Probabilistic Wildfire Risk Flame Length Probability 1 CONUS (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.

本数据集基于美国农业部森林服务密苏拉森林科学实验室开发的地理空间火灾模拟（FSim）系统，针对美国本土、阿拉斯加及夏威夷地区，生成了火灾概率（BP）和条件火焰长度概率（FLP）的全国性数据。FSim系统集成了天气生成、野火发生、火灾增长和火灾抑制等模块，旨在模拟数十万个假设的现代火灾季节，以估算特定区域（即像素）在当前景观条件和火灾管理措施下被燃烧的概率。所提供的数据代表美国在270米网格空间分辨率下的模拟BP和FLP。火焰长度概率估计针对六个标准的火灾强度等级。六个FLP分别对应火焰长度等级如下：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数据指示条件概率（即表示在一定强度级别下发生燃烧的可能性，前提是火灾发生），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，该目录输入至 https://data.gov 目录。本记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS地理服务。欲获取完整信息，请访问 https://data.gov。