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 as cable TV, gas, [...]
The Land Types dataset is a public domain dataset managed by the County of Los Angeles which includes various types of land use that are critical for mapmaking and geographic analysis. The data has been created to match parcel boundaries where possible, and digitized from 4-inch aerial photography where more detail was needed.
Current date: July [...]
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 public [...]
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 [...]
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 Regional Planning, Room 1360 Hall of Records, [...]
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 development that may be [...]
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 and for running queries [...]
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 energy and resources and [...]
We have decided that we should not post the County of Los Angeles Fire Department’s version of SRA. We do some tweaking that makes it incompatable with the state. So here is a link to the State of California’s version which is the legal one. http://frap.fire.ca.gov/projects/sra_mapping/index.php
How polluted is your neighborhood?
The California Office of Environmental Health Hazard Assessment (OEHHA), on behalf of the California Environmental Protection Agency (CalEPA), provides CalEnviroScreen 2.0, a screening methodology that can be used to help identify communities that are disproportionately burdened by multiple sources of pollution.
To access these GIS applications, downloadable GIS [...]
City Boundary Polygons and Lines
The Los Angeles County Department of Public Works provides the most current shapefiles representing city boundaries within Los Angeles County, and the shapefiles available in this download includes polygons and lines.
Visit the City Annexations page (see below) to download recently annexed [...]
Current data date: June 2014
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 of related symbolization files.
Click here to download the current dataset (zipped shapefile format) Related layer files for [...]
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 [...]
Adding the Median Income Chart
I posted yesterday about a major speed enhancement just released with the upgrade of Geocortex Essentials that was completed last week - Googly Search.
Here is another big addition that we are leveraging – CHARTS!
A few years ago the ESRI flex viewer had some pretty cool chart [...]
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 Latitude Geographics (
fires1965-2013Updated Fire Perimeters 1965-2013
Our Mapping Unit collects all the perimeter data from field personnel during a major fire.
We have a pair of instructional videos for the LA County GIS Data Portal that will help you make better use of the data available on this site. The first video shows you how to find and download GIS data from our site, while the second shows you how to use free software [...]
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.
Data available include:
Traffic Counts 2011 Annual Average Daily Traffic [...]
Data Licensed from US Data Depot showing the location, type, size, and other attributes for over 720,000 businesses in Los Angeles County. This data is for internal County use only and cannot be provided to external agencies. Pricing for this data is available at the US Data Depot [...]
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 12/11/13 for a missed Plan Amendment in West [...]
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.
From the Los Angeles County Draft General Plan [...]
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 landfill survey performed by [...]
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 is available in two different vertical datums:
http://www.ngdc.noaa.gov/dem/squareCellGrid/download/663 http://www.ngdc.noaa.gov/dem/squareCellGrid/download/726 [...]
This Tuesday, December 3rd, the LA County Board of Supervisors approved the contract with Pictometry International Corp to acquire digital aerial imagery and QAQC services – collectively known as LARIAC4.
Link to the Board Agenda (LARIAC4 is item 15) Link to the Approved contract
As the project director, I [...]
This dataset contains the boundaries of the Public Land Survey System (PLSS) - Township Range Section boundaries, as well as the boundaries of the Ranchos and Landgrants that pre-dated the PLSS. In general these match the USGS topographic Quad Sheets from the US Geological Survey.
Note – some [...]
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 Los Angeles County Sewer Maintenance home page.
In 2012, the Los Angeles County Seamless Cadastral Landbase became online and is now jointly maintained by the Assessor and the Department of Public Works.
This layer was created from county boundary line elements in the Los Angeles County Cadastral Landbase. The coastline was digitized per LARIAC imagery.
Because this layer is [...]
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. [...]
The file is used to generate maps for planning purposes. [...]
The file is used to generate maps and statistical reports for planning purposes. It is also used as a basemap for GIS web applications showing the Service Areas of each DCFS Regional Offices by ZIP Codes. [...]
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 Land Records Information website, hosted by the [...]
After 11 years in the County, and many years dealing with addresses, I just learned about our Unified House Numbering System guidelines, which points to all of the relevant source information that we use to assign house numbers in the Unincorporated portion of the county. Many cities were incorporated after this was adopted in the [...]
Established in 2005, the Los Angeles Region Imagery Acquisition Consortium (LAR-IAC) has delivered highly accurate digital aerial imagery and elevation datasets to participants at substantial cost savings. To ensure the currency of the aerial imagery, we are working with consortia members to plan and initiate the next round of LAR-IAC – LAR-IAC4.
This attached letter [...]
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 city’s general plan. [...]
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 to 2006.
UPDATED on [...]
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 network is to seamlessly integrate the countywide drainage [...]
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, who [...]
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 for human occupancy from being constructed [...]
Fire station locations for the County of Los Angeles Fire Department.
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 (these are background topographic [...]
Portion of Countywide City Annexation Data
This layer contains information for locating past and present legal city boundaries within Los Angeles County. Use your GIS software or the applications below for online viewing of original maps and legal descriptions of territories annexed.
Annexation No. 2011-07 to [...]
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 NOAA Coastal Service Center’s Digital Coast Data Access Viewer.
The entire LiDAR [...]
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 6/3/13–the Universal Studios Specific Plan was added. Marina del Rey to be added [...]
May 29th, 2013
There are a number of sources of bike path data out there. We are working to combine them into a single authoritative data source, but in the meantime here are a few links to data you can access right now.
Metro’s Bike Paths: http://developer.metro.net/introduction/bikeways-data/download-bikeways-data/ KMZ format only.
Various cities have [...]
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 mechanisms of fire risk [...]
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 downloaded here:
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 Report and Hospital Annual [...]
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 Southern California School of [...]