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October 11, 2010
Our First Transit Equity Results
Patience, there's going to be a little bit of detail here...
We have completed our first full (and raw and tentative) data set for the equity project. We have accumulated transit scores for over 12,000 points in the three-county area.
I decided for the sake of completeness to include all census tracts that include some portion of the TriMet service district. This is includes a tract that has a few bus stops in Estacada and a whole bunch of the Mt. Hood National Forest. There are several of these large, mostly outside, tracts, so in fact about a quarter of the sampled points have a zero transit score.
This should get sorted out when we shift to block group level data.
But we now have a complete map (yes, there is indeed a donut hole in the service district near Happy Valley):
A more useful map is this browsable one (I'm learning about the ways to load KML, but don't understand them all yet!). If you click on a tract, you'll get a bubble with the tract ID and the score. Click on the tract ID and you'll launch a new map with just that tract and our sample points for the tract. You can click on those to get the scores at those points.
So that you can fully look over our shoulder, all the data for this data set (I'm calling it our October 2010 set) can be found here:
http://www.equity.portlandtransport.com/data/2010_10/
In addition to the Census shapefiles we used, you'll also find these items:
- CSV (comma-separated value - easy to open in Excel) file with all the scored points
- CSV with all the tract scores
- The KML (Keyhole Markup Language - used by Google Maps and Google Earth) mapping the tracts, coloring them by their score
Tomorrow In a few days we'll start looking at matching this up with some demographics.
Posted by Chris Smith at 12:43 AM
Comments
October 11, 2010 3:35 PM
Cameron Johnson Says:
...Where's the Like Button? XD
October 13, 2010 12:39 AM
max ogden Says:
awesome work, chris!
do you know what EPSG projection the census tracts shapefiles are in, by chance?
October 13, 2010 12:55 AM
Chris Smith Says:
Sorry, Max, I'm afraid I don't...
