California Fire Perimeters 2021

This layer is no longer being actively maintained and will be retired by December 2024. Replacement layer here. This layer contains the fire perimeters from 2021 only, for California. Perimeters are sourced from the Fire and Resource Assessment Program (FRAP) and are updated shortly after the end of each calendar year. Information below is from the FRAP web site. About the Perimeters in this Layer Initially CAL FIRE and the USDA Forest Service jointly developed a fire perimeter GIS layer for public and private lands throughout California. The data covered the period 1950 to 2001 and included USFS wildland fires 10 acres and greater, and CAL FIRE fires 300 acres and greater. BLM and NPS joined the effort in 2002, collecting fires 10 acres and greater. Also in 2002, CAL FIRE’s criteria expanded to include timber fires 10 acres and greater in size, brush fires 50 acres and greater in size, grass fires 300 acres and greater in size, wildland fires destroying three or more structures, and wildland fires causing $300,000 or more in damage. As of 2014, the monetary requirement was dropped and the damage requirement is 3 or more habitable structures or commercial structures. In 1989, CAL FIRE units were requested to fill in gaps in their fire perimeter data as part of the California Fire Plan. FRAP provided each unit with a preliminary map of 1950-89 fire perimeters. Unit personnel also verified the pre-1989 perimeter maps to determine if any fires were missing or should be re-mapped. Each CAL FIRE Unit then generated a list of 300+ acre fires that started since 1989 using the CAL FIRE Emergency Activity Reporting System (EARS). The CAL FIRE personnel used this list to gather post-1989 perimeter maps for digitizing. The final product is a statewide GIS layer spanning the period 1950-1999. CAL FIRE has completed inventory for the majority of its historical perimeters back to 1950. BLM fire perimeters are complete from 2002 to the present. The USFS has submitted records as far back as 1878. The NPS records date to 1921. About the Program FRAP compiles fire perimeters and has established an on-going fire perimeter data capture process. CAL FIRE, the United States Forest Service Region 5, the Bureau of Land Management, and the National Park Service jointly develop the fire perimeter GIS layer for public and private lands throughout California at the end of the calendar year. Upon release, the data is current as of the last calendar year. The fire perimeter database represents the most complete digital record of fire perimeters in California. However it is still incomplete in many respects. Fire perimeter database users must exercise caution to avoid inaccurate or erroneous conclusions. For more information on potential errors and their source please review the methodology section of these pages. The fire perimeters database is an Esri ArcGIS file geodatabase with three data layers (feature classes): A layer depicting wildfire perimeters from contributing agencies current as of the previous fire year (Burn areas); A layer depicting prescribed fires supplied from contributing agencies current as of the previous fire year (Prescribed burns); A layer representing non-prescribed fire fuel reduction projects that were initially included in the database. Fuels reduction projects that are non prescribed fire are no longer included (Other burns). All three are available in this layer. Additionally, you can find related web maps, view layers set up for individual years or decades, and tile layers here. Recommended Uses There are many uses for fire perimeter data. For example, it is used on incidents to locate recently burned areas that may affect fire behavior (see map left). Other uses include: Improving fire prevention, suppression, and initial attack success. Reduce and track hazards and risks in urban interface areas. Provide information for fire ecology studies for example studying fire effects on vegetation over time. Download the Fire Perimeter GIS data here Download a statewide map of Fire Perimeters here Source: Fire and Resource Assessment Program (FRAP)本图层已不再进行主动维护，将于2024年12月正式退役，替代图层请点击此处。本图层仅包含加利福尼亚州2021年的火灾边界(fire perimeters)数据，数据源自火灾与资源评估项目(Fire and Resource Assessment Program, FRAP)，并于每公历年末后不久更新。以下信息均来自FRAP官方网站。 ### 本图层火灾边界数据说明 最初由加州消防局(CAL FIRE)与美国农业部林务局联合为加利福尼亚州全境的公共及私人土地开发了火灾边界地理信息系统(GIS)图层。该数据集覆盖1950年至2001年时段，包含美国林务局(USFS)管辖的10英亩及以上的野外火灾，以及加州消防局管辖的300英亩及以上的火灾。2002年，土地管理局(Bureau of Land Management, BLM)与国家公园管理局(National Park Service, NPS)加入该项目，纳入10英亩及以上的火灾数据。同年，加州消防局的统计标准扩展为：包含10英亩及以上的林木火灾、50英亩及以上的灌丛火灾、300英亩及以上的草地火灾，烧毁3栋及以上建筑的野外火灾，以及造成30万美元及以上经济损失的野外火灾。截至2014年，经济损失阈值被取消，仅保留烧毁3栋及以上居住建筑或商业建筑的统计要求。 1989年，作为加州消防计划的一部分，加州消防局各分局被要求补全其辖区内的火灾边界数据缺口。FRAP为各分局提供了1950年至1989年火灾边界的预绘地图，各分局人员同时对1989年前的边界地图进行核验，确认是否存在漏报火灾或需要重新测绘的区域。随后各加州消防分局通过加州消防局应急活动报告系统(Emergency Activity Reporting System, EARS)生成1989年后发生的300英亩以上火灾清单，消防人员依托该清单收集1989年后的边界地图用于数字化处理。最终产出覆盖1950年至1999年的全州GIS图层。加州消防局已完成1950年以来多数历史火灾边界的清查工作；土地管理局的火灾边界数据自2002年至今均已完整；美国林务局的记录最早可追溯至1878年；国家公园管理局的记录则始于1921年。 ### 项目概况 FRAP负责汇编火灾边界数据，并建立了持续的火灾边界数据采集流程。加州消防局、美国林务局第五区、土地管理局与国家公园管理局于每公历年末联合开发加利福尼亚州全境公共及私人土地的火灾边界GIS图层。数据发布时，其时效性截至上一个公历年度。该火灾边界数据库是加利福尼亚州现有最完整的火灾边界数字化记录，但在诸多方面仍存在缺失。数据库使用者需谨慎操作，避免得出不准确或错误的结论。如需了解潜在误差及其来源，请查阅本页面的方法学章节。 本火灾边界数据库为Esri ArcGIS文件地理数据库，包含三个数据图层(要素类)：一是展示供稿机构提供的截至上一火灾年度的野外火灾边界图层(过火区域, Burn areas)；二是展示供稿机构提供的截至上一火灾年度的计划火烧(Prescribed burns)图层；三是最初纳入数据库的非计划火烧类燃料削减项目图层，现已不再纳入非计划火烧类燃料削减项目(Other burns)。本图层包含上述全部三类数据。此外，您可在此处获取相关网页地图、按单年或年代分组的图层以及瓦片图层。 ### 推荐应用场景 火灾边界数据拥有诸多应用场景。例如，可在火灾处置现场定位近期过火区域，以评估其对火势行为的影响(详见左侧地图)。其他应用场景包括：提升火灾预防、扑救及初期控火成功率；降低并追踪城市界面区域的灾害与风险；为火灾生态学研究提供数据支持，例如长期研究火灾对植被的影响。 请点击此处下载火灾边界GIS数据，请点击此处下载全州火灾边界地图。数据来源：火灾与资源评估项目(Fire and Resource Assessment Program, FRAP)