R Script to pull together GPS waypoints from multiple GPX files into a single CSV file

multiGPXtoCSV.r

# MD Madhusudan, [email protected], Nature Conservation Foundation, 2016-04-10
# Code to import waypoints from multiple GPX files in a folder,
# extract coordinates from each file into a single object, and 
# export to CSV or some other format
# 
# - initialisation steps
library(plotKML)
library(dplyr)

# Set working directory to folder where all the GPX Waypoint files are present
setwd("~/Desktop/")

# - List all filenames in folder starting with "Waypoint"
# Works for waypoint files with names like "Waypoints_22-FEB-16.gpx"
files <- list.files(pattern = "\\bWaypoints_")

# Initialise empty data frame
wpfull <- NULL

for (i in 1:length(files)) {
  # - Select first file from the list and import data into R object
  wplist <- readGPX(files[i], way=T)
  # extract latitude, longituDe, elevation, time, name and comments and apppend to R dataframe
  wpdf<- wplist$waypoints
  # append dataframe from last index to a full waypoint object
  wpfull <- bind_rows(wpfull, wpdf)
}

# export object with all waypoints to csv file
write.csv(wpfull, "finalwp.csv") 

Hi, what if my data is not contained under waypoints, but under tracks - how to expand that part into a dataframe?

To add to above, I get an error message: Error: Argument 1 can't be a list containing data frames

Hi! This was a quick script I put together to help a student many years ago to import her data into R. Haven’t looked at it in ages, so I am terribly sorry that I am a bit too rusty about it to respond or help debug without looking at it from scratch. Unfortunately, it doesn’t look like I’ll have the time to do so in the immediate future...  will reach out to you if I do. My apologies once again! M

…

--- Madhu

On 14 Feb 2020, 7:12 PM +0530, ginskr ***@***.***>, wrote: To add to above, I get an error message: Error: Argument 1 can't be a list containing data frames — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

To add to above, I get an error message: Error: Argument 1 can't be a list containing data frames

Hi, what if my data is not contained under waypoints, but under tracks - how to expand that part into a dataframe?

The dataframe containing the consecutive points of your trackline is nested within the wplist as a list in a list in a list. I was able to access mine using the following:

tracklinedf <- wplist$tracks[[1]][[1]]

Updated script with sf utilities incorporated here:
https://github.com/vjjan91/acoustics-westernGhats/blob/master/code/04_extract-waypoints-from-gps.R