R codes used in the research paper:

• Vieira, J. P. B., Pereira, R. H. M., & Andrade, P. R. (2023). Estimating public transport emissions from General Transit Feed Specification data. Transportation Research Part D: Transport and Environment, 119, 103757. https://doi.org/10.1016/j.trd.2023.103757

The R scripts to reproduce the results are divided into six steps:

• 1.0_data-preparation.R
  • It downloads the gtfs2emis v. 0.1.0 (Zenodo)
  • Downloads the input data (gtfs of July and October, raster of Sao Paulo city, bus occupancy, vehicle fleet)
• 1.1_prep_occupancy_data.R
  • Preprocess data of urban bus occupancy
• 2_core_functions.R
  • Runs the transport_model() and emission_model() for gtfs2emis
  • Uses auxiliar functions to estimate emissions by: hour of the day, by grid of Sao Paulo city , by age of fleet, by grid and time of the day
  • Saves the main outputs (from transport_model() and emissions_model()), and pre-processed outputs (from emis_summary(), emis_to_dt() and emis_grid() operations)
• 3_plots.R
  • Generates all the plots shown in the research paper
  • Figures is saved in Figures/
• 4_main_statistics.R
  • Generate summary tables and specific information for the discussion section
• 5_emissions_comparison.R
  • Compares the emissions from case of study with IEMA
• 6_plots_passenger.R
  • Generate figures for emissions per urban bus passenger

The full article of gtfs2emis can be acessed Vieira, Pereira and Andrade (2022).