ndsbr

The goal of ndsbr is to help you load, manipulate and analyze the data sample of the Brazilian Naturalistic Driving Study (NDS-BR).

Overview

This package provides four main categories of functions: nds_create, nds_calc, nds_join, and nds_download. nds_create functions are used to create spatial objects in sf format, using the naturalistic data as input:

• nds_create_points
• nds_create_lines

nds_calc functions can be used to extract basic information of the naturalistic sample (traveled time or traveled distance) and safety-related variables, such as speeding:

• nds_calc_dist
• nds_calc_time
• nds_calc_speeding

nds_join functions performs spatial join operations between ndsbr data and other spatial data, like road axis (nds_join_axis), neighborhood data (nds_join_neigh), and speed limit data (nds_join_spdlimit).

nds_load_data is used to load naturalistic data and nds_download functions ( nds_download_sf, nds_download_cwb_osm) can be used to download spatial data and import into the project environment.

A brief presentation (in portuguese) about ndsbr can be accessed here.

Installation

You can install the current version of ndsbr like so:

# install.packages("devtools")
devtools::install_github("pabsantos/ndsbr")

Example

This is a basic example which shows you how to load NDS-BR data and calculate traveled distances. First, nds_load_data loads the sample from all NDS-BR files inside a specific folder, defined by the user.

library(ndsbr)
path <- system.file("extdata", package = "ndsbr") ## Example files location
nds_data <- nds_load_data("driver", path)

head(nds_data, n = 5)
#> # A tibble: 5 × 34
#>   DRIVER  LONG   LAT DAY       DAY_CORRIGIDO `03:00:00`  TRIP ID    PR         H
#>   <chr>  <dbl> <dbl> <chr>     <chr>         <chr>      <dbl> <chr> <chr>  <dbl>
#> 1 A      -49.2 -25.5 26/8/2019 26/8/2019     22:17:27       5 A05   19:17…    NA
#> 2 A      -49.2 -25.5 26/8/2019 26/8/2019     22:17:28       5 A05   19:17…     0
#> 3 A      -49.2 -25.5 26/8/2019 26/8/2019     22:17:29       5 A05   19:17…     0
#> 4 A      -49.2 -25.5 26/8/2019 26/8/2019     22:17:30       5 A05   19:17…     0
#> 5 A      -49.2 -25.5 26/8/2019 26/8/2019     22:17:31       5 A05   19:17…     0
#> # ℹ 24 more variables: M <dbl>, S <dbl>, TIME_ACUM <dbl>, SPD_MPH <dbl>,
#> #   SPD_KMH <dbl>, ACEL_MS2 <dbl>, HEADING <dbl>, ALTITUDE_FT <dbl>,
#> #   VALID_TIME <chr>, TIMESTAMP_GPS <chr>, CPOOL <chr>, CPOOLING_CHECKED <chr>,
#> #   WSB <chr>, UMP_YN <chr>, UMP <chr>, PICK_UP <chr>, ACTION <chr>,
#> #   GPS_FILE <chr>, CIDADE <chr>, BAIRRO <chr>, NOME_RUA <chr>,
#> #   HIERARQUIA_CWB <chr>, HIERARQUIA_CTB <chr>, LIMITE_VEL <chr>

Creating a sf object with linestring geometry using nds_create_lines

nds_lines <- nds_create_lines(nds_data, x = LONG, y = LAT)

plot(nds_lines["DRIVER"])

Finally, nds_calc_dist extracts traveled distance, grouped by a variable defined by the user.

nds_dist <- nds_calc_dist(nds_lines, geom = wkt_lines, by = DRIVER)
nds_dist
#> # A tibble: 3 × 2
#>   DRIVER   DIST
#>   <chr>   <dbl>
#> 1 A      22508.
#> 2 B      51529.
#> 3 C      37736.