AndreaBozzo/ceres-open-data-index huggingface dataset:
Extreme Heat Low Emissions RCP 8.5

Data from Cal-Adapt, based on California’s 4th Climate Change Assessment. This layer shows the average 95th percentile daily maximum temperature — that is, the typical maximum temperature on the hottest days of the year — for a historical baseline period and for mid- and late-century projections under a high greenhouse gas-emissions scenario, by 6km grid cell. Air temperature measures heat within the atmosphere and is the standard metric used in weather reports that feature temperature – although air temperature is only one of several factors that affect how hot a person feels in a given place. Extreme heat data from Cal-Adapt. Includes baseline, mid-century, and late-century projections by 6km grid cell. ──────────────────────────────────┬──────────────────────────────────────────────────────────────────────── Indicator │Description ──────────────────────────────────┼──────────────────────────────────────────────────────────────────────── Extreme Heat, Baseline │95th percentile daily maximum temperature, 30-year average for 1976-2005 ──────────────────────────────────┼──────────────────────────────────────────────────────────────────────── Extreme Heat, RCP 4.5 Mid-Century │95th percentile daily maximum temperature, 30-year average for 2036-2065 ──────────────────────────────────┼──────────────────────────────────────────────────────────────────────── Extreme Heat, RCP 8.5 Mid-Century │95th percentile daily maximum temperature, 30-year average for 2036-2065 ──────────────────────────────────┼──────────────────────────────────────────────────────────────────────── Extreme Heat, RCP 4.5 Late-Century│95th percentile daily maximum temperature, 30-year average for 2066-2095 ──────────────────────────────────┼──────────────────────────────────────────────────────────────────────── Extreme Heat, RCP 8.5 Late-Century│95th percentile daily maximum temperature, 30-year average for 2066-2095 ──────────────────────────────────┴──────────────────────────────────────────────────────────────────────── Source: Cal-Adapt. Data: LOCA Downscaled CMIP5 Projections (Scripps Institution of Oceanography), Gridded Observed Meteorological Data (University of Colorado, Boulder).
Sewer & Wastewater Treatment Systems (OWTS & NOWTS)

A "conventional onsite wastewater treatment system," (OWTS) also commonly called a "conventional septic system," refers to a standard setup for treating wastewater on-site at a single residence, consisting primarily of a septic tank and a drainfield, where wastewater flows from the home into the tank, solids settle, and the partially treated liquid (effluent) then percolates through the soil in the drainfield to be further purified before release back into the environment. A "non-conventional onsite wastewater treatment system" (NOWTS) refers to a septic system that utilizes additional treatment components beyond a standard septic tank, often employing advanced technologies to further purify wastewater before it is discharged into the soil, including options like aerobic treatment units, recirculating sand filters, constructed wetlands, and evapotranspiration systems.
LA County ZIP Codes (Hosted)

Data Updated: February 24, 2026 US Postal Service ZIP Code boundaries. This layer shows parcel-based postal ZIP Code boundaries encompassing all of Los Angeles County. Sources: United States Postal Service, County of Los Angeles Office of the Assessor, County of Los Angeles Registrar-Recorder / County Clerk (RRCC) Countywide Address Management System (CAMS), U.S. Census Bureau TIGER line data, LAR-IAC digital orthographic and oblique aerial imagery, and Google Maps / Street View. Created: 2010 (created using these sources by the Los Angeles County Regional Planning, GIS Section). UPDATE HISTORY: * 7/1/2015 - changed two parcels parcels with the wrong ZIP Code * 4/20/2016 - Update between 90059 & 90262 @ Mona Blvd. (Lynwood Sheriff Station) * 6/23/2016 - Update between 90058, 90040 & 90201 @ E 52nd Dr. (90201 is now a single polygon) * 7/7/2016 - Update between 90044 & 90003 @ W. 70th St. * 7/7/2016 - Update between 90011 & 90058 on Long Beach Ave. * 7/7/2016 - Update to 90704 for both Catalina & San Clemente Islands. Area modified to mirror existing * 9/22/2021 - Update to boundary between ZIP Code 91355 and 91381 to reflect USPS changes related to Mission Village * 1/03/2022 - Update to boundary between ZIP Code 91354 and 91390 to reflect USPS changes related to Tesoro Highlands Development * 1/25/2022 - Update to various ZIP Codes (91321,91350,91351,91354,91355,91384,91387) to match USPS per DCFS notes * 09/01/2022 - Update to various ZIP Codes (91710, merged 92821 into 91748, merged 92823 into 91765) to match USPS per DCFS notes (these zipcodes are all Brea) * 11/01/2024 - Added ZIP Codes for La Habra (90631, 92835, 92821) to support address points used in EPIC LA to support LA County Fire. * 02/03/2026 - Updates to various ZIP codes (90023, 90058, 90001, 90002, 93553, 93563, 91302, 90265, 90032, 90063, 90301, 90303) to match USPS Legal vs. Postal Cities Many users confuse the name the Post Office delivers to (e.g. Van Nuys, Hollywood) as a legal city (in this case Los Angeles), when they are, in fact, a postal city. The County contains 88 legal cities, and over 400 postal names that are tied to the ZIP Codes. To support useability and geocoding, we have attached the first 3 postal cities to each address, based upon its ZIP Code. Updated by DPW-SMPM
Service Planning Areas 2022 (view)

Los Angeles County Service Planning Areas (SPAs), updated in 2022. Los Angeles County is divided into eight SPAs for health care planning purposes. Updating SPA and Health District boundaries to align with new U.S. Census Bureau census tract boundaries is performed after every Decennial Census. How was this data created? The 2020 Census Tracts from the U.S. Census Bureau's 2021 TIGER/Line were used as building blocks for the SPA layer. The 2012 SPA layer was compared to the 2020 Census Tracts to provide preliminary information on the SPAs associated with each Census Tract and to determine where SPAs no longer aligned. For the 2022 SPA layer, boundaries were updated to align with the 2020 Census Tract boundary changes with consideration for maintaining effective service delivery. The SPAs were refined to conform with the County boundary and coastline from the Supervisorial Districts 2021 and County Boundary layers. Data Fields: SPA (Type = Text, Length = 1, Alias = SPA 2022): SPA number as text; a numeric but non-quantitative identifier SPA_NAME (Type = Text, Length = 30, Alias = SPA NAME): Full SPA name ABBV (Type = Text, Length = 5): Abbreviated SPA name LABEL (Type = Text, Length = 10): Descriptive text of SPA for maps SPA_NUM (Type = Short, Alias = SPA NUM): SPA number as number; field type from earlier 2012 version of SPAs Update Frequency: After every Decennial Census or as needed
Health Districts 2022 (view)

Los Angeles County Health Districts (HDs), updated in 2022. Los Angeles County is divided into twenty-six HDs, which are subdivisions of Service Planning areas (SPAs). HDs are used for planning and managing health service delivery across Los Angeles County. Updating HD and SPA boundaries to align with new U.S. Census Bureau census tract boundaries is performed after every Decennial Census. How was this data created? The 2020 Census Tracts from the U.S. Census Bureau's 2021 TIGER/Line were used as building blocks for the HD layer. The 2012 HD layer was compared to the 2020 Census Tracts layer to provide preliminary information on the HDs associated with each Census Tract and to determine where HDs no longer aligned. For the 2022 HD layer, boundaries were updated to align with 2020 Census Tract boundary changes within their corresponding 2022 SPAs with consideration for maintaining effective service delivery. The HDs were refined to conform with the County boundary and coastline from the Supervisorial Districts 2021 and County Boundary layers. Data Fields: HD (Type = Text, Length = 2, Alias = HD 2022): Health District number as text; a numeric but non-quantitative identifier HD_NAME (Type = Text, Length = 30, Alias = HD NAME): Full Health District name SPA (Type = Text, Length = 1, Alias = SPA 2022): SPA number that HD resides within SPA_NAME (Type = Text, Length = 30, Alias SPA NAME): Full SPA name that HD resides within HD_NUM (Type = Short, Alias HD NUM): Health District number as number; field type from earlier 2012 version of HDs Update Frequency: After every Decennial Census or as needed
Social Vulnerability Index 2020

The CDC\ATSDR Social Vulnerability Index (SVI) is a tool, created by the Geospatial Research, Analysis and Services Program (GRASP), to help public health officials and emergency response planners identify and map the communities that will most likely need support before, during, and after a hazardous event. The tract-level SVI shows the relative vulnerability of the population of every Los Angeles County Census Tract. Tracts are ranked against other tracts in California. The SVI ranks tracts on 16 social factors, described in detail in the CDC\ATSDR documentation. The tract rankings for individual factors are further grouped into four related themes. Thus each enumeration unit receives a ranking for each Census variable and for each of the four themes, as well as an overall ranking. See complete documentation here: https://www.atsdr.cdc.gov/placeandhealth/svi/data_documentation_download.html. For additional questions, contact the SVI Lead at svi_coordinator@cdc.gov. How was this data created? The CSV file for California SVI was downloaded 11/28/22 from https://www.atsdr.cdc.gov/placeandhealth/svi/data_documentation_download.html. The table was joined to 2020 Census Tracts from the LA County eGIS Data Repository. Added Data Field: 1. VULNERABILITY (Level of Vulnerability): High (SVI score 0.7501 to 1), Medium to High (SVI score 0.5001 to 0.7500), Low to Medium (SVI score 0.2501 to 0.5000), Low (0 to 0.2500), No data available
LACoFD Fire History 2001-2010

LACoFD Fire History 2011-2020 - filtered to show fires greater than 20 acres. Fires that occurred within Los Angeles County Fire Department's jurisdiction including State Responsibility Area land. This dataset DOES NOT include fires in Los Angeles City Fire Department's jurisdiction. Contact Information: Los Angeles County Fire Department Geographic Information Systems Section [LACoFDGIS@fire.lacounty.gov]
Impermeable Surfaces Census Tract

Impermeable surfaces percent calculated for census tracts in Los Angeles County as of 2023. This dataset is derived from the land cover classification available at [LARIAC7/LANDCOVER_2023 (MapServer)]. The land cover classification is derived from LARIAC7 aerial imagery (2023). It contains eight land cover classes: tree canopy, grass/shrubs, tall shrubs, bare soil, water, buildings, roads/railroads, and other paved. Percent impermeable surfaces is defined as: impermeable surface acreage (buildings, roads/railroads, and other paved) divided by land acreage (non-water) times 100. This dataset was developed for the LA County Chief Sustainability Office (CSO) Climate Heat Action Plan (CHAP). Learn more about the CHAP at [County Heat Action Plan], and view data related to the plan at the [CHAP Data Viewer]. The CSA field reflects the Countywide Statistical Area (CSA) whose boundary intersects the census tract centroid.
LA County ZIP Code Boundaries (Parcel Accurate)

US Postal Service ZIP Code boundaries. This layer shows parcel-based postal ZIP Code boundaries encompassing all of Los Angeles County. Sources: United States Postal Service, County of Los Angeles Office of the Assessor, County of Los Angeles Registrar-Recorder / County Clerk (RRCC) Countywide Address Management System (CAMS), U.S. Census Bureau TIGER line data, LAR-IAC digital orthographic and oblique aerial imagery, and Google Maps / Street View. Created: 2010 (created using these sources by the Los Angeles County Regional Planning, GIS Section). UPDATE HISTORY: * 7/1/2015 - changed two parcels parcels with the wrong ZIP Code * 4/20/2016 - Update between 90059 & 90262 @ Mona Blvd. (Lynwood Sheriff Station) * 6/23/2016 - Update between 90058, 90040 & 90201 @ E 52nd Dr. (90201 is now a single polygon) * 7/7/2016 - Update between 90044 & 90003 @ W. 70th St. * 7/7/2016 - Update between 90011 & 90058 on Long Beach Ave. * 7/7/2016 - Update to 90704 for both Catalina & San Clemente Islands. Area modified to mirror existing * 9/22/2021 - Update to boundary between ZIP Code 91355 and 91381 to reflect USPS changes related to Mission Village * 1/03/2022 - Update to boundary between ZIP Code 91354 and 91390 to reflect USPS changes related to Tesoro Highlands Development * 1/25/2022 - Update to various ZIP Codes (91321,91350,91351,91354,91355,91384,91387) to match USPS per DCFS notes * 09/01/2022 - Update to various ZIP Codes (91710, merged 92821 into 91748, merged 92823 into 91765) to match USPS per DCFS notes (these zipcodes are all Brea) * 11/01/2024 - Added ZIP Codes for La Habra (90631, 92835, 92821) to support address points used in EPIC LA to support LA County Fire. * 02/03/2026 - Updates to various ZIP codes (90023, 90058, 90001, 90002, 93553, 93563, 91302, 90265, 90032, 90063, 90301, 90303) to match USPS Legal vs. Postal Cities Many users confuse the name the Post Office delivers to (e.g. Van Nuys, Hollywood) as a legal city (in this case Los Angeles), when they are, in fact, a postal city. The County contains 88 legal cities, and over 400 postal names that are tied to the ZIP Codes. To support useability and geocoding, we have attached the first 3 postal cities to each address, based upon its ZIP Code. Updated by DPW-SMPM
Public Works Road Maintenance Districts

This layer is for the Los Angeles County Public Works Road Maintenance Districts. Public Works maintains and upkeeps public roads within the unincorporated areas of Los Angeles County and for contract cities. The County is divided into 5 separate districts with each subdivided further into road districts which are responsible for maintaining the roads within unincorporated communities. If you have any questions about this layer, please contact sgutierrez@pw.lacounty.gov
2020 Census Block Groups

A Block Group usually covers a contiguous area. Each census tract contains at least one BG, and BGs are uniquely numbered within the census tract. Within the standard census geography hierarchy, BGs never cross state, county, or census tract boundaries but may cross the boundaries of any other geographic entity. There are little more number of Census Block Groups within Los Angeles County in 2020 Census TIGER/Line Shapefiles, compared in 2010. BGs are generally define to contain between 600 to 3,000 people and 240 and 1,200 housing units. BGs are the smallest geographic unit for which the Census Bureau tabulates sample data. Created/Updated: Updated on September 2023, to merged Long Beach Breakwater land-based block group silver polygons into bigger block group 9903000 as per 2022 TIGER Line Shapefiles, and to update Santa Catalina Islands and San Clemente Islands block group boundary based on DPW City boundaries (except 5990002 tract in Avalon). Updated on Sep 2022 and Dec 2022, to align tract boundary along city boundaries. Created on March 2021. How This Data is Created? This geographic file was downloaded from Census Bureau website: https://www2.census.gov/geo/tiger/TIGER2020PL/STATE/06_CALIFORNIA/06037/ on February, 2021 and customized for LA County. Data Fields: 1. BG20 (BLKGRPCE20): 7 digit census tracts and block group number, 2. CT20 (TRACTCE20): 6-digit census tract number, 3. Label (NAMELSAD20): Block group number label
2020 Census Tracts

The Census Bureau (https://www.census.gov/) maintains geographic boundaries for the analysis and mapping of demographic information across the United States. Every 10 years the Census Bureau counts the population of the United States as mandated by Constitution. The Census Bureau releases the results of this county as demographic data with geographic identifiers so that maps and analysis can be performed on the US population. There are little more Census Tracts within Los Angeles County in 2020 Census TIGER/Line Shapefiles, compared to 2010. Created/Updated: Updated on September 2023, to merged Long Beach Breakwater land-based tracts silver polygons into bigger tract 990300 as per 2022 TIGER Line Shapefiles, and to update Santa Catalina Islands and San Clemente Islands tract boundary based on DPW City boundaries (except 599000 tract in Avalon). Updated on Sep 2022 and Dec 2022, to align tract boundary along city boundaries. Created on March 2021. How was this data created? This geographic file was downloaded from Census Bureau website: https://www2.census.gov/geo/tiger/TIGER2020PL/STATE/06_CALIFORNIA/06037/on February, 2021 and customized for LA County. Data Fields: 1. CT20 (TRACTCE20): 6-digit census tract number, 2. Label (NAME20): Decimal point census tract number.
LARIAC7 Rooftop Albedo - Geographies

These layers group the 2023 building-level solar albedo (reflectance) of building rooftops to calculate average albedo values at various geographic levels in Los Angeles County. For more information on the building-level dataset and how it was created, please see: [LARIAC7 Rooftop Albedo - Buildings - Overview]. Rooftop reflectivity is an important component of determining "cool" roofs, which contribute to greater energy efficiency, lower energy consumption, and reduction of the urban heat island effect. Solar Albedo ranges from 0-1 (least to most reflective). An albedo value higher than 0.25 considered a “cool roof” for high-slope rooftops, and a value above 0.68 is considered cool for low-slope rooftops. This dataset was developed as a collaboration of the County of Los Angeles [Chief Sustainability Office] and [Enterprise GIS] teams. This layer reports average solar albedo values for the following geographies: * Census tracts 2020 (CT20) * Countywide Statistical Areas (CSA) * Service Planning Areas (SPA) * Supervisor Districts (SD) * County of Los Angeles
LARIAC7 Rooftop Albedo - Buildings

This layer visualizes the average solar albedo (reflectance) of building rooftops in LA County calculated from LARIAC7 (2023) 4-band 4-inch imagery. Rooftop reflectivity is an important component of determining "cool" roofs, which contribute to greater energy efficiency, lower energy consumption, and reduction of the urban heat island effect. Solar Albedo ranges from 0-1 (least to most reflective). An albedo value higher than 0.25 considered a “cool roof” for high-slope rooftops, and a value above 0.68 is considered cool for low-slope rooftops. Raster formula: Solar Albedo = ((0.17 * [Blue band value]) + (-0.13 * [Green band value]) + (0.33 * [Red band value]) + (0.54 * [Infrared band value])) / 255 This dataset was developed as a collaboration of the County of Los Angeles [Chief Sustainability Office] and [Enterprise GIS] teams. Data sources: * LARIAC7 imagery * Data source:[LA County Aerial 2023 Imagery - Overview] * Learn more:[LARIAC Hub Site] * LARIAC7 post-fire building outlines * Data source: [Countywide Building Outlines (2023) - Overview] (LARIAC members only) * Tree Canopy: [LARIAC7TREE_CANOPY_2023 - Overview] * LA County Parcels: [LA County Parcel Map Service - Overview] * Geographic Boundaries: * Census tracts 2020 (CT20) * Countywide Statistical Areas (CSA) * Service Planning Areas (SPA) * Supervisor Districts (SD) Processing steps: 1. Clip building outlines to exclude areas covered by tree canopy (non-tree buildings) 2. Clip LARIAC imagery to non-tree buildings 3. Use raster calculation to find reflectance value for each pixel 4. Calculate average Solar Albedo pixel value for each building 5. Overlap geographic boundaries with buildings to enable aggregation
ARDI Participatory Asset Mapping

Data from the Los Angeles County Participatory Mapping Project (October 2025), collected by the LA County Anti-Racism, Diversity, and Inclusion Initiative (ARDI) and KH Consulting Group, a research and evaluation team. The project gathered community perspectives on assets, needs, and barriers to access across seven communities of interest through 21 participatory workshops and an online survey distributed by approximately 30 partner organizations. A total of 399 unique respondents contributed, with geographic data aggregated to ZIP code level for privacy. Findings highlight disparities in resource access and the need for culturally rooted, geographically responsive service models. Communities of interest include: * AIAN (American Indian/Alaska Native) * Asian * Disabled * Immigrant * LGBTQ (Lesbian, Gay, Bisexual, Transgender, Queer or Questioning, Intersex, Asexual, and Two-Spirit Individuals) * NHPI (Native Hawaiian or Pacific Islander) * TGI (Transgender and Gender-Diverse) Source: KH Consulting Group analysis of 2025 Participatory Mapping Survey and Workshop Data developed for the LA County Anti-Racism, and Diversity, and Inclusion Initiative. Geography Source Notes: For report analysis data was joined to 2024 ZCTA(5) TIGER/Line Shapefile. ZCTA population from US Census ACS 5-year estimates, 2023. General Notes: Zeros do not indicate the lack of assets, though they do indicate the lack of an available survey participant.
Registrar Recorder Precincts

Contains precincts from the Los Angeles County Registrar-Recorder’s Office. The Registrar/Recorder uses these precincts to run elections by grouping them into election precincts, so they capture the boundaries of all voting districts in the County, including, but not limited to: LA County Supervisorial Districts US Congressional Districts State Senate and Assembly Districts Schools Districts Water and Waste Districts Others Related Information: The Voting Precinct File is less useful without the two Excel files below: [Precinct Information File Attribute Descriptions] [Precinct Information File Attribute Columns] Last Updated: December 2025
Zoned District (ZD)

Zoned Districts were established when zoning was initially created for the UNINCORPORTED areas of Los Angeles County. They served to divide the County into smaller distinct units for easier record keeping and organization. Zoned Districts remain in use to identify and track records from the earliest period, and for performing queries regarding permits and ordinances adopted over time. For a list of Zoned Districts or other information regarding these districts, please refer to Title 22 of the Los Angeles County Code [here]. LAST UPDATED: 1/22/26 for an [annexation] to the City of Lancaster, from the unincorporated community of Antelope Valley. NEED MORE FUNCTIONALITY? If you are looking for more layers or advanced tools and functionality, then try our suite of [GIS Web Mapping Applications].
Countywide Building Outlines (2020)

** [Download as File Geodatabase] The Countywide building outline dataset contains building outlines (over 3,000,000) for all buildings in Los Angeles County, including building height, and building area (also known as building footprints). This data was initially captured from stereo imagery as part of the LARIAC2 Project (2008 acquisition) and was updated as part of the LARIAC4 (2014), LARIAC5 (2017) and LARIAC6 (2020) imagery acquisition. Most of the buildings in this dataset were generated using stereo imagery. This means that the person capturing the buildings actually saw them in 3-D, and therefore was able to more accurately capture the location of the roof line, since this method eliminated the impacts of building lean (where the height of the building impacts its apparent location). Basically this is the most accurate method for capturing building outlines. In many cases the location is more accurate than our aerial photography and parcel boundaries. This file contains a file geodatabase which has two feature classes: * LARIAC6_BUILDINGS_2020 – this is the current set of buildings as of 2020 * LARIAC5_BUILDINGS_DELETED_2020 – these are the buildings from LARIAC5 that have been modified or deleted. These can be for change analysis and detection.