ABoVE: Ignitions of ABoVE-FED Fires in Alaska and Canada

This dataset provides daily fire ignition locations and timing for boreal fires in Alaska, U.S., and Canada between 2001 and 2019. The fire ignition locations and timing are extracted from the ABoVE Fire Emission Database; however, the temperate prairies of Canada, the Atlantic Highlands, and Mixed Wood Plains were not included. Fires were detected from Landsat differenced normalized burn ratio (dNBR) and the daily MODIS burned area and active fire products. Detections by dNBR were limited to fire perimeters from national fire databases. Fire ignition locations were retrieved using a local minimum within the fire perimeters. However, when fire locations were confounded due to simultaneous active fire detections, the fire ignition location was set as the centroid of these pixels. A spatial uncertainty equaling the standard deviation of the pixels' coordinates and the nominal nadir of 1000 m was applied to the fire ignition location. The temporal resolution of the ignition timing is within one day. Data is provided in comma separated values (CSV) and shapefile formats.

本数据集提供了2001年至2019年间美国阿拉斯加及加拿大地区针叶林火灾的每日点火位置与时间信息。点火位置与时间数据源自ABoVE火成排放数据库；然而，加拿大温带草原、大西洋高地以及混交林平原地区并未纳入其中。火灾检测基于Landsat差分归一化燃烧比率（dNBR）以及每日MODIS燃烧区域和活跃火灾产品。dNBR检测局限于国家火灾数据库中的火灾边界。通过火灾边界内的局部最小值检索点火位置。然而，当由于同时存在的活跃火灾检测而导致点火位置难以确定时，将点火位置设定为这些像素的质心。对点火位置应用了等于像素坐标标准差的空间不确定性，以及1000米的标称视场角。点火时间的时序分辨率为一日。数据以逗号分隔值（CSV）和形状文件（shapefile）格式提供。