Probabilistic Wildfire Risk Flame Length Probability 1 Alaska (Image Service)

National data on burn probability (BP) and conditional flame-length probability (FLP) were generated for the conterminous United States (CONUS), Alaska, and Hawaii using a geospatial Fire Simulation (FSim) system developed by the USDA Forest Service Missoula Fire Sciences Laboratory. The FSim system includes modules for weather generation, wildfire occurrence, fire growth, and fire suppression. FSim is designed to simulate the occurrence and growth of wildfires under tens of thousands of hypothetical contemporary fire seasons in order to estimate the probability of a given area (i.e., pixel) burning under current landscape conditions and fire management practices. The data presented here represent modeled BP and FLPs for the United States (US) at a 270-meter grid spatial resolution. Flame-length probability is estimated for six standard Fire Intensity Levels. The six FLPs correspond to flame-length classes as follows: FLP1 = < 2 feet (ft); FLP2 = 2 < 4 ft.; FLP3 = 4 < 6 ft.; FLP4 = 6 < 8 ft.; FLP5 = 8 < 12 ft.; FLP6 = 12+ ft. Because they indicate conditional probabilities (i.e., representing the likelihood of burning at a certain intensity level, given that a fire occurs), the FLP data must be used in conjunction with the BP data for risk assessment.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService For complete information, please visit https://data.gov.

国家层面关于燃烧概率（BP）及条件火焰长度概率（FLP）的数据集已通过美国农业部森林服务密苏拉火灾科学实验室开发的地理空间火灾模拟（FSim）系统生成，该系统涵盖了美国大陆、阿拉斯加和夏威夷地区。FSim系统集成了天气生成、野火发生、火势蔓延和火灾扑救等模块。该系统旨在模拟数万个假设的现代火灾季节，以估算在当前景观条件和火灾管理措施下，特定区域（即像素）燃烧的概率。本数据集中展示的是美国270米网格空间分辨率下的模拟BP和FLP。火焰长度概率基于六个标准火强度级别进行估算。六个FLP分别对应火焰长度类别如下：FLP1 = < 2英尺（ft）；FLP2 = 2 < 4 ft；FLP3 = 4 < 6 ft；FLP4 = 6 < 8 ft；FLP5 = 8 < 12 ft；FLP6 = 12+ ft。由于FLP数据表示的是条件概率（即表示在发生火灾的条件下，燃烧某一强度级别的可能性），因此在进行风险评估时，必须将FLP数据与BP数据结合使用。本记录来源于美国农业部企业数据目录，并纳入https://data.gov目录。本记录的数据资源包括以下内容：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS GeoService。欲获取完整信息，请访问https://data.gov。