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Population and Housing Estimates for Census Blocks: The San Diego Experience

Population and Housing Estimates for Census Blocks: The San Diego Experience. Jeff Tayman San Diego Association of Governments. Presentation Topics. Describe the San Diego Estimation System Study Comparing Two Sources of Address Data Issues in Doing Block-Level Estimates.

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Population and Housing Estimates for Census Blocks: The San Diego Experience

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  1. Population and Housing Estimates for Census Blocks: The San Diego Experience Jeff Tayman San Diego Association of Governments

  2. Presentation Topics • Describe the San Diego Estimation System • Study Comparing Two Sources of Address Data • Issues in Doing Block-Level Estimates

  3. Geographic Boundary System • Master Geographic Areas (MGRA) • Based on census blocks • Some blocks are split • Approximately 30,000 areas

  4. Information Easily Accessible • Standard Geographies • Cities • Zip Code Areas • Or Non-Standard • Radius from a Point • Buffer Area • User Defined Area

  5. Methodology and Data • Housing Unit Method • Top Down Approach • Official State Estimates • Local Housing Unit Permit Data • Assessors Parcel Data • Vacancy Rates, PPH and GQ Pop

  6. Geographic Sequence Jurisdiction EstimatesState Estimates Census Tract Estimates Local Housing Permits MGRA Estimates Assessors Parcels

  7. MGRA Estimates • Address-Level Data Sets • Assessors Parcel File • Group Quarters Facilities • Street Centerline and Address File • GIS Admatch Procedure

  8. Admatch- Assign Activities to Spatial Locations • 2142 Diamond St. • 1832 Grand Ave. • 1532 Missouri Ave. • 1190 Emerald St.

  9. Evaluation of Two Address-Level Administrative Records • Utility Meter Hook-ups • Assessors Parcel Data • Test Period 1990-1996 • Jurisdictions and Census Tracts • Use Local Permits as Standard

  10. Error in 1996 Housing StockJurisdictions

  11. Error in 1996 Housing StockCensus Tracts

  12. Error of the 1990-96 ChangeJurisdictions

  13. Error of the 1990-96 ChangeCensus Tracts

  14. Utility Hook-ups • Need 1-to-1 Match with New Units • Replacement Meters a Problem • Master Meters Need Unit Count • No Accounting for Lost Units • Not Easy to Get • Deal with multiple companies • Deregulation

  15. Assessors Parcels • Units at Address for Apartments and Condominiums an Issue • Year Built Not Precise • Determining Lost Units Difficult • Less Problems with Multiple Agencies Serving a County • Relatively Easy to Get • Private Vendors • $1,300 per year

  16. Maintaining an Up-to-Date GIS • Address Files • Misspellings, Abbreviations, Omissions • PO Boxes • Street Centerline Files • Missing streets and address ranges • Keeping it current • Registration

  17. 3rdAvenue 1510 3rd Ave Block 101 Block 102 Poorly Registered Street and Boundary Files 3rd Avenue

  18. Some Issues in Producing Very Small Area Estimates • Data Management • Temporal Consistency • Boundary Changes • Vacancy Rates and PPH • Controlling • Accuracy

  19. Population and Housing Estimates for Census Blocks: The San Diego Experience Jeff Tayman San Diego Association of Governments

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