June 2019
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How should the County license its free GIS data?

Open Data License

This has been in the back of my mind for a while, so I thought I’d get opinions on what we should do with the GIS data that we create and share. What I am trying to avoid is a reseller packaging and re-selling our GIS data without:


Diamond Bar residents to vote on ZIP code change

ZIP codes are a rather important layer to maintain. LA County has developed a parcel specific ZIP code layer that can be accessed here: http://egis3.lacounty.gov/dataportal/index.php/2011/01/24/zip-codes-with-parcel-specific-boundaries/ With the recent changes to our supervisorial district boundaries, GIS is being leveraged to update a ZIP code to Supervisorial District Boundary correlation table. It’s turning out to be […]

Good article about updating 911 systems with better data

The County began maintaining its own GIS address data back in 2000. In its current iteration, the system to maintain it, the Countywide Address Management System (CAMS). has managed to achieve very good accuracy rates of over 99% of source data, but as the article forwarded to me from Glendale shows, I am thinking that […]

GIS Data for 2011 Supervisorial District Boundaries (Adopted September 27, 2011)

2011 District Boundaries

Please note that this boundary is not yet effective – this is for reference and planning purposes only until it takes effect on October 27th, 2011.

The Board of Supervisors adopted a set of new Supervisorial Districts yesterday (September 27, 2011). I have loaded this data into the […]

eGIS Data Map for LA County

Snapshot of the Data Map

UPDATE: Thanks to Vijay from DHS – he was able to reduce the size to 14 Mb.

I showed this poster yesterday at our eGIS Meeting, and wanted to pass along. I think it shows in a very intuitive way the focus for our Countywide Enterprise […]

NAIP 2010 aerial imagery services

NAIP 2010 aerial imagery services (web mapping services) are now offered by the California Department of Fish and Game (DFG). The services are public and can be used to easily view the statewide USDA NAIP 2010 1-meter resolution imagery that was flown last summer.


Orange County Parcel Database Exempt from Public Records Act

There are a couple of different verdicts on this, but where Santa Clara used a security argument and lost, Orange County used a “GIS is a system” argument and won.

It’s a dilemma in general – how do governments recoup the costs for the maintenance of valuable data like parcels. Do we charge for them, […]

ESRI launches GovMaps.org

Nick Franchino passed along links to this today.

Click for larger view

Today, Esri president Jack Dangermond announced the new website GovMaps.org during the plenary session of the Esri Federal User Conference in Washington, D.C. The prototype site offers a customized view into commonly used nationwide layers and […]

Release of 2010 Census TIGER/Line Shapefiles for California

2010 Census TIGER/LineĀ® Shapefiles

The 2010 Census TIGER/Line Shapefiles for California are available for downloading on the Census Bureau homepage. These are the Redistricting (P.L. 94-171) TIGER/Line Shapefiles. These files include the first release of the 2010 Tabulation Geography which includes the new tabulation blocks and any changes to Block Group, Census Tracts, […]

Download LA County GIS Data

The #1 search on this site is for GIS Data. I finally had the time to put together a list of LA County’s data download sites:

LA County has a number of GIS Data locations where you can look through the County’s GIS Data, download shapefiles and various other GIS formats. Some of the data […]