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Updating Census Tiger Geography Creating and Maintaining a Current MCD and Municipal Ward Layer

Updating Census Tiger Geography Creating and Maintaining a Current MCD and Municipal Ward Layer. Tony J.Van Der Wielen GIS Manager Legislative Technology Services Bureau Sarah Kemp Associate Researcher UW Applied Population Laboratory.

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Updating Census Tiger Geography Creating and Maintaining a Current MCD and Municipal Ward Layer

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  1. Updating Census Tiger GeographyCreating and Maintaining a Current MCD and Municipal Ward Layer Tony J.Van Der Wielen GIS Manager Legislative Technology Services Bureau Sarah Kemp Associate Researcher UW Applied Population Laboratory

  2. The Problem: Census Municipal Boundaries are not Spatially Accurate • After modernization the spatial accuracy of TIGER line files has been updated to +/- 7.6 meter (+/- 25 feet) • In many areas the spatial accuracy of TIGER is better than +/- 5 meters. • Municipal boundaries are still inaccurate. • The Census Bureau relies on all communities to participate in the Boundary Annexation Survey (BAS) on a yearly basis to update municipal boundaries. • Local communities are the only entities that can legally update the municipal boundaries in TIGER (1,900 communities). • BAS is performed every year between January and March. • Why is this a problem? • Local, Legislative and Congressional Redistricting • Elections • These boundaries are used by Federal and State governments/programs

  3. A Possible Solution: County Consolidated BAS • County Consolidated BAS • Allows a County to legally submit all (or most) of the municipal boundaries to the Census Bureau • This can be done electronically with existing GIS files already being maintained at the county • Requires municipalities to “sign off” • Allow the Census Bureau to work with fewer government entities • Census will provided template forms and detailed instructions • August 1st Deadline for 2013 BAS • LTSB Tools and Support • WISE-LR • Data management tool to continually maintain municipal ward datasets • Statewide Municipal Ward and Municipal Boundary generation • LTSB Data Integration Tool – ArcGIS Mxd file • Tool to compare Census BAS GIS files with local datasets • Generates a change file that can be submitted directly to the Census Bureau for spatial correction of municipal boundaries • Municipal annexation processing – Will include annexation in statewide layer and will process for BAS.

  4. LTSB BAS Data Integration Tool

  5. Project Resources US Census Bureau – Boundary Annexation Survey http://www.census.gov/geo/www/bas/bashome.html Gail A. Krmenec – Supervisory Geographer 630-288-9258 Gail.a.krmenec@census.gov Legislative Technology Services Bureau http://legis.wisconsin.gov/LTSB/BAS Tony J. Van Der Wielen – GIS Manager 608-283-1817 Tony.vanderwielen@legis.wi.gov Applied Population Laboratory http://www.apl.wisc.edu/ Sarah Kemp – Associate Researcher 608-265-6189 Kemp@wisc.edu

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