The Wildland-Urban Interface (WUI) is the area where houses meet or intermingle with undeveloped wildland vegetation. This makes the WUI a focal area for human-environment conflicts such as wildland fires, habitat fragmentation, invasive species, and biodiversity decline. Using geographic information systems (GIS), we integrated U.S. Census and USGS National Land Cover Data, to map the Federal Register definition of WUI (Federal Register 66:751, 2001) for the conterminous United States from 1990-2020. These data are useful within a GIS for mapping and analysis at national, state, and local levels. Data are available as a geodatabase and include information such as housing densities for 1990, 2000, 2010, and 2020; wildland vegetation percentages for 1992, 2001, 2011, and 2019; as well as WUI classes in 1990, 2000, 2010, and 2020.This WUI feature class is separate from the WUI datasets maintained by individual forest unites, and it is not the authoritative source data of WUI for forest units. This dataset shows change over time in the WUI data up to 2020.Metadata and Downloads

Maps of California's Wildland Urban Interface (WUI) generated using the Time Step Moving Window (TSMW) method outlined in the paper "Remapping California's Wildland Urban Interface: A Property-Level Time-Space Framework, 2000-2020".

Please cite the original paper:

Berg, Aleksander K, Dylan S. Connor, Peter Kedron, and Amy E. Frazier. 2024. “Remapping California’s Wildland Urban Interface: A Property-Level Time-Space Framework, 2000–2020.” Applied Geography 167 (June): 103271. https://doi.org/10.1016/j.apgeog.2024.103271.

WUI maps were generated using Zillow ZTRAX parcel level attributes joined with FEMA USA Structures building footprints and the National Land Cover Database (NLCD).

All files are geotiff rasters with WUI areas mapped at a ~30m resolution. A raster value of null indicates not WUI, raster value of 1 indicates intermix WUI, and a raster value of 2 indicates interface WUI.

Three WUI maps were generated using structures built on of before the years indicated below:

2000 - "CA_WUI_2000.tif"

2010 - "CA_WUI_2010.tif"

2020 - "CA_WUI_2020.tif"

Acknowledgments -

We thank our reviewers and editors for helping us to improve the manuscript. We gratefully acknowledge access to the Zillow Transaction and Assessment Dataset (ZTRAX) through a data use agreement between the University of Colorado Boulder, Arizona State University, and Zillow Group, Inc. More information on accessing the data can be found at http://www.zillow.com/ztrax. The results and opinions are those of the author(s) and do not reflect the position of Zillow Group. Support by Zillow Group Inc. is acknowledged. We thank Johannes Uhl and Stefan Leyk for their great work in preparing the original dataset. For feedback and comments, we also thank Billie Lee Turner II, Sharmistha Bagchi-Sen, and participants at the 2022 Global Conference on Economic Geography, the 2022 Young Economic Geographers Network meeting, and the 2023 annual meeting of the American Association of Geographers. Funding for our work has been provided by Arizona State University's Institute of Social Science Research (ISSR) Seed Grant Initiative. Additional funding was provided through the Humans, Disasters, and the Built Environment program of the National Science Foundation, Award Number 1924670 to the University of Colorado Boulder, the Institute of Behavioral Science, Earth Lab, the Cooperative Institute for Research in Environmental Sciences, the Grand Challenge Initiative and the Innovative Seed Grant program at the University of Colorado Boulder as well as the Eunice Kennedy Shriver National Institute of Child Health & Human Development of the National Institutes of Health under Award Numbers R21 HD098717 01A1 and P2CHD066613.

Due to the mixed distribution of buildings and vegetation, wildland-urban interface (WUI) areas are characterized by complex fuel distributions and geographical environments. The behavior of wildfires occurring in the WUI often leads to severe hazards and significant damage to man-made structures. Therefore, WUI areas warrant more attention during the wildfire season. Due to the ever-changing dynamic nature of California’s population and housing, the update frequency and resolution of WUI maps that are currently used can no longer meet the needs and challenges of wildfire management and resource allocation for suppression and mitigation efforts. Recent developments in remote sensing technology and data analysis algorithms pose new opportunities for improving WUI mapping methods. WUI areas in California were directly mapped using building footprints extracted from remote sensing data by Microsoft along with the fuel vegetation cover from the LANDFIRE dataset in this study. To accommodate...

This dataset represents Wildland Urban Interface (WUI) zones within Monterey County. A WUI is the potential treatment zone in which projects could be conducted to reduce wildland fire threats to people. Data derived from the "Wildland Urban Interface (WUI) Fire Threat" GIS layer (GRID raster format) available from Cal Fire FRAP. The "WUI_area" polygon dataset is a modified version of the Wildland Urban Interface Fire Threat GIS layer prepared by Monterey County RMA, 2016.

Wildland-urban interface (WUI) maps identify areas with wildfire risk, but they are often outdated due to the lack of building data. Convolutional neural networks (CNNs) can extract building locations from remote sensing data, but their accuracy in WUI areas is unknown. Additionally, CNNs are computationally intensive and technically complex making it challenging for end-users, such as those who use or create WUI maps, to apply. We identified buildings pre- and post-wildfire and estimated building destruction for three California wildfires: Camp, Tubbs, and Woolsey. We used a CNN model from Esri to detect buildings from high-resolution imagery. This dataset represents the state-of-the-art of what is readily available for potential WUI mapping.

Link to landing page referenced by identifier. Service Protocol: Link to landing page referenced by identifier. Link Function: information-- dc:identifier.

Data as-is from SRA August 2024LRA Recommended November 2007 - December 2008FRA Adopted 2008California Fire Hazard Severity Zones (FHSZ), including both proposed Fire Hazard Severity Zones for State Responsibility Area lands and draft Very High Fire Hazard Severity Zones for Local Responsibility Area lands. Hosted on CAL FIRE Portal. SRA FHSZ adopted April 1, 2024A Fire Hazard Severity Zone (FHSZ) is a mapped area that designates zones (based on factors such as fuel, slope, and fire weather) with varying degrees of fire hazard (i.e., moderate, high, and very high). FHSZ maps evaluate wildfire hazards, which are physical conditions that create a likelihood that an area will burn over a 30- to 50-year period. They do not take into account modifications such as fuel reduction efforts.While FHSZs do not predict when or where a wildfire will occur, they do identify areas where wildfire hazards could be more severe and therefore are of greater concern. FHSZs are meant to help limit wildfire damage to structures through planning, prevention, and mitigation activities/requirements that reduce risk. The FHSZs serve several purposes: they are used to designate areas where California’s wildland urban interface building codes apply to new buildings; they can be a factor in real estate disclosure; and local governments consider fire hazard severity in the safety elements of their general plans.This service includes proposed Fire Hazard Severity Zones for State Responsibility Area lands and separate draft Very High Fire Hazard Severity Zones for Local Responsibility Area lands. Moderate, high, and very high FHSZs are found in areas where the State has financial responsibility for fire protection and prevention (SRA). Only very high FHSZs are found in Local Responsibility Areas (LRAs).This service represents the latest release of FHSZ. It will be updated when a new version is released. As of August 2018, it represents fhszl11_1 and fhszs06_3.PRC 4201 - 4204 and Govt. Code 51175-89 direct the California Department of Forestry and Fire Protection (CAL FIRE) to map areas of significant fire hazards based on fuels, terrain, weather, and other relevant factors. These zones, referred to as Fire Hazard Severity Zones (FHSZ), define the application of various mitigation strategies to reduce risk associated with wildland fires.

CAL FIRE is remapping Fire Hazard Severity Zones (FHSZ) for State Responsibility Areas (SRA) and Very High Fire Hazard Severity Zones (VHFHSZ) in Local Responsibility Areas (LRA) to provide updated map zones, based on new data, science, and technology.

This specific dataset provides DRAFT boundaries for Very High FHSZs within LRA lands. Since these zones were the result of a model that considers influence of fire behavior and embers from adjacent lands, zones for SRA and FRA lands are included to assist in understanding the hazard zoning on LRA lands.

Draft maps are available at: http://frap.cdf.ca.gov/projects/hazard/fhz.html

More information about the project can be found at: http://frap.cdf.ca.gov/projects/hazard/hazard.htmlObtain FRAP maps, data, metadata and publications on the Internet at http://frap.cdf.ca.gov For more information, contact CAL FIRE-FRAP, PO Box 944246, Sacramento, CA 94244-2460, (916) 327-3939

This Wildland-Urban Interface (WUI) hazard feature service is a subset of a statewide dataset produced by the Fire and Resource Assessment Program (FRAP) of the California Department of Forestry and Fire Protection. The Metropolitan Transportation Commission clipped the source data to the San Francisco Bay Region and removed the non-WUI hazard areas from the data. The full dataset can be downloaded from the FRAP GIS Data page.Wildland Urban Interface, Wildland Urban Intermix, and Wildfire Influence Zones developed by FRAP for the FRAP 2015 Assessment. This dataset adds housing density class (DEN4) and wildfire hazard (FHSZ) attributes to WUI12_2 - FRAP’s preliminary result in an effort to capture WUI for the 2015 Assessment.This dataset is appropriate for displaying the overall pattern of WUI development at the county level, and comparing counties in terms of development patterns. Until the dataset is refined through a field review process, it is not suited for WUI designations for individual houses or neighborhoods.This dataset is derived from several data sources, including housing density (input_lsn_HousingDensity12_2), Fire Hazard Severity Zones (FHSZ_Assessment11_1), Unimproved Parcels (input_UnimprovedParcels16_1) , and Vegetation Cover (input_FVEG15_2).Spatially accurate representation of the nexus between development and wildfire is underpinned in this dataset by the use of Landscan 2012. Assessment dataset input_lsn_HousingDensity12_2 has four housing density classes: Specifically, remote sensed night time light emissions (Conus Night) data is converted to points, summarized into projected 90m grid cells using methods guided by the West Wide Wildfire Risk Assessment Final Report - Addendum I Detailed Technical Methods, March 31, 2013. The data is then resampled to 30m for consistency with other Assessment data products.Housing Density Classes (DEN4) used in the WUI definitions:Class Definition1 - Less than one house per 20 acres2 - One house per 20 acres to one house per 5 acres3 - More than one house per 5 acres to 1 house per acre4 - More than 1 house per acreInterface (dense housing adjacent to vegetation that can burn in a wildfire):DEN4 Class 2, 3 or 4In Moderate, High, or Very High Fire Hazard Severity ZoneNot dominated by wildland vegetation (i.e., Lifeform not Herbaceous, Hardwood, Conifer or Shrub according to dataset input_FVEG15_2 )Spatially contiguous groups of 30m cells that are 10 acres and largerIntermix (housing development interspersed in an area dominated by wildland vegetation subject to wildfire):Not InterfaceDEN4 Class 2DEN4 Class 3, 4 dominated by wildland vegetationIn Moderate, High or Very High Fire Hazard Severity ZoneImproved Parcels onlySpatially contiguous groups of 30m cells 25 acres and largerWildfire Influence Zone (wildfire susceptible vegetation):Wildland vegetation up to 1.5 miles from Interface or IntermixFire Hazard Severity Zones:PRC 4201 - 4204 and Govt. Code 51175-89 direct the California Department of Forestry and Fire Protection (CAL FIRE) to map areas of significant fire hazards based on fuels, terrain, weather, and other relevant factors. These zones, referred to as Fire Hazard Severity Zones (FHSZ), define the application of various mitigation strategies to reduce risk associated with wildland fires. CAL FIRE is remapping Fire Hazard Severity Zones (FHSZ) for State Responsibility Areas (SRA) and Very High Fire Hazard Severity Zones (VHFHSZ) recommendations in Local Responsibility Areas (LRA) to provide updated map zones, based on new data, science, and technology. Offical "Maps of Fire Hazard Severity Zones in the State Responsibility Area of California" are provided as required by Public Resources Code 4201-4204 and entitled in the California Code of Regulation, Title 14, Section 1280 Fire Hazard Severity Zones, and as adopted by CAL FIRE on November 7, 2007. Maps of the adopted zones in SRA are available at the State Fire Marshal's Fire Hazard Severity Zones Maps page. More information about the project can be found at the Wildfire Hazard Real Estate Disclosure page.-----------------------------------------The Association of Bay Area Governments' Resilience Program makes this data available, along with other hazard data, in an effort to provide a one-stop-shop for local governments to access data for hazard/resilience planning. More information on the program and its work can be accessed from the Resilience Program information page.

This map includes CalVTP treatment areas and project boundaries. The web map supports the CalVTP Approved and Completed Projects (arcgis.com) application. It allows the user to see and query fuels treatment projects implemented under the California Vegetation Treatment Program (CalVTP). The CalVTP, developed by the Board of Forestry and Fire Protection (Board), is a critical component of the state’s multi-faceted strategy to address California’s wildfire crisis. The CalVTP defines the vegetation treatment activities and associated environmental protections to reduce the risk of loss of lives and property, reduce fire suppression costs, restore ecosystems, and protect natural resources as well as other assets at risk from wildfire. The CalVTP supports the use of prescribed burning, mechanical treatments, hand crews, herbicides, and prescribed herbivory as tools to reduce hazardous vegetation around communities in the Wildland-Urban Interface (WUI), to construct fuel breaks, and to restore healthy ecological fire regimes. The California Department of Forestry and Fire Protection (CAL FIRE) has the primary responsibility for implementing proposed CalVTP vegetation treatments, though many local, regional, and state agencies could also employ the CalVTP to implement vegetation treatments if their projects are within the scope of the CalVTP (see Final PEIR, Chapter 2, Program Description). The CalVTP will allow CAL FIRE, along with other agency partners, to expand their vegetation treatment activities to treat up to approximately 250,000 acres per year, contributing to the target of 500,000 annual acres of treatment on non-federal lands as expressed in Executive Order (EO) B-52-18. For more information, visit this link: https://bof.fire.ca.gov/projects-and-programs/calvtp/

This layer contains the fire perimeters from the previous calendar year, and those dating back to 1878, 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. There is also a tile cache version of this layer.About the Perimeters in this LayerInitially 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 ProgramFRAP 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;A layer depicting prescribed fires supplied from contributing agencies current as of the previous fire year;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.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 hereDownload a statewide map of Fire Perimeters hereSource: Fire and Resource Assessment Program (FRAP)

The CalVTP, developed by the Board of Forestry and Fire Protection (Board), is a critical component of the state’s multi-faceted strategy to address California’s wildfire crisis. The CalVTP defines the vegetation treatment activities and associated environmental protections to reduce the risk of loss of lives and property, reduce fire suppression costs, restore ecosystems, and protect natural resources as well as other assets at risk from wildfire. The CalVTP supports the use of prescribed burning, mechanical treatments, hand crews, herbicides, and prescribed herbivory as tools to reduce hazardous vegetation around communities in the Wildland-Urban Interface (WUI), to construct fuel breaks, and to restore healthy ecological fire regimes. The California Department of Forestry and Fire Protection (CAL FIRE) has the primary responsibility for implementing proposed CalVTP vegetation treatments, though many local, regional, and state agencies could also employ the CalVTP to implement vegetation treatments if their projects are within the scope of the CalVTP (see Final PEIR, Chapter 2, Program Description). The CalVTP will allow CAL FIRE, along with other agency partners, to expand their vegetation treatment activities to treat up to approximately 250,000 acres per year, contributing to the target of 500,000 annual acres of treatment on non-federal lands as expressed in Executive Order (EO) B-52-18.

This map is consumed by the allows the user to see and query fuels treatment projects implemented under the California Vegetation Treatment Program (CalVTP). The CalVTP, developed by the Board of Forestry and Fire Protection (Board), is a critical component of the state’s multi-faceted strategy to address California’s wildfire crisis. The CalVTP defines the vegetation treatment activities and associated environmental protections to reduce the risk of loss of lives and property, reduce fire suppression costs, restore ecosystems, and protect natural resources as well as other assets at risk from wildfire. The CalVTP supports the use of prescribed burning, mechanical treatments, hand crews, herbicides, and prescribed herbivory as tools to reduce hazardous vegetation around communities in the Wildland-Urban Interface (WUI), to construct fuel breaks, and to restore healthy ecological fire regimes. The California Department of Forestry and Fire Protection (CAL FIRE) has the primary responsibility for implementing proposed CalVTP vegetation treatments, though many local, regional, and state agencies could also employ the CalVTP to implement vegetation treatments if their projects are within the scope of the CalVTP (see Final PEIR, Chapter 2, Program Description). The CalVTP will allow CAL FIRE, along with other agency partners, to expand their vegetation treatment activities to treat up to approximately 250,000 acres per year, contributing to the target of 500,000 annual acres of treatment on non-federal lands as expressed in Executive Order (EO) B-52-18. For more information, visit this link: https://bof.fire.ca.gov/projects-and-programs/calvtp/

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 LayerInitially 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 ProgramFRAP 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 UsesThere 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 hereDownload a statewide map of Fire Perimeters hereSource: Fire and Resource Assessment Program (FRAP)

This is the Variable Constrained Areas (VCAs) in the SCAG Region developed for Connect SoCal, the 2020-2045 Regional Transportation Plan/Sustainable Communities Strategy (RTP/SCS). VCAs include Wildland-Urban Interface, Grazing Lands and Farmlands, 500 Year Flood Plains, CalFire Very High Severity Fire Risk, Natural Lands and Habitat Corridors..Wildland-Urban Interface (WUI) – Data on areas where housing and vegetation intermingle (“intermix WUI”) and areas with housing in the vicinity of contiguous wildland vegetation (“interface WUI”) were derived from the 2010 national Wildland-Urban Interface dataset developed by the SILVIS Lab at the University of Wisconsin-Madison;Grazing Lands and Farmlands within Incorporated Jurisdictions – Similar to farmlands identified in unincorporated areas, grazing lands and farmland information within incorporated areas were identified through the Farmland Mapping & Monitoring Program (FMMP) in the Division of Land Resource Protection in the California Department of Conservation, which underwent review by local jurisdictions;500 Year Flood Plains – Information on flood areas were derived from the Digital Flood Insurance Rate Map (DFIRM), obtained from Federal Emergency Management Agency (FEMA) in August 2017. The DFIRM Database is a digital version of the FEMA Flood Insurance Rate Maps (FIRM) that is designed for use with digital mapping and analysis software. The FIRM is created by FEMA for the purpose of floodplain management, mitigation, and insurance activities for the National Flood Insurance Program (NFIP), and was included for local jurisdiction review through SCAG’s Bottom-Up Local Input and Envisioning Process;CalFire Very High Severity Fire Risk (state and local) – Information on areas with very high fire hazards was derived from CalFire’s state responsibility area and local responsibility area Very High Fire Hazard Severity Zone (VHFHSZ) data, accessed by SCAG in early 2019; andNatural Lands and Habitat Corridors – Data on habitat corridors was derived from California Essential Habitat Connectivity Project, as developed by the California Department of Fish and Wildlife, which identifies large blocks of intact habitat or natural landscapes with connectivity corridors essential for local wildlife. This dataset benefits from feedback from a selection of federal, state, local, tribal, and non-governmental organizations throughout California, and was made publicly available in 2010.PLEASE NOTE this data is intended for planning purposes only, and SCAG shall incur no responsibility or liability as to the completeness, currentness, or accuracy of this information. SCAG assumes no responsibility arising from use of this information by individuals, businesses, or other public entities. The information is provided with no warranty of any kind, expressed or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose.

This layer contains the fire perimeters from the previous calendar year, and those dating back to 1878, 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. There is also a tile cache version of this layer.About the Perimeters in this LayerInitially 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 ProgramFRAP 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;A layer depicting prescribed fires supplied from contributing agencies current as of the previous fire year;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.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 hereDownload a statewide map of Fire Perimeters hereSource: Fire and Resource Assessment Program (FRAP)

This dataset includes the data used to develop Map 10 for the Connect SoCal 2024 Equity Analysis Technical Report, adopted on April 4, 2024. The dataset includes binary indicators for seven climate hazard geographies in the SCAG region based on the latest available geographic information. The nine layers were overlaid using the ArcGIS union tool with a minimum of one and a maximum of six overlapping layers in the region. The climate hazard layers include: flooding, landslides, sea-level rise, extreme heat, wildfires, drought, and earthquake hazard zones. This dataset was prepared to share more information from the maps in Connect SoCal 2024 Equity Analysis Technical Report. To reduce the loading time for the complex geometry of this layer, the vertices were simplified with a tolerance of 1 foot. For more details on the methodology, please see the methodology section(s) of the Equity Analysis Technical Report: https://scag.ca.gov/sites/main/files/file-attachments/23-2987-tr-equity-analysis-final-040424.pdf?1712261887 For more details about SCAG's models, or to request model data, please see SCAG's website: https://scag.ca.gov/data-services-requestsClimate Hazard Source Details:Flood: 100-year and 500-year flood areas from Federal Emergency Management Agency (FEMA); 2017Landslide: Landslide zones from California Geological Survey (CGS), California Department of Conservation; California Department of Conservation, California Geological Survey Geologic Maps, Accessed June 2023Sea-level rise: areas vulnerable to 1 meter of sea-level rise from the Coastal Storm Modeling System (CoSMoS), U.S. Geological Survey (USGS); Coastal Storm Modeling System (CoSMoS) for Southern California, v3.0, Phase 2, 2018, USGSWildfire: Local Responsibility Areas and State Responsibility Areas that are moderate, high, and very high risk of wildfires from CalFire; Fire Hazard Severity Zones Local Responsibility Areas Maps, 2007/2008, Wildland Urban Interface, 2020, CAL FIIREExtreme heat: areas that are projected to experience more than two heat health events from 2031 to 2050 from the California Heat Assessment Tool, California Natural Resources Agency, Accessed June 2023Drought: areas that experienced severe, extreme, or exceptional drought during September 2014 from U.S. Drought Monitor, Accessed June 2023Earthquake: Alquist-Priolo Earthquake Fault Zones from the California Geological Survey (CGS), California Department of ConservationSubstandard Housing: Housing units without plumbing facilities, U.S. Census Bureau American Communities Survey 5-year estimates 2017-2021

The Plan Bay Area 2050 Growth Geographies were adopted by the Metropolitan Transportation Commission and Association of Bay Area Governments Executive Board in September 2020. These conceptual areas, which do not supersede local zoning control, are prioritized for new housing and jobs in the Plan Bay Area 2050 Final Blueprint, with specific density and land use assumptions based upon adopted Final Blueprint Strategies. The applicability of different Growth Geographies varies by local jurisdiction based upon the extent to which a jurisdiction has nominated Priority Development Areas, as shown below:All JurisdictionsPriority Development Areas (PDAs):Source - features are from Priority Development Areas (Plan Bay Area 2050).Processing for growth geographies - features from source data were not modified further. Source data is the same as what is in the growth geographies data.Priority Production Areas (PPAs):Source - features are from Priority Production Areas (Plan Bay Area 2050).Processing for growth geographies - features from source data were not modified further. Source data is the same as what is in the growth geographies data.Transit Rich Areas (partial):Source - features are portions of Transit Rich Areas that are within ½ mile of a regional rail station with headways of 15 minutes or better during the AM (6 AM to 10 AM) and PM (3 PM to 7 PM) peak periods, based on posted schedules in January 2020 or service enhancements in Plan Bay Area 2050, including Bay Area Rapid Transit (BART) and Caltrain Baby Bullet station areas. (Note: regional passenger rail systems include Altamont Commuter Express, BART, Caltrain, Sonoma-Marin Area Rail Transit, and Capitol Corridor, but only BART and Caltrain include stops meeting the headway standard.)Processing for growth geographies - these input features were temporary data used to determine the designation, and were clipped to the “exclusion areas” shown below as well as PDAs and PPAs, so were not modified beyond their production.Jurisdictions That Have Nominated Less Than 50 Percent of Their PDA Eligible Areas as PDAsTransit Rich Areas (partial):Source - features are portions of Transit Rich Areas that are not within a PDA, PPA, or within ½ mile of a regional rail station with 15 minute peak headways or less, as identified above. These Transit Rich Areas features include both High Resource Areas and places outside High Resource Areas. The features for this portion of Transit Rich Areas were created by placing a half-mile buffer around passenger rail stations, ferry terminals, and bus stops on routes with peak headways of 15 minutes or less during peak commute period that were selected from Major Transit Stops (2017) data, and by placing a half-mile buffer around passenger rail stations, ferry terminals, and bus rapid transit routes included in Plan Bay Area 2050.Processing for growth geographies - These input features were temporary data used to determine the designation, and were clipped to the “exclusion areas” shown below as well as PDAs and PPAs, so were not modified beyond their production.High Resource Areas:Source - features were created by selecting the intersection of High and Highest Resource Areas from CTCAC/HCD Resource Opportunity Areas (2020) data and a ¼ mile buffer around bus stops with peak headways of 16 to 30 minutes, based upon a January 2020 extract of the Google Transit Feed Specification for all Bay Area transit providers, supplemented by published bus schedules where necessary.Processing for growth geographies - these input features were temporary data used to determine the designation, and are outside the Growth Geographies highlighted above (PDAs, PPAs, and Transit Rich Areas), as well as the “exclusion areas” shown below, so were not modified beyond their production.Exclusion AreasThe following areas are excluded from Growth Geographies. Also, these areas were not used in calculating the share of a jurisdiction’s PDA-eligible land locally nominated.County-adopted wildland urban interface areas, where available,Areas of unmitigated sea level rise (i.e., areas at risk from sea level rise through year 2050 that lack mitigation strategies in Plan Bay Area 2050 Environment Element),Areas outside locally-adopted urban growth boundaries, andParkland and other open spaces within urbanized areas identified in the California Protected Areas Database.A complete description of how the Plan Bay Area 2050 Growth Geographies were developed can be found on the Plan Bay Area 2050 Growth Framework Mapping and Analysis page on GitHub.