read_gpx {eddington}

Read a GPX file into a data frame containing dates and distances

Description

Reads in a GPS Exchange Format XML document and outputs a data.frame containing distances. The corresponding dates for each track segment (trkseg) will be included if present in the source file, else the date column will be populated with NAs.

Usage

read_gpx(file, units = c("miles", "kilometers"))

Arguments

file

The input file to be parsed.

units

The units desired for the distance metric.

Details

Distances are computed using the Haversine formula and do not account for elevation changes.

This function treats the first timestamp of each trkseg as the date of record. Thus overnight track segments will all count toward the day in which the journey began.

Value

A data frame containing up to two columns:

date

The date of the ride. See description and details.

distance

The distance of the track segment in the requested units.

Examples

## Not run: 
# Get a list of all GPX export files in a directory tree
gpx_export_files <- list.files(
  "/path/to/gpx/exports/",
  pattern = "\\.gpx$",
  full.names = TRUE,
  recursive = TRUE
)

# Read in all files and combine them into a single data frame
rides <- do.call(rbind, lapply(gpx_export_files, read_gpx))

## End(Not run)