ≤ 30 m 的影像中描绘出的高质量机构面派生火灾多边形。对于未由这些来源绘制的火灾,热点和归一化差异植被指数差异协同方法与 250-1000 米卫星数据一起使用。从 2004 年到 2016 年,国家燃烧面积综合报告平均每年燃烧 2.26 Mha,年际变化很大。相对于具有高空间分辨率的燃烧区域数据,对多采集火灾绘图系统多边形的独立评估实现了 96% 的平均准确度。全国面积燃烧统计数据的置信区间平均为 ±4.3%,表明 NBAC 对当前加拿大森林碳平衡估计的不确定性相对较小。
更新日期:2020-01-01
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