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TAZ/TAD delineation program overview

TAZ/TAD delineation program overview. Overview. Traffic Analysis Zone (TAZ) and Traffic Analysis District (TAD) delineation criteria and guidelines Why define them? What are they? Criteria and guidelines How the criteria and guidelines are built into rules and checks in the MTPS

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TAZ/TAD delineation program overview

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  1. TAZ/TAD delineation program overview

  2. Overview • Traffic Analysis Zone (TAZ) and Traffic Analysis District (TAD) delineation criteria and guidelines • Why define them? What are they? • Criteria and guidelines • How the criteria and guidelines are built into rules and checks in the MTPS • High level process/flow of the TAZ delineation program • Schedule

  3. TAZs and TADsWhy define them? What are they? • Traffic Analysis Zones (TAZs): • a basic spatial unit of analysis representing an area containing similar kinds of land use and commuter travel • 5-year CTPP data • Traffic Analysis Districts: • aggregates of similar TAZs • 3-year CTPP data

  4. Criteria & Guidelines

  5. Criteria & Guidelines

  6. Criteria & Guidelines Interactively, one can only assign an area to one TAZ or one TAD. Adding an area assigned to an existing TAZ or TAD to a different TAZ or TAD will remove it from the original TAZ/TAD.

  7. Criteria & Guidelines • Nest within: • TAZ delineation - will not allow you to select geography in two different counties when creating or editing a TAZ • TAD delineation – will not allow you to delineate TADs outside the county coverage (in setup file) • Cover area of:

  8. Criteria & Guidelines

  9. Criteria & Guidelines

  10. Additional checks • Contiguity • Compactness

  11. High level TAZ/TAD delineation process/flow 1 Check the AASHTO website spreadsheets to confirm expected county coverage for 2010 TAZ/TAD delineation. Let us know ASAP if not what you expect. 2 Receive email from GEO TAZ team with customized setup file, and instructions to call for MTPS download username/password. Mid-March through April 3 Open setup file and confirm correct county coverage in “CoreCountyCoverage” 5 Download the MTPS software, partnership shapefiles (counties specified in setup files), and user documentation from Census Bureau’s website, save to local drive 6 Save setup file to the same local drive folder as thepartnership shapefiles (e.g., “TAZlayers”) 4 Call GEO TAZ Team for MTPS download username/password

  12. High Level TAZ/TAD delineation process/flow (2) Can divide work among multiple staff members prior to delineation (by editing the setup file (for dividing work on complete counties or administratively assigning county – parts) 4 Run setup for the MTPS, and Delineate TAZs and TADs b Delineate TAZs c Run TAZ verification checks a Choose startup methods for TAZs and/or TADs - TAZs: 2000 TAZs, 2010 tracts, 2010 block groups, scratch, BEFs - TADs (no TAZs): 2010 tracts, 2010 block groups - TADs (with TAZs): scratch and BEFs d Delineate TADs f “Report Changes” (i.e., create output files) e Run TAD verification checks

  13. High Level TAZ/TAD delineation process/flow (3) 5 FTP output files to Census Bureau, follow up with email Within 90 days from receipt of setup file email: mid-June to early-July 6 Census Bureau will run verification checks on submissions, and will contact program participant with any problems or issues that do not have clear fixes

  14. TAZ/TAD Delineation Timeline • February 25 & 28: Web-based TAZ delineation software training • March – April: Delineation materials available starting in March • June – July: Delineation submission returned to Census Bureau within 90 days of delineation material availability (i.e., receipt of setup file email)

  15. Questions? GEO TAZ team:geo.taz.list@census.gov 301.763.1099

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