I wanted to pass along to folks that the Census Bureau has agreed to fix at least one error that we have identified in the 2010 Census Tract Boundary file – specifically the accidental merging of 2 tract from the 2000 TIGER file (tracts 1370.00 & 8002.01) into a single tract (8002.04) in 2010. This meant the tract boundary didn’t follow the boundary of LA City, which would create problems for historic comparison, as well as jurisdictional reporting.
If you are using the Census Data, please be ready to download the data when it becomes available.
From Tim McMonagle
‘Geography Division and all the other divisions involved have agreed that this situation warrants correcting. I have restored Census Tract 137000. This tract was unchanged in your PSAP submission. CT 800204 no longer extends north of Hwy 101 and the boundary follows the city boundary. Keep in mind this change will not show up in the next release of the next public TIGER/Line files.’
Click here to see a pdf document showing the error. On the map – follow the blue lines (2010 boundaries) – you will see the “isthmus” that connects the northern portion of the white area (LA City) with the southern green portion (Calabasas).
PTI is a wonderful organization that provides access to “best practices” for technology and GIS. This is well highlighted by their GIS solutions award winners. Most of these applications solve needs in any other jurisdiction out there. One of the key drivers of collaboration within GIS is that most counties and cities use GIS for similar business flows.
I highly recommend reviewing this list to see if there are any applications that you are thinking about developing. For example, LA County has its CAMS (Countywide Address Management System) – it performs the same function as the Boston Application listed below. We in the County shouldn’t reinvent a wheel already created – I’d prefer to leverage the work these jurisdictions have already done!
Link the page (and the full description of each of the award winners): http://www.pti.org/solutions/2011/
Here is the list:
- Raleigh, NC: Implementing an Enterprise Land Records Portal:
- Scottsdale, AZ: Integrated Utility Mapping System:
- Fort Worth, TX: GIS Historic Aerial Imagery Tool
- Boston, MA: Street and Address Management:
- Fort Worth, TX : GIS Pedestrian Needs Index for Sidewalk Requests
- Guilford County, NC: Developing Parcel Map Quality Metrics
- Mesa, AZ: GIS Interactive Mapping
- Philadelphia, PA: Optimizing Traffic Signal LED Installation Using Mobile GIS Technology
- Miami-Dade County, FL: GIS Layer Verification Process
So – the number is in, and the questions (I’m sure) are on their way. The Census released population figures from the 2010 Census yesterday as part of the redistricting process yesterday!
LA County’s population increased by only 299,267 people between 2000 and 2010, from 9,519,338 to 9,818,605. Still a lot of people!
Here are a couple of initial files that were sent to me:
To get the data yourself – here is the link to the Census website: http://www.census.gov/rdo/data/2010_census_redistricting_data_pl_94-171_summary_files.html
Personally, I’ve been quoting a figure above 10 million for a while now. My assumption is that we had a bell curve – that we gained many more people until the recession, where we lost population. Anecdotally, I believe that the northern part of our County (Palmdale, Lancaster, etc) was the center of growth for a while – this is perhaps where we lost of lot of people too.
My thoughts initially are to do both a spatial and a temporal analysis – showing changes in time and space. What is the best way to do this? What would you look at?
Have fun – lots more data to come!
2010 Census TIGER/Line® 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, and Census Designated Places (CDPs). A link to and information about the shapefiles can be found at:
The shapefiles are currently available at the ftp site and should be available through the web interface soon.
Please forward this message with anyone you think would be interested.
US Census Bureau, Los Angeles Regional Census Center