Analisando a Variabilidade de Estimativas de Acessibilidade por Transporte Público a Partir de Dados de GPS

Abstract

Accessibility is a key concept in transport and land use integrated planning. General Transit Feed Specification (GTFS) has been used with success as a data source to estimate accessibility in recent years, but it relies on scheduled transit trips to estimate travel times between origin-destination pairs. On the other side, GPS data of a transit system can be used to calculate travel times between stops for each trip that happens in the system, but it can impose methodological/computational challenges and make use of median travel times to reconstruct the GTFS file. Using one month of GPS data from Fortaleza, Brazil, it is analyzed the variability of accessibility using empirical travel times and considering its dispersion. Results show that variability changes in space and between activities, possibly affecting the assessment and proposition of interventions on the transportation system.

Estimating public transport emissions from General Transit Feed Specification data

“…This type of research can also be used to better understand the health effects of public transport services and corridors on local communities. While these research questions could be conducted based on GTFS data with the gtfs2emis model, future research could use GPS data to update the speed and departure times information of GTFS feeds to account for real traffic conditions and improve the accuracy of emission estimates, as done in previous studies (Wessel et al, 2017;Braga et al, 2020;Elliott & Lumley, 2020). Finally, the easy applicability of the gtfs2emis package in R could help further promote open science and reproducible research projects in transport and environmental modeling to pursue more sustainable cities.…”