Monitoring Trends in Burn Severity Thematic Burn Severity Mosaic (ver. 8.0, April 2024)

The Monitoring Trends in Burn Severity (MTBS) Program assesses the frequency, extent, and magnitude (size and severity) of all large wildland fires (wildfires and prescribed fires) in the conterminous United States (CONUS), Alaska, Hawaii, and Puerto Rico for the period 1984 and beyond. All fires reported as greater than 1,000 acres in the western U.S. and greater than 500 acres in the eastern U.S. are mapped across all ownerships. MTBS produces a series of geospatial and tabular data for analysis at a range of spatial, temporal, and thematic scales and are intended to meet a variety of information needs that require consistent data about fire effects through space and time. This map layer is a thematic raster image of MTBS burn severity classes for all inventoried fires occurring during each calendar year. Fires omitted from this mapped inventory are those where suitable satellite imagery was not available, or fires were not discernable from available imagery. First posted - Febuary 24, 2021 Revised - June 28, 2022 (version 2.0) Revised - January 6, 2023 (version 3.0) Revised - March 31, 2023 (version 4.0) Revised - August 8, 2023 (version 5.0) Revised - October 26, 2023 (version 6.0) Revised - January 23, 2024 (version 7.0) Revised - April 29, 2024 (version 8.0)

火灾严重程度监测趋势项目（Monitoring Trends in Burn Severity, MTBS）旨在评估1984年至今美国本土（CONUS）、阿拉斯加、夏威夷及波多黎各境内所有大型野外火灾（野火与计划火烧）的发生频率、波及范围与强度（规模与严重程度）。美国西部大于1000英亩、东部大于500英亩的上报火灾，将被纳入全土地权属类别的制图工作。MTBS 产出一系列地理空间与表格数据，支持多空间、时间及主题尺度下的分析工作，旨在满足各类对跨时空火灾影响一致性数据的信息需求。本地图图层为各日历年度内所有纳入清查的火灾对应的MTBS火灾严重程度等级专题栅格影像。未纳入本制图清查范围的火灾包括无可用合格卫星影像的火灾，或无法从现有影像中识别的火灾。首次发布——2021年2月24日；修订——2022年6月28日（版本2.0）；修订——2023年1月6日（版本3.0）；修订——2023年3月31日（版本4.0）；修订——2023年8月8日（版本5.0）；修订——2023年10月26日（版本6.0）；修订——2024年1月23日（版本7.0）；修订——2024年4月29日（版本8.0）