fix-elevation.py

"""
Fixes erroneous elevations in GPX tracks.
"""

import sys
import gpxpy
import gpxpy.gpx

file_name = sys.argv[1]

with open(file_name, 'r') as fp:
    gpx = gpxpy.parse(fp)

for track in gpx.tracks:
    track.extensions = []
    for segment in track.segments:
        last_elevation = segment.points[0].elevation
        for point in segment.points:
            diff = abs(point.elevation - last_elevation)
            if diff > 100:
                print('Fixing elevation of', point.elevation, 'to', last_elevation)
                point.elevation = last_elevation
            last_elevation = point.elevation

# Gaia's XML extensions trip up the import.

with open(file_name, 'w') as fp:
    fp.write(gpx.to_xml())