3 May
2002
3 May
'02
12:12 p.m.
The UCs and UAs are both in the UA Census 2000 TIGER/Line files. They share
the same field.
To determine if the 5-digit code is a UA or a UC, you must look at RT C and
look at RT C. Entity Type O refers to both UAs and UCs for 2000 (need to
look at those records). Note the UAUGA field. For the UA/UC, look at the
LSADC field:
Urbanized Areas
Code Description Status Title Applicability
75 urbanized area (UA) Urbanized Area urbanized area
76 urban cluster (UC) Urban Cluster urban cluster
Hope this helps. This is fully documented in the full UA Census 2000
TIGER/Line file documentation that will be available with the files.
Bob LaMacchia
-----Original Message-----
From: owner-ctpp-news(a)chrispy.net [mailto:owner-ctpp-news@chrispy.net]On
Behalf Of Chuck Purvis
Sent: Friday, May 03, 2002 12:12 PM
To: ctpp-news(a)chrispy.net
Subject: [CTPP] Urban Clusters on UA/TIGER/Line
TO: CTPP-News
This is probably a Bob LaMacchia question (Census Geography) but I'll post
it to the CTPP-News since it may be of interest to many MPOs.
Are the "Urban Cluster" boundaries included on the soon-to-be-released
UA/TIGER files?
The Bureau's web page (below) says yes, but I can't find a variable field
for urban clusters in the PDF-formatted "record layout."
http://www.census.gov/geo/www/tiger/tiger2k/ua_struc.html
Or, are urban clusters and urbanized areas use the same "UA" code on the
TIGER files? (And, if they use the same UA codes, is there any other
indicator to use to separate by UAs from my UCs? I've got 13 urbanized areas
and an additional 12 urban clusters in my region, which is manageable if I
want a manually separate urbanized area versus urban cluster GIS layers....)
(Urban clusters are smaller urban populations of 1,000-49,999 population,
and apparently > 1000 persons per square mile. They include such places as
Calistoga and Half Moon Bay in the Bay Area, and many of our California
state prisons....)
(WARNING: ESRI's web site www.geographynetwork.com DOES have TIGER 2000 data
files in SHP format, but the "urban areas" that are included on their site
are the 1990 URBANIZED AREAS, not the 2000 UAs!!! If ESRI staff are
monitoring this listserv, you may want to clarify what is currently
available, and when the 2000 UAs will be available on geographynetwork.com.)
Thanks in advance!
Chuck Purvis, MTC
***********************************************
Charles L. Purvis, AICP
Senior Transportation Planner/Analyst
Metropolitan Transportation Commission
101 Eighth Street
Oakland, CA 94607-4700
(510) 464-7731 (office)
(510) 464-7848 (fax)
www: http://www.mtc.ca.gov/
Census WWW: http://census.mtc.ca.gov/
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