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Geocoding of 2007 WMATA Rail Survey

Geocoding of 2007 WMATA Rail Survey. Travel Forecasting Subcommittee July 18, 2008 Clara Reschovsky. 2007 WMATA Rail Survey. Period of study: April 17 - June 22, 2007 Forms distributed to 1 in 3 riders Response rate – 25% Completed questionnaires – 66,321 84% home based trips.

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Geocoding of 2007 WMATA Rail Survey

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  1. Geocoding of 2007 WMATA Rail Survey Travel Forecasting Subcommittee July 18, 2008 Clara Reschovsky

  2. 2007 WMATA Rail Survey • Period of study: April 17 - June 22, 2007 • Forms distributed to 1 in 3 riders • Response rate – 25% • Completed questionnaires – 66,321 • 84% home based trips

  3. Station receiving card Origin/Destination purpose Mode of access/egress Fare type Exit Station Home Jurisdiction Home address Home Zipcode Vehicles available Federal government employee Transit benefits Data Collection • 12 Data Items

  4. Geocoding Process • Total records: 66,321 • 49,743 (69%) had some home geographic information • Data inputs: Structure number, Street name, Zip, Jurisdiction of residence • Used Navteq streets as base map • Half auto-matched • Misspellings, missing Struct. #s, missing Street types

  5. Manual Geocoding • Hired temporary geocoding clerk • fixed misspellings • used zip codes & Jurisdiction of Residence • use internet mapping services • added missing street types • added missing directionals/quadrants • quality control check for jurisdiction of residence • Matched (or marked out of the region) an additional 21,262 records

  6. Allocation Process • Step 1: Generate allocation file by creating variables for home station and mode of access to home station • Step 2: allocate records with partial addresses • Step 3: fully allocate records without address info

  7. Allocation Process: Step 2 • 2,367 records with partial address information allocated using a combination of the following variables • Street (entire street name) • Street Name (1st 4 Characters) • Residential Zip • Mode of Access to home station • Home MetroRail Station • Jurisdiction of residence

  8. Allocation Process: Step 3 • 18,527 records contained no geographic residential information • Have to allocate from fewer variables • Mode of Access to home station • Home MetroRail Station • Jurisdiction of Residence

  9. Results • Prevalence of Metro usage by TAZ

  10. Results cont’d • Prevalence of Metro usage by TAZ for area served by MetroRail

  11. Results cont’d • Prevalence of Metro usage by TAZ for riders who walk to their home station

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