4 Jun
2022
4 Jun
'22
9:48 p.m.
Jim,
While the CTPP program encouraged folks to better align their block groups
with their TAZs, doing so, was not universal, and methods to do so varied.
For instance, DVRPC tried to make new block groups more similar to TAZs
(not always successfully) and others said they would just match their TAZS.
Probably what others are indicating makes sense, although I think going off
of strictly intersections of area is less desirable than perhaps weighing
by the population of component blocks when looking at demographic
information or employment of certain blocks if you have some proprietary,
point-level employment source or maybe lehd (although they add a lot of
noise for their geolocation at the block level. Still, if you have block
groups with high concentrations of employment on one side and population on
the other, using strictly area will give you a muddier result.
Ben
On Fri, Jun 3, 2022 at 6:27 PM Edward Sullivan <egads(a)epsys.com> wrote:
Using something like the MapInfo ProportionOverlap
function would allow
rollup based on proportional overlap of the TAZ and Block Group or Tract
polygons…
Edward A. Sullivan, III
Senior Technical Associate
Email: egads(a)epsys.com
Economic & Planning Systems (EPS)
1330 Broadway, Suite 450
<https://www.google.com/maps/search/1330+Broadway,+Suite+450+%0D%0AOakland,+CA+94612?entry=gmail&source=g>
Oakland, CA 94612
<https://www.google.com/maps/search/1330+Broadway,+Suite+450+%0D%0AOakland,+CA+94612?entry=gmail&source=g>
*T* 510-841-9190
http://www.epsys.com
[image: EPS_Logo_01]
*From:* Jim Hubbell [mailto:jimhubbell1975@gmail.com]
*Sent:* Friday, June 03, 2022 14:35
*To:* ctpp(a)listserv.transportation.org
*Subject:* [CTPP News] Roll up TAZs to Census Block Groups?
Hello CTPP Community,
Even though TAZs were officially retired by the Census Bureau, a lot of
folks in the transportation continue to use the geographies (especially
those from 2010). Today a colleague at StreetLight asked if it's possible
to roll up TAZs into Census Block Groups. I couldn't recall off the top of
my head whether this is possible, and if so, how to do it. It seems to me
that TAZ delineation criteria required they nest into Census Tracts, but
maybe also into Block Groups?
Any thoughts or guidance on this question would be greatly appreciated.
Thanks!
Jim Hubbell
StreetLight Data
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