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MAF/TIGER Accuracy Improvement Program (MTAIP) Indiana GIS 2005 Conference March 10, 2005 Indianapolis, Indiana.

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Presentation on theme: "MAF/TIGER Accuracy Improvement Program (MTAIP) Indiana GIS 2005 Conference March 10, 2005 Indianapolis, Indiana."— Presentation transcript:

1 MAF/TIGER Accuracy Improvement Program (MTAIP) Indiana GIS 2005 Conference March 10, 2005 Indianapolis, Indiana

2 What is TIGER? Topologically Integrated Geographic Encoding and Referencing TIGER Content Street centerlines and their names Lakes, streams, and their names Railroads Geographic entity boundaries, names, and codes (for governmental units, census tracts, census blocks, etc.) Housing unit locations Key geographic locations (for airports, schools, etc.) ZIP Codes and address ranges (for streets with city-style addresses). A street center-line “digital map” (geographic data base) of the entire United States, Puerto Rico, and the associated Island Areas

3 What is the MAF? Master Address File The content of the MAF is Mailing address, if one exists Descriptive address, if no mailing address is known Census geographic location Source and history data All addresses and locations MUST be kept confidential An accurate and up-to-date inventory of all known living quarters in the United States, Puerto Rico, and Associated Island areas

4 Why Realign TIGER? Support use of GPS by Census Field Staff - Ongoing Surveys (ACS, CPS, etc.) Census Improve Accuracy of Housing Unit Assignment to Correct Census Block - Goal: 99.6% geocoding accuracy of a housing unit to correct census block

5 Major MAF/TIGER Issues Location Information of Mixed/Variable Accuracy Large non-uniform differences in location accuracy exist in a relatively small area, and no detailed quality measures document the extent of street and address errors Mason Starbridge

6 Major MAF/TIGER Issues Inaccurate MAF/TIGER locations constrain efforts to exchange highly accurate location information with willing geographic partners that have GIS files – and preclude adoption as the road and boundary layers in The National Map In addition, the “home grown” MAF/TIGER processing environment makes development of Web-based review and update processes more cumbersome Roads in TIGER/housing units in MAF not in “true” geographic locations TIGER GIS

7 Major MAF/TIGER Issues Good GPS structure locations over mislocated MAF/TIGER street centerlines would put many houses on the wrong side of the street and, therefore, in the wrong census block Inaccurate locations preclude adopting GPS locational technology for the American Community Survey and the 2010 Census until MAF/TIGER has locations corrected

8 Major MAF/TIGER Issues Stream mistakenly crosses several streets to form “census blocks” that do not exist The problem is how to show the true situation correctly in the future, while maintaining an historical link to Census 2000 block numbers Kirkwall Alcorn Bayuo “Truth” Contradicts Existing Feature Topology COverup

9 MTAIP Implementation Decision was made to enlist the assistance of a contractor or a consortium of contractors to undertake MTAIP Census Bureau Harris Corporation Improves the Spatial Data base – is not directed to improve coverage issues

10 MTAIP IMPLEMENTATION Primary Strategy: Use State/Local/Tribal GIS Files (7.6 Meter Min. Spatial Accuracy Standard) Preference is to work with: states/tribes counties local governments Secondary Strategy: Where we cannot obtain a file from a gov’t, our Contractor will obtain a source for realignment (HAS): - Uses vector files as input to the realignment process Will not deal with governments Checks for available private sector GIS files Subcontracts for vectors extracted from imagery (existing or new) Subcontracts for street centerline collect using GPS Secondary Strategy: Use Highly Accurate Private-Sector GIS Files, Where Available Tertiary Strategy: Obtain Vectors using the most cost-efficient approach

11 What Will MAF/TIGER Be After Enhancement? Accurate MAF structure locations over correctly located TIGER street centerlines allow GPS devices to put field staff and houses on the correct side of the street and, therefore, in the correct census block Highly Accurate MAF/TIGER locations will foster use of GPS locational technology for the American Community Survey and the 2010 Census Before After

12 What Does the Census Bureau/ Federal Government Get? Improved address and map accuracy More effective Geographic Partnerships Major contribution to a more effective/lower cost 2010 Census, ACS, and other household survey operations Source for the National Map (Roads and Boundaries) Source for Homeland Security, Geospatial One-Stop, and the NSDI

13 Gives the Bureau the ability to more accurately collect and tabulate data for local governments (Funding $$$ are based on Population Counts) Will put the Census Bureau on the same base as the state/local/tribal GIS databases where they exist Will enable easier exchange of spatial information between state/local/tribal governments and the Census Bureau (Features and Boundaries) What Do the Locals Get?

14 MTAIP Production Schedule Initial Realignment | 250 | 600 | 610 | 700 | 690 | 383 Cumulative | 250 | 850 | 1,460 | 2,160 | 2,850 | 3,233

15 MTAIP Production Schedule Counties are scheduled in early summer each year for the next fiscal year (May/June timeframe) Schedule for the remaining counties is revised each summer Need to have all state/county/local files in house by April, 2006 Fiscal Year 2005 county workload is specified in contract

16 Digital Layers Desired Street Centerline File Hydrography Rail Features Boundaries Digital Orthos Structure Coordinates or Building Footprints Cadastral or Tax Parcels Land Use Boundaries Key Geographic Locations Natural Resource Pipelines Electric Power Transmission Lines ZIP Code Boundaries Census Statistical Entity Boundaries Emergency Service Zone Boundaries METADATA METADATA

17 Data Agreements Let me know up front about use constraints, data sharing agreements, etc. We usually always request revisions to your agreement: takes time (and patience!) Handle outside the metadata arena, please

18 Source File Evaluation Files must meet the Bureau’s 7.6 meter spatial accuracy standard File Evaluation based on 110 GPS points, CE 95 Files meeting the 7.6 meter requirement are considered for TIGER coordinate enhancement If file does not meet 7.6 meter requirement - attributes or other characteristics may be used Addresses, structure coordinates, and boundaries are evaluated separately

19 MTAIP Feedback to Source Providers Report on spatial evaluation of CL file

20 MTAIP Feedback to Source Providers 2004 TIGER/Line files-First Edition - Released January includes feature level metadata on coordinates - Second Edition 6 months later State/Local/Tribal source providers will be provided with “Local Edition” TIGER/Line File - After Public Release TIGER/Line - Will Include additional Record Types (beyond those in the 2004 T/L File) that will contain feature name and/or address range information as provided to the Census Bureau (except for single address address ranges)

21 INDIANA MTAIP Status COUNTY STATUS 7 TIGER Re-aligned TSC&L File 22 TIGER Realigned HAS 16 Local File Acquired 28 Negotiating for Acquisition 13 Local Centerline Future Availability 6 Harris-Acquired Source

22 NEXT STEPS: Maintenance Working on a plan-especially to support ACS post 2010 First-level maintenance: work with partners who provided street centerlines for the initial realignment - Preference is a single contact in state whenever possible - Census Bureau would process any updates in-house, since we would be on the same spatial database

23 Why Provide a Street Centerline File? Subsequent Census Bureau geographic products should align with street centerlines in the file provided Governments will be able to participate in future Census Bureau geographic programs using spatial data transfers: LUCA, redistricting, census tracts, CDPs, Boundary & Annexation Survey (BAS) Transfer of 2010 census geography (tracts, blocks) into state/local/tribal GIS should be easier – spatial transfer

24 Questions? Gail A. Krmenec U. S. Census Bureau Chicago Regional Office (708)


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