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Agenda

Agenda. Overview Why TransCAD Challenges/tips Initiatives Applications. Overview. Transportation planning and policy guidance 3 C process Planning tools Travel demand modeling Project level forecasts. Role of Statewide Planning. Organizational Structure.

PamelaLan
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Agenda

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  1. Agenda • Overview • Why TransCAD • Challenges/tips • Initiatives • Applications

  2. Overview

  3. Transportation planning and policy guidance 3 C process Planning tools Travel demand modeling Project level forecasts Role of Statewide Planning

  4. Organizational Structure

  5. Technical service center for the branch Provide expertise, research, and training in travel modeling Advance travel modeling and analysis for the State of North Carolina 6 positions for advanced modeling Model Research and Development Team

  6. MPO/RPO planning 17 MPOs 20 RPOs Modeling for communities greater than 10,000 population 40 positions for planning/modeling Planning Groups

  7. 3 regional models under development Covering 9 MPOs 6 TransCAD MPO models currently in use Developed ground up/converted 6 TransCAD MPO models in progress Upgrades/new starts 10 non-MPO models TransCAD Modeling Status

  8. NCDOT Modeling Improvement Goals • Develop “best modeling practices.” • Investigation of model improvements • New procedures to better address land use feedback • Tools to improve efficiency and reliability

  9. Why TransCAD?

  10. Older platform no longer supported Limited capabilities Graphics, network size, TAZs More GIS integration Movement towards GIS based analysis Compatible with ArcGIS Ability to do spatial analysis Why NCDOT Decided to Switch Platforms?

  11. Advanced developers Developers Advanced end users Basic end users Why TransCAD?Diverse Users

  12. Windows based Scenario manager for easy file management Visualization Data and database GISDK Why TransCAD?General

  13. Integration of GIS tools and technologies Improved linkage between land use, transportation, and air quality Development of database structures Application batch files, GIS tools, and Graphical Users Interface Why TransCAD?GIS Capabilities

  14. Data Interface with ArcGIS GIS database Existing data sources (census, others) Visualization Why TransCAD?Modeling Process

  15. Networks GIS database with unlimited attribute capabilities GIS distances and shapes Database linkages to other data sets Why TransCAD?Modeling Process

  16. Trip generation Robust cross classification model GISDK programming for custom applications Unlimited trip purposes Multiple variables can be stored in TAZ land use data base or linked via parcel data base Why TransCAD?Modeling Process

  17. Trip distribution Geocode survey data to determine trip lengths Visualize desire lines between zones or districts Utilize curve functions for friction factors in place of lookup table Why TransCAD?Modeling Process

  18. Mode choice Built in procedures for streamlined transit analysis Use GISDK to customize nested LOGIT model Why TransCAD?Modeling Process

  19. Traffic assignment Easy time of day analysis User defined link volume-delay equation Multiple assignment algorithms Comparison tools for evaluating different assignments Why TransCAD?Modeling Process

  20. Performance measures Use database fields to easily query link types for evaluation GISDK allows for consistent checking and reporting of model results Visualization of results Screenline analysis User log available Why TransCAD?Modeling Process

  21. Challenges/tips

  22. TIP: recommended for immediate use of TransCAD on existing models TRIP: converted base is NOT ready to go TIP: use performance measures to build confidence in converted model - will need to adjust for differences TRIP: TransCAD recognizes real numbers - will account for differences Challenges/tipsConversion Process

  23. Think about things differently File management Dataview save MAP save Powerful computer Challenges/tips

  24. Initiatives

  25. Training Standards Users group Applications Initiatives

  26. Applications

  27. GISDK Tools for Travel Demand ModelingModel Research & Development UnitNCDOT Statewide Planning Branch

  28. The Geographic Information System Developer’s Kit (GISDK) provides you with a tool kit that you can use to get outside the box and customize TransCAD in any way you desire.

  29. Model Team Goal: Process Improvement Through the development of applications tools for streamlining the model development process

  30. Meeting the Process Improvement Goal • Data management tool • Trip generation tool • Performance management tool • Miscellaneous tools

  31. Data Management

  32. Old Way of Managing Model Data • Create separate fields for attribute data: • Travel time, capacity, ADT, facility type, functional classification, etc. • Enter data using TransCAD interface • Create multiple geographic files for different alternatives

  33. Disadvantages of the Old Way • Manual recalculation of travel times and other attribute data • Current data entry approach is time consuming and prone to errors • Maintaining multiple geographic files is cumbersome and requires more disk space • Maintaining multiple geographic files increases the chance of introducing errors in the files

  34. Model Data Management Tools

  35. Model Data Management Tools • TransCAD GISDK script • Select data values automatically calculated • Travel time, 1-way attributes, facility type, etc • Easy user interface for entering data • Provides a data management system for multiple model alternatives • Alternatives managed from master file

  36. Benefits of Using Data Management Tools • Reduced errors • Increased efficiency • Eliminates duplicated data • Requires less disk space • Maintains the consistency of the model data • Standardizes model data management

  37. Calculate Travel Time Tool Calculates travel time, 1-way capacity, 1-way ADT, facility code and functional classification code automatically every time data is changed

  38. Enter Base Data Tool Provides a GUI (graphic user interface) to enter or modify base model data for single or multiple links

  39. Build Base Network Tool Builds the base network from the master line layer

  40. Identify New Link Tool Identifies the future links that are not in the base network

  41. Enter Alternative Data Tool Provides a GUI to enter or modify alternative network data for single or multiple links

  42. Build Network Alternative Tool Builds the network alternative from the master line layer

  43. Trip Generation

  44. NCDOT Trip Generation Procedure • Average trip rate per household • Percentage applied to total trips to determine trips by trip purpose • Accounts for CV trips and non-home based trips by non-residents • Data input in ASCII format and executed in C+ program

  45. Disadvantages of the Old Way • Data input methodology is cumbersome and prone to data entry error • No ability to visualize data • User cannot easily interpret the data

  46. Benefits of Using Trip Generation Tool • Reduced errors • Increased efficiency • Eliminates duplicated data • TransCAD data file facilitates visualization of data

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