RE: [CTPP] Census Geography Question

We've had the same problem- had the same problem in 2000 with changes from the 1990 block too. Sometimes for file with varying polygonal boundaries (TAZ adjustments, block groups, etc), but we've intersected geographies and generated what I call a "pieces-parts file" that has a ton of little parts, and then use the proportion of these new polygons to reallocate data among them and then recompile them. It's not the best way to do things obviously since the data are not really uniformly distributed, but it isolates the ones that are different so you have a smaller set that needs further investigation. Nancy Nancy Reger, AICP Deputy Director, Transportation MORPC 111 Liberty St. Ste. 100 Columbus, Ohio 43215 nreger(a)morpc.org 614-233-4154 -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces@chrispy.net] On Behalf Of Erlbaum, Nathan (DOT) Sent: Wednesday, December 07, 2011 8:16 AM To: ctpp-news(a)chrispy.net Subject: RE: [CTPP] Census Geography Question We tried this in an attempt to estimate 2010 fhwa adj urban boundary pop based on 2000 fhwa urban boundary and pl dataand we had great difficulty resolving slivers and the cartographic quality differences between the 2000 and 2010 geography files Nathan Erlbaum Associate Transportation Analyst Office of Policy, Planning & Performance New York State Department of Transportation 50 Wolf Road, 6th Floor Albany, New York 12232 (Tel) 518.457.2967 (Fax) 518.457.4944 (E-mail) nerlbaum(a)dot.state.ny.us (Web) www.nysdot.gov ________________________________________ From: ctpp-news-bounces(a)chrispy.net [ctpp-news-bounces(a)chrispy.net] On Behalf Of Ed Christopher [edc(a)berwyned.com] Sent: Tuesday, December 06, 2011 7:44 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] Census Geography Question Today i got this question from an MPO friend of mine and was hoping others on the list could help me. Anyone experiencing similar issues. ------------- Ed We have experienced the frustration of block boundaries between the 2000 Census and the 2010 Census being dramatically different within our urbanized area. Our GIS experts have had a difficult time assembling and reconciling the differences in order for us to simply compare data on a block-by block basis. Do you know if this is unique to us or are we in the same boat as others? -- Ed Christopher FHWA Resource Center Planning Team 4749 Lincoln Mall Drive, Suite 600 Matteson, IL 60443 708-283-3534 (V) 708-574-8131 (C) _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news