20 Nov
2021
20 Nov
'21
1:51 p.m.
Hey Mike-With you in Sacramento you are easily within shouting distance
of our upcoming CTPP Conference in Reno June 7-9, 2022.
https://ctpp.transportation.org/upcoming-events/. In fact the deadline
for abstracts was just extended to December 17th. If you look into the
abstract call you will see it asks for "Software applications to be
demonstrated (~ eight minutes repeated several times)", along with
papers, posters and workshops. Chuck is on the planning committee so I
suspect he'll be there and hopefully some of the other CTPP/UTPP relics.
Thinking of which, I still talk about some of the Comsis work you all
did. Makes for some good trivia...
And yes, PUMAs and PUMA definition is a big deal especially for the
larger MPOs and State DOTs. Although we are in the middle of the PUMA
definition process, it behooves the MPOs and state DOTS to make sure
they have geography/data that works for them and figure out how to belly
up to the PUMA definition table in their state ASAP.
On 11/20/2021 4:02 AM, Michael Clarke wrote:
Hi Chuck!
Hope you are well! I was surprised, and pleased, to see you are still
working on census data
We sold Citilabs to Bentley 2 years ago. Victor just retired and is
living in Seattle and I’m going to work a while longer and am now
based in Sacramento
Best
Michael
--
Ed Christopher
Transportation Planning Consultant
708-269-5237
On Nov 19, 2021, at 7:39 PM, Charles Purvis
<clpurvis(a)att.net> wrote:
/WARNING: This email originated from outside of the organization. DO
NOT click links, open attachments, or respond unless you recognize
the sender and know the content is safe./
------------------------------------------------------------------------
We’re in the middle of a 90 day period to delineate new, Census
2020-based PUMAs (Public Use Microdata Areas) (November 2021 -
January 2022).
PUMAs are used not only in Census Bureau PUMS (Public Use Microdata
Sample data); but in standard tabulations (1-year, 5-year) of
American Community Survey (ACS) data.
This PUMA development process is basically of interest to MPOs, State
DOTs, academics and researchers of area with counties greater than
200,000 population (potentially splittable counties).
Read more about the PUMA process here:
https://www.census.gov/programs-surveys/geography/guidance/geo-areas/pumas/…
<https://urldefense.com/v3/__https://www.census.gov/programs-surveys/geography/guidance/geo-areas/pumas/2020pumas.html__;!!F1Q1IbZmrAg!V0xj2Jug2w6LEHq1Ha3H2ja4S44Oi3RosjpMydxhs_RipK7hYzzq0UJjkzZO4Y05SDPr$>
The Census Bureau process focuses on the use of the free GIS system
QGIS and the free add-on GUPS (Geographic Update Partnership
Software) to prepare new PUMAs. Read through this carefully, but
understand that the MPO staff don’t necessarily need to use QGIS +
GUPS to prepare the tract-to-PUMA equivalency files. This CAN be done
in other software (ArcGIS?) and then transmitted to your State Data
Center so they can do the necessary edit checks and transmittal of
final statewide proposals to the Census Bureau. Recommendation: work
with your State Data Center on how to transmit the necessary
tract-to-PUMA equivalency files.
For the San Francisco Bay Area, I used both R and QGIS for this
process. Both R (using R Studio software) and QGIS are free — in my
price range!
Attached is my R script which was used to obtain tract-level data
using the TIDYCENSUS package; place-level data using TIDYCENSUS; and
old Census 2010-based PUMAs using the TIGRIS package. I had to use
the SF package (simple feature) to do some basic GIS processes in R,
before I exported relevant SHP files that I could use in QGIS. Use
ArcGIS or other GIS packages, of course.
I was able to expand the number of PUMAs in the nine-county San
Francisco Bay Area (population=7.765 million) from 55 PUMAs (2010
Census) to 63 PUMAs (2020 Census). And we should have plenty of time
to debate and deliberate in our local community (counties, cities,
transit operators, academics, PUMA/PUMS users) before handing
proposals over to the State Data Census & the Census Bureau.
Hope this helps!
Chuck Purvis
Hayward, California
------------------------------------------------------------------------
This email, including any attachments, may contain confidential and/or
proprietary information intended only for the use of the recipient. If
you are not the intended recipient, any distribution, copying, or use
of this email or its attachments is prohibited. If you received this
email in error, please reply to the sender immediately and delete this
message and any copies.
/Bentley Systems has taken all reasonable steps to ensure that this
communication is free from viruses, data corruption, and unauthorized
alteration. Bentley Systems does not accept liability for any damages
that may be incurred as a result of this or any communication by email/
_______________________________________________
CTPP mailing list --ctpp(a)listserv.transportation.org
To unsubscribe send an email toctpp-leave(a)listserv.transportation.org