[CTPP] TAZs and BBSP (Block Boundary Suggestion Program)

____________________________ 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