Not in Montgomery county, where more than are reported work within the county alone. This visualization reports 250,295 total resident workers, the 2009 – 2013 ACS reports 519,287, of which ~310,000 stay in the county and another ~160,000 work in the three nearest (well within 293 miles) counties/county equivalents (DC).  So, I think it can’t be that.

That logic does hold in less dense areas.  A random check of Alabama counties yields the same error.  Maybe this is LEHD/LODES data?  It is notoriously missing workers… (But even LODES shows 432,000 workers for Montgomery county, MD).

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Marchwinski, Thomas
Sent: Thursday, May 26, 2016 10:26 AM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] CTPP animation map (Not CTPP, actually)

They may only be mapping those flows that have enough records so there is not an imputed or  suppressed O-D pair, which would mean sometimes up to 50% of the records do not have flows, so its missing half of the flows.  Those show up as 0 workers due to suppression. Tom Marchwinski

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Weinberger Penelope
Sent: Thursday, May 26, 2016 10:12 AM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] CTPP animation map (Not CTPP, actually)

I would be cautious, just did a quick check, it says ACS, but unsourced as to what ACS (I’m guessing 2009 – 2013 county to county flows – otherwise OD pairs are very tricky), also looking at just Montgomery county and DC, and expanding the tool to its maximum range (zero to 293 miles) it’s missing about half the total workers in each of those. Also, tracts are referenced, but that set is not reported at tract.  I welcome your thoughts.

Penelope Z. Weinberger

CTPP Program Manager

AASHTO

202-624-3556

ctpp.transportation.org

From: ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Nancy Reger
Sent: Wednesday, May 25, 2016 4:08 PM
To: ctpp-news@chrispy.net
Subject: [CTPP] CTPP animation map

Check out this CTPP animation map – we didn’t make it. It’s very cool, wish we had-

http://bigbytes.mobyus.com/commute.aspx

Nancy Reger, AICP

Director, Data & Mapping | Mid-Ohio Regional Planning Commission
T: 614.233.4154 | M: 614.228.2663 | nreger@morpc.org

111 Liberty Street, Suite 100 | Columbus, OH 43215