The Provisional Health District Layer contains Department of Public Health Health Districts as of 2011, which are aggregates of 2010 Census Tracts. Furthermore, Health Districts comprise the building blocks of Los Angeles County Service Planning Areas (SPAs). The Provisional Health Districts were created by the Los Angeles County Department of Public Health for planning purposes and are subject to change.

Parcel shapes from the 2017 Assessor Tax Roll

Funded by the Los Angeles County Board of Supervisors, the Arts Commission administers the sponsorship of free concerts at community venues throughout Los Angeles County to provide access to quality music programming representing the diversity of County residents.

The Fire Department’s jursidictional areas. Includes: Stations-170, Battalions-22, Divisions-9 and Regions-3. There are 198 individual polygons with 30 Stations having 2 or more discrete polygons.

Park planning areas are used to assist in calculating park fees for sub dividers in accordance with Los Angeles County Code, Title 21.

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. This specific dataset provides FHSZs within SRA lands only, and represents the proposed zones, subject to changes based on local hearings. A subsequent dataset release will provide the actual adopted zones. Maps of the proposed zones in SRA 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.html

The CT00 layer contains polygons for census areas. The source for the information in this layer is the U.S. Bureau of the Census and appropriate county government agencies.
This file is extracted from the Los Angeles County Registrar/Recorder's Precinct Information File, which is designed to match the Thomas Brothers TRNL (road network) layer.
Where census boundaries are defined by streets, water, city boundaries, or other features, those arc segments are copied to the CT00 layer, so that census tracts and other layer features match perfectly.