NVTA TAPLite workflow

This project distributes the complete NVTA traffic-assignment workflow as one versioned Python package. It includes network and demand conversion, calibrated resources, QVDF parameter overrides, the TAPLite assignment sequence, QVDF speed smoothing, aggregation, postprocessing, and run logging.

The project-specific orchestration is separate from the native assignment engine. This package depends on the verified taplite4mpo-pre-release==0.4.0rc1 wheel from PyPI.

Installation

The supported client setup is client\setup_environment.bat. Every setup run recreates the dtalite_pipeline Miniforge environment and installs or upgrades this package from PyPI. For a quick in-place package update, use client\update_environment.bat.

During the release-candidate phase, a direct update is:

python -m pip install --upgrade --pre --only-binary=:all: nvta-taplite-workflow

Rerunning setup_environment.bat is the clean-refresh path: it removes and recreates dtalite_pipeline. update_environment.bat only updates the installed package in the existing environment.

Permanent client launchers

Keep the small client folder with the project. The Python launchers are shown first because they are the clearest interface; they require either an active dtalite_pipeline environment or conda run as shown below.

Python launchers

conda run --no-capture-output -n dtalite_pipeline python run_assignment.py `
  --scenario-dir "C:\path\to\scenario"

conda run --no-capture-output -n dtalite_pipeline python run_postprocessing.py `
  "C:\path\to\scenario"

If dtalite_pipeline is already active, omit the conda run ... prefix:

python run_assignment.py --scenario-dir "C:\path\to\scenario"
python run_postprocessing.py "C:\path\to\scenario"

Batch launchers

The batch launchers locate Miniforge themselves and do not require conda activate or conda init:

run_assignment.bat --scenario-dir "C:\path\to\scenario"
run_postprocessing.bat "C:\path\to\scenario"

Assignment defaults to network conversion, demand conversion, all four daily periods, TAPLite assignment, calibrated QVDF override, QVDF smoothing, and aggregation. Disable a stage explicitly only for a diagnostic run, for example --network-conversion false --demand-conversion false --dtalite-assignment false.

Commands

python -m nvta_taplite_workflow assignment --scenario-dir "C:\path\to\scenario"
python -m nvta_taplite_workflow postprocess "C:\path\to\scenario"
python -m nvta_taplite_workflow doctor
python -m nvta_taplite_workflow version

Postprocessing writes two daily link-performance files and two matching statistics files under the DTALite output folder:

• link_performance_combined_processed.csv and statistics_data.csv retain the established NVTA jurisdiction/TAZ-range scope.
• link_performance_combined_processed_regional.csv and statistics_data_regional.csv cover all regional roadway links without the NVTA jurisdiction/TAZ-range filter.

Both postprocessed link-performance files include the source network's STREETNAME and full WKT geometry fields.

The files in client are permanent thin launchers. They contain no workflow logic and do not need to change when conversion, assignment, smoothing, or postprocessing internals change.

Python API

from nvta_taplite_workflow import (
    AssignmentConfig,
    PostprocessingConfig,
    run_assignment,
    run_postprocessing,
)

The command-line interface is the preferred compatibility boundary. New internal stages use package defaults, so existing client commands keep working.

Resources and output safety

All lookup tables and dictionaries are immutable package data. Runtime outputs, logs, conversion caches, QVDF backups, and audit manifests are written only to the selected scenario or output location.

The QVDF smoother normally stages its transient SQLite database beside local outputs. When the output resolves to a UNC share, the database is staged in the user's local temporary directory because SQLite URI authorities and network filesystem locking are unreliable. It is deleted after the run. Final results, backups, reports, and logs remain on the selected scenario share. Set NVTA_QVDF_TEMP_DIR to an approved local scratch folder when company policy requires a specific temporary location.

Every run records the installed workflow version, TAPLite version, and resource provenance so an environment can be reproduced or rolled back.

Development

python -m pip install -e .
python -m unittest discover -s tests -p "test_*.py"
python -m build
python -m twine check dist\*

Release details are in RELEASING.md.