8 Nov
2001
8 Nov
'01
2:05 p.m.
Elizabeth and Ed-- (note, I am not posting this to the listserv, but Ed can
choose to post it if he wishes)
At the current time, I believe that with the current plans for sampling for
the ACS, it would take 5 years of accumulated data (60 months) for the
Census Bureau to release small area data. However, if the sampling rate
decreases to any large extent, it is not clear what would happen to small
area data. To clarify Ed's earlier remarks, we do not know if "small
area"
means census tract, or block group level geography. We are very concerned
about whether and how the transportation community will be able to generate
an "equivalent" to a CTPP file from the ACS, and if reporting by TAZ will be
possible or allowed.
Elaine Murakami
Federal Highway Administration
Keith Miller wrote:
According to the Census Bureau
(http://www.census.gov/Press-Release/www/2001/ntc102901.html):
"By 2004, the American Community Survey ... will produce estimates for
geographic areas and population groups of 65,000 or more, and by 2008, for
even the smallest areas and population groups in the country."
Just what "the smallest areas and populations groups" means is anyone's
guess, but it was my understanding that they're targeting the block-group
level. But as Ed pointed out, this all depends on congress and funding...
Also to address one point that Elizabeth asked in her original question,
"will the C2SS and the ACS provide transportation data at this fine a level
[block group]?" It is my understanding that the C2SS (Census 2000
Supplementary Survey) data will not be available for anything smaller than
counties or cities with more than 250,000 residents. The sample size of the
C2SS was not sufficient to support anything smaller than this. For the ACS,
see above.
------------------------------------------------------------------------
Keith Miller
Principal Planner: GIS and Modeling
North Jersey Transportation Planning Authority, Inc.
One Newark Center, 17th floor
Newark, NJ 07102
973-639-8444
kmiller(a)njtpa.org
-----Original Message-----
From: owner-ctpp-news(a)chrispy.net [mailto:owner-ctpp-news@chrispy.net]On
Behalf Of ed christopher
Sent: Wednesday, November 07, 2001 4:43 PM
To: Elizabeth Hartmann
Cc: elaine (fta) murakami; ctpp-news maillist
Subject: [CTPP] Re: Geographic coverage, C2SS & ACS