For planning purposes & reference within the General Plan Update.
Countywide layer which divides the County of Los Angeles into 11 Planning Areas. These area divisions were created for the LA County Dept. of Regional Planning by the GIS Section under direction from the General Plan Development Section. Reflects the most recent changes from the […]
I was recently made aware of a couple of sites where NOAA makes data available.
West Coast Ocean Data Portal, which hosts data related to the oceans on the west coast:
If you are looking for flood zone data, you can access the information from FEMA through the FEMA GeoPlatform.
Here is a link to the home page: https://hazards.fema.gov/femaportal/wps/portal/NFHLWMS. At this site you can access the FEMA webmap to download data, and there are instructions […]
Update January 2015: This update added the new San Gabriel Mountains National Monument, as well as changes to the Wilderness areas in the monument (they are now the boundaries from the US Forest Service). There are also changes to the way that the these boundaries are represented. In the past the wilderness areas were clipped out of the […]
These districts were established when zoning was created for Los Angeles County many years ago. It was a way to break the county up into distinct areas, smaller units, for easier record keeping and organization. It is still in use to identify and keep track of those ordinances […]
Proposed Significant Ecological Areas
Proposed updates to the Significant Ecological Areas are based on aerial imagery and parcels. Please note that proposed SEAs have not been officially adopted as part of the L.A. County General Plan. For the Existing/Adopted SEAs click here.
This data depicts generalized land use classifications, each of which is intended to describe the dominant use characteristics within the area covered. Updated information regarding public parks, school sites, freeways, rail/transit lines, and other ownership-specific boundaries have been incorporated into this data. The actual use and intensity of […]
For UNINCORPORATED areas of Los Angeles County only. A Specific Plan implements the General Plan/Community Plan and is a more detailed version of the General Plan for a focused area. The Specific Plan articulates planning considerations and imposes regulations or controls. Updated 9/3/14 to add Marina Del Rey and Santa Catalina Island.
The Land […]
This is zoning for the unincorporated areas of Los Angeles County.
For more complete information, see Title 22 (Planning and Zoning) of the Los Angeles County Code, or stop by the office of the Los Angeles County Department of […]
A town council is a democratically elected form of government for small municipalities or civil parishes. A council may serve as both the representative and executive branch. Click here for more information regarding Town Councils within the unincorporated communities of Los Angeles County. Source: individual […]
This identifies areas that are presently or historically used for agricultural purposes. This information was digitized from the 1986 Antelope Valley Hazards and Resources map, and the 1980 General Plan Special Management Areas map. Source: Antelope Valley Area Plan (1986), General Plan Special Management Areas (1980).
Data can […]
I was informed that high quality boundary files for cities and special districts in Orange County are available from Orange County LAFCO’s website.
LA Times aggregates a number of datasets, along with an API for accessing them.
Of greatest interest to most folks is the LA Times Neighborhood dataset (click here to access), as well as the LA County Regions.
NOTE: This layer has been rescinded due to the update of the Santa Monica Mountains Local Coastal Program, certified by the California Coastal Commission on October 10, 2014 (a link to the resolution is here). The new Sensitive Environmental Resource Areas and other Biological […]
The community standards districts are established as supplemental districts to provide a means of implementing special development standards contained in adopted neighborhood, community, area, specific and local coastal plans within the UNINCORPORATED areas of Los Angeles County, or to provide a means of addressing special problems which are […]
Rural Outdoor Lighting District (Dark Skies)
This project is an amendment to Title 22 of the County Code, Planning and Zoning, to establish a Rural Outdoor Lighting District for areas of unincorporated Los Angeles County. The proposed Ordinance will establish the District with regulations that will conserve […]
This layer delineates ridgelines within selected CSDs whereupon restrictions are established for grading and ridgeline development. For more information on specific CSDs where these ridgelines reside, click here. Last updated 10/29/14 for updated Significant Ridgelines in newly certified Santa Monica Mountains Coastal Plan.
Data can be downloaded here:
Land Use Policy (1980 General Plan)
Referred to as the “General Plan” and encompasses the unincorporated areas (sometimes referred to as ‘islands’) not covered by a community, neighborhood or area plan. Adopted by the Board of Supervisors on November 25, 1980. Last Updated 10/29/14 for a small […]
The Fire Department’s jursidictional areas. Includes: Stations-170, Battalions-22, Divisions-9 and Regions-3. There are 199 individual polygons with 30 Stations having 2 or more discrete polygons.
Click here for Shapefiles
Orange County now has a data portal for downloading GIS data, including parcels, road lines, etc. This looks like a very nice capability. You have to register to access the data, but it’s a great step forward: Click here to access
Los Angeles County, The Works
This award winning application for iOS and DROID enables residents of Los Angeles County to interact with the Departments of Public Works, Parks and Recreation, Public Health, and Regional Planning by
Requesting facility and trail maintenance at County parks, as well as reporting […]
Substructure Maps Grid
A limited number of Substructure maps in “pdf” format are available via GIS polygons representing grids containing URL links. Across various areas of Los Angeles County, paper maps were created by the Department of Public Works (DPW) and its predecessors to show underground utilities such […]
Current data date: July 2014
Download the data
LMS_Data_20140707 – Zipped file geodatabase. Due to the length of a number of the fields, a shapefile with its 255 character limit is unable to store all of the information regarding description, hours, phone numbers, etc. This data was extracted July 7th, 2014. This is the […]
Abstract: This GIS layer was created to delineate catchment areas for Municipal Separate Storm Sewer System (MS4) outfalls under the Los Angeles County Flood Control District (LACFCD) jurisdiction pursuant to a 2012 National Pollutant Discharge Elimination System (NPDES) permit.
Description: The data is a compilation of storm drain hydrology studies completed by the […]
The city boundary lines and polygons, along with the Los Angeles County boundary, were consolidated into the City Annexations post on this portal.
Starting in September 2014, the data will be uploaded every week on Sunday with the newest revisions from the CAMS system.
Important note: This is the first output of the final data structure. In the next few weeks we will begin providing weekly updates as well as a number […]
This layer is the first draft of the linework depicting ‘Connectivity and Constriction’ within an SEA–as shown on the “SEA Connectivity and Constriction Map”. The SEA Connectivity and Constriction Areas Map is an implementing tool for the SEA Ordinance intended to assist in to preserving SEA sustainability. Certain development standards are imposed on new […]
Have you ever wanted the searches in our GIS applications to be more “Googly” – where as you type you get suggestions on the rest of the entry? I have dreamt about this. With the recent upgrade of our GIS Viewers to the newest versions of Essentials from […]
An example from Orange County
While this isn’t GIS data directly, the data available at the Traffic Data Branch website can be spatially enabled to show traffic counts at the various intersections of the State Highway System.
This data was created on April 30, 2012 to represent known disposal sites in Los Angeles County that may produce and emanate methane gas. The shapefile contains disposal sites within Los Angeles County that once accepted degradable refuse material. Information used to create this data was extracted from a […]
Sample Tract, Parcel Maps and Records of Survey
To make land records more easily available to the general public, the Los Angeles County Department of Public Works began scanning and posting thousands of documents online, free of charge.
The best method of accessing these records is via the […]
NOAA’s Bathymetry website (http://ngdc.noaa.gov/mgg/bathymetry/relief.html) has an integrated DEM and Topgraphy dataset at 10 meter resolution for download.
The Santa Monica quad (found via the NGDC bathymetry website) covers all the waters of LA County and […]
This dataset contains the boundaries of the various library systems in the County of Los Angeles.
This data is used to support the library’s assignment of billing and other codes on this website: http://gis.lacounty.gov/districtlocator
Download the data
Library_Service_Areas (zipped shapefile)
The Consolidated Sewer Maintenance District (CSMD) of Los Angeles County is administered by the County of Los Angeles Department of Public Works (DPW).
For the list of cities served, operational maps, or for more information about the CSMD, please visit the
The Los Angeles County boundary, along with the city boundary lines and polygons, were consolidated into the City Annexations post on this portal.
The file is used to generate maps for planning purposes. It is also used as a basemap for GIS web applications showing the each DCFS Regional Offices and satellite sites location. The file is geocoded based on the address locations of each DCFS Regional Offices and Site location. […]
This layer was created for retrieving the earliest recorded surveys of original Spanish and Mexican land grants (Ranchos), along with original plats of the United States Public Lands Survey System (PLSS). The URL field points to documents (PDF) on the
Significant Ecological Areas (SEA)
Significant Ecological Areas (SEA) Significant Ecological Area (SEA) means an area that is determined to possess an example of biotic resources that cumulatively represent biological diversity for the purposes of protecting biotic diversity, as part of the Los Angeles County general plan or […]
The grid that shows the zoning maps that cover the unincorporated areas of Los Angeles County. This grid follows alignment and numbering system as the Department of Public Works House Numbering Maps. This was developed as part of the Zoning Map Conversion and Integration Project (ZCIP) – 2002 […]
Sample Channels, Gravity Mains, Catch Basins, etc.
The Los Angeles County Storm Drain System is a geometric network model representing the storm drain infrastructure within Los Angeles County. The long term goal of this […]
Railroad mileposts used to report incidents and issues along railroad lines to public safety (law enforcement and fire). It includes LA County Sheriff Reporting District Numbers for each milepost.
This dataset was developed in 2006 to be added to Reporting District Maps for the LA County Sheriff, […]
Zones of required investigation for possible earthquake faulting, landslides, and liquefaction are delineated and distributed to cities, counties, and state construction agencies to help identify where higher building standards may be necessary for safe development.
Seismic Hazard Regulatory Hazard Zones Earthquake Fault Zone prevent buildings […]
The USGS supports a number of map services:
These allow you to view nationwide data from The National Map in your GIS software. To use these in ArcGIS – select Add Data button then choose GIS Server from the list, then “add ArcGIS Server”
To add the tiled map cache […]
View City Annexations Online
Online Viewer – Use this application for searching, viewing, and downloading recorded annexation maps and legal descriptions online.
Online Mobile – Using ArcGIS Online, this map is a little more smart phone friendly.
The California Ocean Protection Council, in partnership with USGS and NOAA Coastal Services Center, funded a LiDAR data collection effort along the California coast and San Francisco Bay, between 2009-2011. The data were made available last year through the
The goal of this mapping effort is to create more accurate fire hazard zone designations such that mitigation strategies are implemented in areas where hazards warrant these investments. The fire hazard zones will provide specific designation for application of defensible space and building standards consistent with known […]
The subdivision activity layer represents those areas (within unincorporated areas) with cases that are either pending, approved or recorded (within the past few years) within the Los Angeles County subdivision process. Updated 4/30/13 for an annexation in Santa Clarita (recorded 4/16/13).
Data can be […]
Office of Statewide Health Planning and Development (OSHPD) is the agency in the state of California that licenses hospitals and clinics. Every year, this office generates a list of hospitals and clinics as well as reports that are based on the information submitted by the individual facilities. Hospital Annual Disclosure […]
The Department of Health Services (DHS) provides acute and rehabilitative patient care, trains physicians and other health care clinicians, and conducts patient care-related research. DHS operates 4 hospitals, including some of the nation’s premiere academic medical centers through their affiliations with the University of […]
The Community Partners Program is a collaborative effort between the Los Angeles County Department of Health Services (DHS) and private, community-based providers (Partners) who are committed to providing quality health services in a culturally and linguistically appropriate environment to low income and uninsured communities. This program […]