multiply_ef

Calculate hot exhaust emissions by multiplying emission factors by distances
weighted by fleet composition profile.

internal

A bottom up model to estimate the emission levels of public transport systems based on General Transit Feed Specification (GTFS) data. The package requires two main inputs: i) Public transport data in the GTFS standard format; and ii) Some basic information on fleet characteristics such as fleet age, technology, fuel and Euro stage. As it stands, the package estimates several pollutants at high spatial and temporal resolutions. Pollution levels can be calculated for specific transport routes, trips, time of the day or for the transport system as a whole. The output with emission estimates can be extracted in different formats, supporting analysis on how emission levels vary across space, time and by fleet characteristics. A full description of the methods used in the 'gtfs2emis' model is presented in Vieira, J. P. B.; Pereira, R. H. M.; Andrade, P. R. (2022) <doi:10.31219/osf.io/8m2cy>.

Joao Bazzo

gtfs2emis

Estimating Public Transport Emissions from General Transit Feed
Specification (GTFS) Data

Rafael H. M. Pereira

Pedro R. Andrade

Sergio Ibarra-Espinosa

Ipea - Institute for Applied Economic Research 

multiply_ef function

<dl><dt>fleet_composition</dt>
<dd>vector; Fleet composition, which is a distribution
of fleet based on frequency. If there is only one, 'fleet_composition'
is 1.0.</dd>
<dt>dist</dt>
<dd>units ('km'); Length of each link in km.</dd>
<dt>ef</dt>
<dd>list or data.table; Emission factors.</dd>
<dt>aggregate</dt>
<dd>logical; if TRUE (default) emissions are aggregated by
pollutant.</dd>
<dt>prefix</dt>
<dd>character; Add prefix into emissions names. Missing parameter
(default) means empty prefix.</dd>
<dt>as_list</dt>
<dd>logical. If <code>TRUE</code> (default), the function returns the output
in a <code>list</code> format. If <code>FALSE</code>, the output is returned in a <code>data.table</code>
format.</dd></dl>

Arguments

Multiply emission factors by distances — multiply_ef

<dl>

<dt>fleet_composition</dt>
<dd>vector; Fleet composition, which is a distribution
of fleet based on frequency. If there is only one, 'fleet_composition'
is 1.0.</dd>


<dt>dist</dt>
<dd>units ('km'); Length of each link in km.</dd>


<dt>ef</dt>
<dd>list or data.table; Emission factors.</dd>


<dt>aggregate</dt>
<dd>logical; if TRUE (default) emissions are aggregated by
pollutant.</dd>


<dt>prefix</dt>
<dd>character; Add prefix into emissions names. Missing parameter
(default) means empty prefix.</dd>


<dt>as_list</dt>
<dd>logical. If <code>TRUE</code> (default), the function returns the output
in a <code>list</code> format. If <code>FALSE</code>, the output is returned in a <code>data.table</code>
format.</dd>

</dl>

multiply_ef: Multiply emission factors by distances

Description

Usage

Value

Arguments