3 Dec
1998
3 Dec
'98
8:54 a.m.
Hello out there in CTPP land, this is Dave Aultman in the Geography Division at the Census
Bureau. I am involved in both the Census 2000 Participant Statistical Areas Program and
the 2000 CTPP TAZ Update Program.
I would like to pass on some information that will clarify the situation.
1. To confirm what Phil Salopek stated, participants in the 2000 TAZ program will receive
98 TIGER/Line files (not 99 TIGER/Line files) to do the initial delineation of the 2000
TAZs. These files WILL NOT CONTAIN THE APPROVED CENSUS 2000 STATISTICAL AREAS. These
files are being created this month and next. At present the Census Bureau has received
only a handful of Census 2000 statistical area plans. It is possible that some files may
contain the approved statistical areas, but that number is very small. In almost every
county the census tracts, block groups, CDPs, and CCDs that are contained in the 2000 area
of the 98 TIGER/Line files are copies of the statistical areas used for the 1990 census,
not the approved Census 2000 statistical areas.
2. Participants in the TAZ Program will receive 1999 TIGER/Line files in November and
December 1999. These files WILL CONTAIN THE CENSUS 2000 STATISTICAL AREAS, and their 2000
TAZs. The Census Bureau is providing participants with these files to verify the capture
and insertion of their TAZs. Participant can submit changes to 1) correct errors that the
Census Bureau made, 2) make adjustments to TAZ boundaries that are affected by the changes
to political boundaries, and 3) redefine their TAZs for purposes such as conforming to the
Census 2000 statistical areas.
Participants in the Census 2000 Participant Statistical Areas Program also will receive
1999 TIGER/Line files to do essentially the same verification of their statistical area
boundaries. However, unlike the TAZ Verification, the Census Bureau WILL NOT accept
wholesale changes of their statistical areas. We will limit particpant to making only a
few changes that are not due to Census Bureau error or changes brought about by changes in
polictical boundaries.
Please contact me at (301) 457-1099 if you any questions or comments.
On 12/2/98, phillip_a_salopek wrote:
____________________________ Forward Header
>________________________________ > Subject: 2000 CTPP TAZ-UP > Author: Don
Burrell <DBURRELL(a)oki.org> at SMTP-
GATEWAY Date: 11/25/98 > 5:12 PM
> The Journey-to-work and FHWA folks are
currently >working on
a program to prepare the CTPP TAZ geography in
>advance of the census, > specifically by next summer. This is to be done >using
a program called > TAZ-UP, TIGER/Line 99 and ArcView GIS software.
Today, I shipped the results of the 2000 Census
>Statistical Areas Review > process for 2 of the Cincinnati area counties to
>the Detroit regional > office. This work, which is underway throughout >the
country, has identified
census tract and block group boundary changes to >be
used for the 2000 > census. > > Having just now put 2 + 2 together, my
question >is whether or not the Bureau > will have our new local recommendations
for >census boundary changes in the > TIGER/Line 99 file that is to be shipped to
us >for the TAZ-UP work? OKI > plans to revise many of our TAZ boundaries to
>conform to the 2000 census > geography. It would be helpful to have the 2000
>census geography shown.
Don Burrell
OH-KY-IN Regional Council of
Govmts.
_________________________________________________
___________________________
Response from P. Salopek
Don:
I could not answer this question on my own, so I >spoke with Bob LaMacchia in >
Geography Division of the Census Bureau. The >first point is that for the > TAZ-UP
program, TIGER/Line 98 will be the base, >not T/L 99. T/L 98 will NOT > include
the local recommendations for block >boundaries that you just > submitted. Bob L.
says that the verification >phase for both programs will > occur at the same time.
This means that the T/L >99 that I guess > participants in both activities will
receive to >review will contain both the > new TAZ boundaries and the new block
boundaries >(collection blocks, not > tabulation blocks). One point to remember is
>that in defining TAZs for 2000 > you will not be constrained to build them from
>blocks, since blocks won't be > defined yet. You will in fact have a wider
array >of lines/features to use > as TAZ boundaries than has been available in the
>past. We think this is an > improvement and should allow closer approximation
>to true TAZ boundaries.
--Phil
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Subject: [CTPP] TAZs and BBSP (Block Boundary >Suggestion Program)
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