Wildfire Hazard Potential, Continuous 2023 United States and Alaska (Image Service)

This dataset is the 2023 version of wildfire hazard potential (WHP) for the United States. The files included in this data publication represent an update to any previous versions of WHP or wildland fire potential (WFP) published by the USDA Forest Service. WHP is an index that quantifies the relative potential for high-intensity wildfire that may be difficult to manage, used as a measure to help prioritize where fuel treatments may be needed. This 2023 version of WHP was created from updated national wildfire hazard datasets of annual burn probability and fire intensity generated by the USDA Forest Service, Rocky Mountain Research Station with the large fire simulation system (FSim). Vegetation and wildland fuels data from LANDFIRE 2020 (version 2.2.0) were the primary inputs to the updated FSim modeling work and therefore form the foundation for this version of the WHP. As such, the data presented here reflect landscape conditions as of the end of 2020. LANDFIRE 2020 vegetation and fuels data were also used directly in the WHP mapping process, along with updated point locations of fire occurrence ca. 1992-2020. With these datasets as inputs, we produced an index of WHP for all of the conterminous United States at 270-meter resolution. We present the final WHP map in two forms: 1) continuous integer values, and 2) five WHP classes of very low, low, moderate, high, and very high. On its own, WHP is not an explicit map of wildfire threat or risk, but when paired with spatial data depicting highly valued resources and assets such as structures or powerlines, it can approximate relative wildfire risk to those specific resources and assets. WHP is also not a forecast or wildfire outlook for any particular season, as it does not include any information on current or forecasted weather or fuel moisture conditions. It is instead intended for long-term strategic fuels management. These new data represent an update to all previous versions of WHP or WFP published by the USDA Forest Service. On 07/17/2024 this data package was updated to correct a data processing error that caused a very small number of pixels to be Nodata in the initial classified version that should have been Very High WHP. This update also included the addition of summaries tables by management jurisdictions. To check for the latest version of the WHP geospatial data and map graphics, as well as documentation on the mapping process, see: https://www.firelab.org/project/wildfire-hazard- potential. Details about the Wildfire Hazard Potential mapping process can be found in Dillon et al. (2015). Steps described in this paper about weighting for crown fire potential were dropped in the 2018 and subsequent versions due to changes to the FSim modeling products used as the primary inputs to WHP mapping. The intended use of this image service is to show, over large landscapes, where wildfires are likely to occur and how intense they may be. Limitations of use: WHP is also not a forecast or wildfire outlook for any particular season, as it does not include any information on current or forecasted weather or fuel moisture conditions. It is instead intended for long-term strategic fuels management. Update frequency: Data is static. This is the 2023 version of WHP for the United States. Future versions of this dataset will be published as separate services. For more information, refer to: https://research.fs.usda.gov/firelab/products/dataandtools/wildfire-hazard-potential本数据集为美国2023版野火灾害潜势（Wildfire Hazard Potential, WHP）数据。本数据出版物所包含的文件，是对美国农业部林务局（USDA Forest Service）此前发布的所有WHP或野地火灾潜势（Wildland Fire Potential, WFP）版本的更新。 WHP是一项用于量化高强度、难以管控野火相对发生潜势的指数，可作为优先确定可燃物处理需求区域的参考依据。 本次2023版WHP由美国农业部林务局落基山研究站通过大型火灾模拟系统（Fire Simulation, FSim）生成的更新版全国年度火灾概率与火灾强度野火灾害潜势数据集构建而成。LANDFIRE 2020（版本2.2.0）的植被与野地燃料数据，为本次更新的FSim建模工作提供了核心输入，也因此成为本版WHP的基础数据源。因此，本数据集所呈现的景观条件对应至2020年末。 LANDFIRE 2020植被与燃料数据还直接应用于WHP制图流程，同时辅以约1992-2020年的更新版火灾发生点位置数据。基于上述数据集作为输入，我们以270米的空间分辨率生成了美国本土全域的WHP指数。 最终WHP地图以两种形式呈现：1）连续整数值；2）极低、低、中等、高、极高五类WHP等级。 WHP本身并非野火威胁或风险的显性地图，但当其与描绘高价值资源与资产（如建筑或输电线路）的空间数据结合时，可用于估算这些特定资源与资产面临的相对野火风险。WHP也并非针对特定季节的野火预测或展望，因其未包含当前或预报的天气及燃料湿度相关信息，其设计初衷为长期战略级可燃物管理使用。 本套新数据是对美国农业部林务局此前发布的所有WHP或WFP版本的更新。 2024年7月17日，本数据包进行了更新，修正了一处数据处理错误：初始分类版本中极少量本该标记为极高WHP的像素被设为无数据（Nodata）。本次更新还新增了按管理辖区划分的汇总表。 如需获取最新版WHP地理空间数据、地图图形及制图流程文档，请访问：https://www.firelab.org/project/wildfire-hazard-potential。野火灾害潜势制图流程的详细信息可参见Dillon等人（2015）的研究。由于作为WHP制图核心输入的FSim建模产品发生变更，该文献中提及的冠层火灾潜势加权步骤在2018年及后续版本中已被移除。 本影像服务旨在展示大型景观范围内野火的易发区域及可能的火灾强度。 使用限制：WHP同样并非针对特定季节的野火预测或展望，因其未包含当前或预报的天气及燃料湿度相关信息，其设计初衷为长期战略级可燃物管理使用。更新频率：本数据为静态数据。本数据集为美国2023版WHP数据，后续版本将以独立服务形式发布。更多信息请参考：https://research.fs.usda.gov/firelab/products/dataandtools/wildfire-hazard-potential