California_Fire_Perimeters_1950_Onwards

This data should be used carefully for statistical analysis and reporting due to missing perimeters (see Use Limitation in metadata). Some fires are missing because historical records were lost or damaged, were too small for the minimum cutoffs, had inadequate documentation or have not yet been incorporated into the database. Other known errors with the fire perimeter database include duplicate fires and over-generalization. Over-generalization, particularly with large old fires, may show unburned "islands" within the final perimeter as burned. Users of the fire perimeter database must exercise caution in application of the data. Careful use of the fire perimeter database will prevent users from drawing inaccurate or erroneous conclusions from the data. This dataset may differ in California compared to that available from the National Interagency Fire Center (NIFC) due to different requirements between the two datasets. The data covers fires back to 1878. Please help improve this dataset by filling out this survey with feedback: Historic Fire Perimeter Dataset Feedback (arcgis.com) Current criteria for data collection are as follows: CAL FIRE (including contract counties) submit perimeters ≥10 acres in timber, ≥50 acres in brush, or ≥300 acres in grass, and/or ≥3 impacted residential or commercial structures, and/or caused ≥1 fatality. All cooperating agencies submit perimeters ≥10 acres. Version update: Firep24_1 was released in April 2025. Five hundred forty-eight fires from the 2024 fire season were added to the database (2 from BIA, 56 from BLM, 197 from CAL FIRE, 193 from Contract Counties, 27 from LRA, 8 from NPS, 55 from USFS and 8 from USFW). Six perimeters were added from the 2025 fire season (as a special case due to an unusual January fire siege). Five duplicate fires were removed, and the 2023 Sage was replaced with a more accurate perimeter. There were 900 perimeters that received updated attribution (705 removed “FIRE” from the end of Fire Name field and 148 replaced Complex IRWIN ID with Complex local incident number for COMPLEX_ID field). The following fires were identified as meeting our collection criteria but are not included in this version and will hopefully be added in a future update: Addie (2024-CACND-002119), Alpaugh (2024-CACND-001715), South (2024-CATIA-001375). One perimeter is missing containment date that will be updated in the next release. Cross checking CALFIRS reporting for new CAL FIRE submissions to ensure accuracy with cause class was added to the compilation process. The cause class domain description for “Powerline” was updated to “Electrical Power” to be more inclusive of cause reports. Detailed metadata is included in the following documents: Wildland Fire Perimeters (Firep24_1) Metadata For any questions, please contact the data steward: Kim Wallin, GIS Specialist CAL FIRE, Fire & Resource Assessment Program (FRAP) [e-mail]由于存在缺失的火灾边界（详见元数据中的使用限制，本数据集在用于统计分析与报告时需谨慎使用。部分火灾未被收录，原因包括历史记录遗失或损坏、规模小于最小阈值、文档记录不全，或尚未被纳入该数据库。火灾边界数据库存在的其他已知问题包括重复火灾记录与过度泛化。尤其是大型老旧火灾的过度泛化可能会将最终边界内未燃烧的“孤岛”标记为已燃烧区域。火灾边界数据库的使用者在应用该数据时需格外谨慎。谨慎使用本数据集可避免使用者从数据中得出不准确或错误的结论。由于两套数据集的要求存在差异，加利福尼亚州境内的本数据集可能与美国国家跨部门消防中心（National Interagency Fire Center, NIFC）发布的对应数据有所不同。本数据集涵盖的火灾记录可追溯至1878年。请填写以下调查反馈以协助完善本数据集：历史火灾边界数据集反馈（arcgis.com）。目前的数据收集标准如下：加利福尼亚州消防局（CAL FIRE，含签约管辖县）需提交以下火灾边界：用材林范围内≥10英亩、灌丛范围内≥50英亩、草地范围内≥300英亩的火灾边界，以及造成≥3处受影响的住宅或商业建筑、或造成≥1人死亡的火灾边界。所有合作机构需提交≥10英亩的火灾边界。版本更新：Firep24_1于2025年4月正式发布。本次数据库新增了2024年火灾季的548起火灾（2起来自美国印第安事务局（BIA）、56起来自美国土地管理局（BLM）、197起来自CAL FIRE、193起来自签约县、27起来自LRA、8起来自美国国家公园管理局（NPS）、55起来自美国林务局（USFS）、8起来自美国鱼类及野生动物管理局（USFW））。2025年火灾季新增了6处火灾边界（鉴于2025年1月发生罕见的大规模火灾事件，故作为特殊情况纳入）。移除了5起重复火灾记录，并以更精准的火灾边界替换了2023年Sage火灾的边界数据。共有900处火灾边界完成了属性信息更新（其中705处将火灾名称字段末尾的"FIRE"字样予以移除，148处将COMPLEX_ID字段中的Complex IRWIN ID替换为复杂事件本地编号）。以下符合数据收集标准但未纳入本版本的火灾包括：Addie（2024-CACND-002119）、Alpaugh（2024-CACND-001715）、South（2024-CATIA-001375），有望在未来更新中纳入。有1处火灾边界缺失围控日期，将在下一版本更新中补充完整。数据编制流程新增了针对CAL FIRE新提交数据与CALFIRS报告的交叉核查环节，以确保火灾成因分类字段的准确性。“电力线路（Powerline）”对应的成因分类域描述已更新为“电力设施”，以更全面地涵盖火灾成因上报信息。详细元数据包含于以下文档：《野外火灾边界（Firep24_1）元数据》。如有任何疑问，请联系数据管理员：Kim Wallin，地理信息系统（GIS）专员，加利福尼亚州消防局火灾与资源评估项目（Fire & Resource Assessment Program, FRAP），邮箱：[e-mail]