Supplementing Census Data SANDAG Case Study. DEMOGRAPHIC DATA.

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Presentation transcript:

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 Buildings, not units 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

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 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

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) 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)

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

Case Study Parcel Level Dwelling Units

MGRA Geography

Irregular Geography

Transit Access

Parcel and MGRA Geography

Block Group Check

Block Counts and Land Use

Residential Buildings

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

TRANSPORTATION DATA

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

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 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

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 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

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

Case Study Auto Travel Times

Travel Time Surveys Route AMPM ObservedModeledDifference ObservedModeledDifference Calsbad-Escondido % % Chula Vista-Sorrento Mesa54 0 0% % Downtown-Sorrento Mesa % % El Cajon-Downtown % % Escondido-Calsbad % % Escondido-Downtown % % Escondido-Kearny Mesa % % MidCity-Kearny Mesa % % Mid City-Sorrento Mesa % % Oceanside-Downtown % % Rancho Bernado-Sorrento Mesa % % Sorrento Mesa-Downtown % % SanYsidro-Downtown % % Total % %

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

GPS Coverage

GPS Points

Freeway Speed Comparison

Arterial Speed Comparison

CTPP – Model Comparison -4% -11% -7%

Modeled Travel Times Minutes to CBD by Auto

CTPP Travel Times Minutes to CBD by Auto

Modeled Travel Times Minutes to Suburb by Auto

CTPP Travel Times Minutes to Suburb by Auto

Supplementing Census Data SANDAG Case Study