Nice. That’s consistent with the method used by the University of Minnesota’s Accessibility Observatory. A bit of a challenge to weight the modal travel distances,
but it should be a good approximation – certainly as good or better than a self-reported number.
From: Kim, Kyeongsu [mailto:kkim@louisberger.com]
Sent: Friday, December 02, 2016 2:58 PM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] Distance travveled to work
I agree with Steve that LODES does not provide the distance. Find the linked document for LODES. https://lehd.ces.census.gov/data/lodes/LODES7/LODESTechDoc7.2.pdf
For my previous analysis, I used the centroid of census block group (you can go down to block level) OD and estimated (transit and driving) travel time using google api.
|
lehd.ces.census.gov 2 Rev. 20160303 The geography crosswalk is a relationship file that establishes the hierarchical connection between
each 2010 census tabulation block and all higher ... |
Kyeongsu (Steve) Kim
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From:
ctpp-news-bounces@chrispy.net <ctpp-news-bounces@chrispy.net> on behalf of Steve Wilson <swilson@srfconsulting.com>
Sent: Friday, December 2, 2016 3:39:34 PM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] Distance travveled to work
I wonder if people are referring to the buffer tool available with the LEHD “On The Map” tool. That is distance, but it is not travel distance.
From: Cervenka, Kenneth (FTA) [mailto:Kenneth.Cervenka@dot.gov]
Sent: Friday, December 02, 2016 2:30 PM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] Distance travveled to work
Hello,
Both Kevin Tierney and Alex Karner are quite right about there not being a “distance” table in the ACS/CTPP files.
But now this brings up an interesting secondary question: exactly how is this being calculated in the LEHD product? Unless everyone who commutes to work drives their own car
in a mostly uncongested and non-tolled environment, this is actually a lot more complicated to “get right” than one might think, even if a road network-based find-the-minimum-path approach is used. I presume there is documentation about how the distance-based
calculations are being done (surely it is something more than a straight-line between two centroids, multiplied by a national factor to represent circuity for auto travelers, but that would be my guess), but a quick search of LEHD and LODE documents did not
reveal the answer.
Ken Cervenka
FTA Office of Planning
From:
ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Kevin Tierney
Sent: Friday, December 02, 2016 2:27 PM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] Distance travveled to work
No. Some users noted a desire for it in the recent CTPP Assessment, but others indicated they get that information from their travel models.
From:
ctpp-news-bounces@chrispy.net [mailto:ctpp-news-bounces@chrispy.net]
On Behalf Of Alex Karner
Sent: Friday, December 02, 2016 2:21 PM
To: ctpp-news@chrispy.net
Subject: Re: [CTPP] Distance travveled to work
ACS has commute time but not distance. With CTPP you can use OD flows to calculate distance using network approaches or assuming straight lines. No way to get distance directly as far as I know.
-Alex
--
Alex Karner, PhD
Assistant Professor
School of City & Regional Planning
Georgia Institute of Technology
alexkarner.com
From: Mara Kaminowitz <mkaminowitz@baltometro.org>
To: "ctpp-news@chrispy.net" <ctpp-news@chrispy.net>
Sent: Friday, December 2, 2016 2:07 PM
Subject: [CTPP] Distance travveled to work
Hello,
Is there a table in ACS or CTPP that gives the distance traveled to work? I know it's in LEHD but I'd like to pin down another source.
Mara
--
Mara Kaminowitz, GISP
GIS Coordinator
.........................................................................
Baltimore Metropolitan Council
Offices @ McHenry Row
1500 Whetstone Way
Suite 300
Baltimore, MD 21230
410-732-0500 ext. 1030
mkaminowitz@baltometro.org
www.baltometro.org
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