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Step-by-Step Tutorial NEXTA: Simulation Data Visualizer for Open-Source DTALite Engine

Step-by-Step Tutorial NEXTA: Simulation Data Visualizer for Open-Source DTALite Engine. NEXTA: N etwork EX plorer for T raffic A nalysis This tutorial is prepared by Dr. Xuesong Zhou and Mingxin Li at Univ. of Utah. Major Components of Software Package.

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Step-by-Step Tutorial NEXTA: Simulation Data Visualizer for Open-Source DTALite Engine

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  1. Step-by-Step Tutorial NEXTA: Simulation Data Visualizer for Open-Source DTALite Engine NEXTA: Network EXplorer for Traffic Analysis This tutorial is prepared by Dr. Xuesong Zhou and Mingxin Li at Univ. of Utah

  2. Major Components of Software Package DTALite: Open-source Assignment/Simulation Engine DTALite is a fast open-source dynamic traffic assignment engine, which aims to assist transportation planners to effectively utilize advanced dynamic traffic analysis tools with limited hardware and time resources. It uses a computationally simple but theoretically rigorous traffic queuing model in its lightweight mesoscopic simulation engine. DTALiteis distributed as open-source software using the GNU General Public License (GPL). Its source code is available at http://sourceforge.net/projects/dtalite/ NEXTA: GUI for Visualization and Data Preparation NEXTA (Network EXplorer for Traffic Analysis) is a graphical user interface to facilitate preparation, post-processing and analysis of simulation-based dynamic traffic assignment datasets. NEXTA is extended from DYNASMART-P Graphical Input Editor (DSPEd) 1.0, which was initially developed by ITT Industries, Inc. for the Federal Highway Administration (FHWA) in 2004. Dr. Xuesong Zhou has been maintaining and enhancing its capabilities since then. NEXTA is distributed as Freeware, and it is now also used as the visualization program for TRANSIMS, an open-source software package for transportation analysis and simulation.

  3. Sample Data Set: Portland Network and Demand Data # of Zones = 2,013 # of Nodes = 10,094 # of Links = 25,804 # of Vehicles = 1.1M for 4 hours Computer Settings: Intel Core 2 Duo CPU (2 processors) 2.26 GHz 4 GB of RAM Total computation time for 10 iterations: 4 hours Computation time per iteration: 24 min

  4. Sample Vehicle Plot

  5. Sample MOE Display

  6. Sample Link MOE Plot

  7. Sample Vehicle-path Analysis Plot

  8. Tutorial Outline • Software installation • Exercise 1: View simulation results • Exercise 2: Running traffic simulation and understand output files • Exercise 3: Prepare input data from Excel spreadsheet

  9. Install NEXTA for DTALite (1) Step 1: Install NEXTA “C:\Program Files\NEXTA_for_DTALite” Step 2: Install Visual C++ 2008 redistribution package Go to folder C:\Program Files\NEXTA_for_DTALite \VisualC++_RedistributionPackage and click on “vcredist_x86.exe” to install. Step 3: Install “Data Access Object” redistribution package Go to C:\Program Files\ NEXTA_for_DTALite\ VisualC++_RedistributionPackage\DISK1, click on “Setup.exe” to install.

  10. Install NEXTA for DTALite (2) Remarks: You need an Administrator account to install the NEXTA package. Please save your DTALite data set to a “writable” folder (e.g. C:\DTALite\DataSets\”. Folder “Program Files” could be set to “read-only” by your Windows operating systems. Please visit http://docs.google.com/View?id=drpjtjx_112d99s3mgc for the latest NEXTA for DTALite software release and additional data set. 4) The release data of your current NEXTA package can be found at menu -> Help -> About.

  11. Details at Installation Folder Dynamic Traffic Assignment Engine Datasets Graphical User Interface

  12. Hardware and Software Requirements • Hardware recommendations • Minimum memory of 512 MB. • Recommended options for large-scale network: 4GB of RAM • Remarks: An insufficient amount of RAM can cause your computer to continually read data from disk instead of physical memory, please ensure there is sufficient memory for very large networks. • Operating system requirements • Windows 2000 • Windows XP • Windows Vista (32 bit/64 bit) • Windows 7

  13. Exercise 1: Visualization What we will learn: Step 1: Import Data from Excel Spreadsheet Step 2: Save a project Step 3: Run Traffic Simulation/Assignment Step 4: Resize the Network Step 5: Double-Click a Link to Show Link Property Step 6: Display Capacity and Demand Attributes Step 7: Select Display Mode to View Simulation Results (Density, Speed, Queue and Volume) Step 8: Select Vehicle Display Mode Step 9: Show Simulation Results at a Given Time Period Step 10: Play Animation Step 11: Double-Click a Link to Show MOE Profile Step 12: Configure MOE Display Dialog Step 13: Multi-link Comparison Step 14: Network-level MOE Step 15: Vehicle-path Analysis Step 16: Find Paths in NEXTA Step 17: View Summary.log Step 19: Change Link Capacity Step 20: Save the changes Step 21: Re-run Simulation Step 22: Save to Another Folder Step 23: Re-load previous dataset Step 24: Compare Capacity Change Visually Step 25: Compare Network MOEs Step 26: Run Simulation: Check Network-level MOE Step 27: Check Link-level MOE Step 28: Locate Other MOE files Step 29: Read On-line Document

  14. Step 1: Import Data from Excel Spreadsheet • Filename: SampleNetwork.xls • Dataset folder: C:\Program Files\NEXTA_for_DTALite\DataSets • The data structure of the spreadsheet will be explained in Exercise 3.

  15. Step 2: Save a project Suggested folder C:\DTALite\DataSets\Sample2

  16. Step 3: Run Traffic Simulation/Assignment Run Traffic Simulation/Assignment

  17. Step 4: Tool bar -> Zoom In /Out, Resize the Network View Tools Distance Move Network Pan Zoom In Zoom Out Show Entire Network Show/Hide Grid Show/Hide Node Show/Hide Zone

  18. Step 5: Double-Click a Link to Show Link Property

  19. Step 6: Display Capacity and Demand Attributes Display OD volume Display link capacity

  20. Step 7: Select Display Mode to View Simulation Results (Density, Speed, Queue and Volume)

  21. Step 8: Select Vehicle Display Mode

  22. Step 9: Show Simulation Results at a Given Time Period First number is current time stamp Second number is simulation horizon Clock Bar Slider

  23. Step 10: Play Animation Rewind, play, pause, stop Remarks: Simulation clock is advanced in 1-min interval

  24. Step 11: Double-Click a Link to Show MOE Profile Upstream node -> Downstream node (# link ID) Green line indicates the current simulation time Time axis (unit: min)

  25. Step 12: Configure MOE Display Dialog • Select MOE: Density, Speed, Queue Length, Volume • Start Time, End Time, Max Y • Export data to Excel • Change Background color

  26. Step 13: Multi-link Comparison Select multiple links (by using Ctrl+ mouse click) to display MOE time profiles simultaneously for multiple selected links, in the same or different projects.

  27. Step 14: Display Network-level MOE

  28. Step 15: Vehicle-path Analysis OD to paths Paths to vehicles Vehicles –to list of links Select a path from path list to highlight the path on the background network

  29. Step 16: Find Paths in NEXTA Define Origin Define Destination Find Paths

  30. Step 17: View Summary.log

  31. Step 18: Change Link Capacity Change capacity from 900 into 800

  32. Step 19: Change Demand Increase overall demand level Change demand of individual OD pairs Change OD demand (14) from 5000 into 6000 Change Overall Multiplication Factor from 1.0 into 1.5

  33. Step 20: Save the changes

  34. Step 21: Save to Another Folder C:\DataSets\Sample\After_Increase_Demand\After_Increase_Demand.dlp

  35. Step 22: Re-run Simulation

  36. Step 23:Re-load Previous Dataset Window Tile Vertically previous dataset

  37. Step 24: Compare Capacity Change Visually

  38. Step 25: Compare Network MOEs

  39. Step 26: Run Simulation: Network-level MOE

  40. Step 27: Run Simulation: Link-level MOE

  41. Step 28: Locate Other MOE files

  42. Step 29: Read On-line Document

  43. Advanced Topic 1: • Scenario Configuration • Locate major output files

  44. Step 1: Configuring DTASettings.ini Global multiplication factor will multiply each OD pair by that factor.

  45. Running Simulation: Illustration of Demand Loading/Simulation Horizon, Departure Time Interval

  46. Step 2: View AssignmentMOE.csv Iteration Time stamp in minute Cumulative in-flow count Cumulative out-flow count Number of vehicles in the network Flow in a minute Average trip-time in minute

  47. Step 3: LinkMOE.csv Iteration From-node ID To-node ID Timestamp in minute Travel time in minute Delay in minute Link volume in vehicle Link volume in vehicle/hour/lane (vehphpl) Density in vehicle/mile/lane Speed in mph Exit queue length Cumulative arrival count Cumulative departure count

  48. Step 4: Vehicle.csv Iteration Vehicle ID Origin zone ID Destination zone ID Departure time Arrival time Complete flag Trip time Vehicle type Occupancy Information type Value of time Minimum path cost Distance in mile Number of nodes Node id Node arrival time

  49. Advanced Topic: Import and Change Time-dependent Demand Sample time-of-day demand profile

  50. Running Simulation: Change OD Demand Distribution

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