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This dataset is the primary transportation layer output from the CAMS application and database. This file is a street centerline network in development by Los Angeles County to move toward a public domain street centerline and addess file. This dataset can be used for two purposes:
Geocoding addresses in LA County – this file currently geocodes > 99.5% of the addresses in our test files (5,000 out of 8 million addresses) using the County’s geocoding engines.
This last statement is important – the County splits the street names and addresses differently than most geocoders. This means that you cannot just use this dataset with the standard ESRI geocoding (US Streets) engine. You can standardize the data to resolve this, and we will be publishing the related geocoding rules and engines along with instructions on how to use them, in the near future. Please review the data fields to understand this information.
Mapping street centerlines in LA County
This file should NOT be used for:
Routing and network analysis
Jurisdiction and pavement management
History
LA County has historically licensed the Thomas Brothers Street Centerline file, and over the past 10 years has made close to 50,000 changes to that file. In order to provide better opportunities for collaboration and sharing among government entities in LA County, we have embarked upon an ambitious project to leverage the 2010 TIGER roads file as provided by the Census Bureau and upgrade it to the same spatial and attribute accuracy as the current files we use. This effort is part of the Countywide Address Management System (click the link for details). Processes The County downloaded and evaluated the 2010 TIGER file (more information on that file, including download, is at this link). The evaluation showed that the TIGER road file was the best candidate to serve as a starting point for our transition. Since that time, the County is moving down a path toward a complete transition to an updated version of that file. Here are the steps that have been completed and are anticipated.
Upgrade the geocoding accuracy to meet the current LA County street file licensed from Thomas Brothers. This has been completed by the Registrar/Recorder (RRCC) – matching rate have improved dramatically. COMPLETE
Develop a countywide street type code to reflect various street types we use. We have used various sources, including the Census CFCC and MTFCC codes to develop this coding. The final draft is here – Final Draft of Street Type Codes for CAMS (excel file)
Update the street type information to support high-quality cartography. IN PROGRESS – we have completed an automated assignment for this, but RRCC will be manually checking all street segments in the County to confirm.
Load this dataset into our currrent management system and begin continuing maintenance.
This layer contains the 2011 Official Supervisorial District Boundary for the County of Los Angeles, drawn at the parcel level, per Assessor parcels and the County Cadastral Landbase.
Supplemental Information: Adopted September 27, 2011 – Another entry on this portal includes redistricting information from the Districts’ adoption in 2011, along with boundaries drawn at the TIGER street map level.
Per Sec. 21500 of the California Elections Code, Supervisor District boundaries are adjusted following each decennial federal census.
Published in the County Code under Title 1, Chapter 1.08, boundary descriptions are based on census tracts and city boundaries at the time of adoption.
Metes and Bounds descriptions were prepared by the Department of Public Works.
2010 Census Blocks provide more information and GIS data downloads on this portal. Census tracts listed in the County Code correspond to the first six digits of the GIS attribute CTCB10.
City Boundaries and City Annexations provide current and historical legal city boundary information on this portal.