Extract basic GPS data (lat, lon, elevation, timestamp) from GPX, and dump it into a CSV file. Requires the gpxpy library.

extract_from_gpx.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Output Elevation, Lat, Long, and Timestamp series from GPX to CSV
Requires gpxpy
This script expects your input GPX to be located in a subdir named 'data'

"""

import os
import gpxpy
import gpxpy.gpx
import csv

outputdir = "output"
os.path.exists(outputdir) or os.makedirs(outputdir)

# put your GPX file in a subdir named 'data'
try:
    gpx_file = open(os.path.join("data", "input.gpx"), "r")
    gpx = gpxpy.parse(gpx_file)
except IOError:
    print("Couldn't open the input GPX file. Ensure it's in the 'data' dir.")
    raise()


def write_csv():
    """ coroutine for writing dicts to a CSV as rows """
    header_written = False
    # create a CSV writer object
    with open(os.path.join(outputdir, "output.csv"), "w") as f:
        while True:
            data = (yield)
            # don't bother writing anything unless we have GPS data
            dw = csv.DictWriter(f, sorted(data.keys()))
            if not header_written:
                dw.writeheader()
                header_written = True
            dw.writerow(data)

# initialise csv output co-routine
output = write_csv()
output.next()
# dump each lat/lon/elevation/timestamp into a dict, with a Unix timestamp
for track in gpx.tracks:
    for segment in track.segments:
        for point in segment.points:
            output.send({
                "Lat.": point.latitude,
                "Lon.": point.longitude,
                "Elev.": point.elevation,
                "Timestamp": point.time.isoformat()
            })

How can you get rid of the string "Elev.,Lat.,Lon." at the beginning of the csv file? My GPS device can't deal with it. Otherwise very nice work! Thank You.

That's called the header of a CSV file, so it might help to comment out dw.writeheader().

OK, Thanx.