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Supplementing Census Data SANDAG Case Study

Supplementing Census Data SANDAG Case Study . DEMOGRAPHIC DATA. Dwelling Unit Counts. Census (SF1) Resolution: Blocks (25,700) Property Record Files Resolution: Parcels (800,000) Aerial Photographs Resolution: Individual building Limitations: Small areas only

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Supplementing Census Data SANDAG Case Study

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  1. Supplementing Census DataSANDAG Case Study

  2. DEMOGRAPHIC DATA

  3. Dwelling Unit Counts Census (SF1) Resolution: Blocks (25,700) Property Record Files Resolution: Parcels (800,000) Aerial Photographs Resolution: Individual building Limitations: Small areas only Buildings, not units

  4. Structure Type Census (SF3) Resolution: Block groups (2,200) Limitations: Self-reported Property Record Files Resolution: Parcels (800,000) Aerial Photographs Resolution: Individual building Limitations: Small areas only Selected structure types

  5. Employment Estimates Census (CTPP) Resolution: CTPP zones (500) ES202 Files Resolution: Individual employers Limitations: Confidentiality issues Missing employers Multiple Sites Derived from Building Floor Area Resolution: Parcels (800,000)

  6. Household Income Census (SF3) Resolution: Block groups (2,200) State Income Tax Returns Resolution: Tracts (600) Limitations: Confidentiality issues Definitional differences Complex process

  7. Case StudyParcel Level Dwelling Units

  8. MGRA Geography

  9. Irregular Geography

  10. Transit Access

  11. Parcel and MGRA Geography

  12. Block Group Check

  13. Block Counts and Land Use

  14. Residential Buildings

  15. Problem Areas Census Structure types Geo-coding quality Block definitions Senior housing Property Record Files Units on public/non-taxable land Both Units under construction

  16. TRANSPORTATION DATA

  17. Number of Vehicles Census (SF3) Resolution: Block groups (2,200) Department of Motor Vehicles Resolution: Countywide Home Interview Surveys Resolution: Large summary areas Limitations: Sample bias

  18. Average Trip Length (Minutes) Census (CTPP) Resolution: CTPP zones (500) Limitations: Self-reported Speed Surveys/Transportation Models Resolution: TAZs (4,600) Home Interview Surveys Resolution: Large summary areas Limitations: Sample bias

  19. Transit Mode Shares Census (CTPP) Resolution: CTPP zones (500) Transit On-Board Surveys Resolution: Small summary areas Home Interview Surveys Resolution: Very large summary areas Limitations: Sample bias

  20. Trip Tables Census (CTPP) Resolution: CTPP zones (500) Home Interview Surveys Resolution: Very large summary areas Limitations: Sample bias

  21. Case StudyAuto Travel Times

  22. Travel Time Surveys

  23. California Statewide Travel Survey • 1,200 San Diego County Households • 180 Households with GPS-Equipped Vehicles • 1,000 GPS trips out of 4,700 total survey trips • February-October 2001 • GeoStats

  24. GPS Coverage

  25. GPS Points

  26. Freeway Speed Comparison

  27. Arterial Speed Comparison

  28. CTPP – Model Comparison -7% -4% -11%

  29. Modeled Travel Times Minutes to CBD by Auto

  30. CTPP Travel TimesMinutes to CBD by Auto

  31. Modeled Travel Times Minutes to Suburb by Auto

  32. CTPP Travel TimesMinutes to Suburb by Auto

  33. Supplementing Census DataSANDAG Case Study

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