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jedie/generated_10km.gpx

Last active June 20, 2018 03:07
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generated_10km.gpx
<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd" version="1.1" creator="gpx.py -- https://github.com/tkrajina/gpxpy">
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</gpx>
Raw
half_equator.gpx
<?xml version="1.0" encoding="UTF-8"?>
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</trkpt>
<trkpt lat="0" lon="121.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="122.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="123.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="124.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="125.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="126.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="127.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="128.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="129.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="130.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="131.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="132.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="133.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="134.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="135.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="136.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="137.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="138.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="139.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="140.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="141.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="142.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="143.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="144.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="145.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="146.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="147.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="148.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="149.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="150.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="151.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="152.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="153.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="154.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="155.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="156.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="157.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="158.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="159.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="160.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="161.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="162.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="163.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="164.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="165.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="166.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="167.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="168.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="169.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="170.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="171.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="172.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="173.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="174.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="175.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="176.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="177.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="178.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="179.0">
<ele>0</ele>
</trkpt>
<trkpt lat="0" lon="180.0">
<ele>0</ele>
</trkpt>
</trkseg>
</trk>
</gpx>
Raw
test_gpx.py
from gpxpy.gpx import GPX, GPXTrack, GPXTrackPoint, GPXTrackSegment
# circumference of the equator is 40075.017 kilometres (WGS 84)
km_per_longitude = 40075.017 / 360 # ==> 111.31949166666666 km
def generate_gpx_track(track_length_km, point_count, start_longitude=0):
distance_km = track_length_km / point_count
longitude_diff = distance_km / km_per_longitude
gpxpy_instance = GPX()
gpxpy_instance.tracks.append(GPXTrack())
gpxpy_instance.tracks[0].segments.append(GPXTrackSegment())
points = gpxpy_instance.tracks[0].segments[0].points
points.append(GPXTrackPoint(latitude=0, longitude=start_longitude, elevation=0))
current_longitude = start_longitude
for point_no in range(point_count):
current_longitude += longitude_diff
points.append(GPXTrackPoint(latitude=0, longitude=current_longitude, elevation=0))
return gpxpy_instance
def compare_10km():
track_length_km = 10
gpxpy_instance = generate_gpx_track(
track_length_km=track_length_km,
point_count=100,
)
assert gpxpy_instance.get_points_no() == 101, gpxpy_instance.get_points_no()
# print(gpxpy_instance.to_xml())
assert gpxpy_instance.length_2d() == gpxpy_instance.length_3d()
gpxpy_length_km = gpxpy_instance.length_3d() / 1000
diff_km = track_length_km - gpxpy_length_km
return gpxpy_length_km, track_length_km, diff_km
def compare_half_earth_equator():
track_length_km = 40075.017 / 2 # Half the length of the earth equator in kilometers
gpxpy_instance = generate_gpx_track(
track_length_km=track_length_km,
point_count=180,
)
assert gpxpy_instance.get_points_no() == 181, gpxpy_instance.get_points_no()
# print(gpxpy_instance.to_xml())
# <trkpt lat="0" lon="0">...</trkpt>
# <trkpt lat="0" lon="1.0">...</trkpt>
# <trkpt lat="0" lon="2.0">...</trkpt>
# ...
# <trkpt lat="0" lon="179.0">...</trkpt>
# <trkpt lat="0" lon="180.0">...</trkpt>
assert gpxpy_instance.length_2d() == gpxpy_instance.length_3d()
gpxpy_length_km = gpxpy_instance.length_3d() / 1000
diff_km = track_length_km - gpxpy_length_km
return gpxpy_length_km, track_length_km, diff_km
if __name__ == '__main__':
print("\ncompare_10km():")
gpxpy_length_km, track_length_km, diff_km = compare_10km()
print("real length...: %.1f m" % round(track_length_km * 1000, 1))
print("gpxpy length..: %.1f m" % round(gpxpy_length_km * 1000, 1))
print("Diff..........: %.1f m" % round(diff_km * 1000, 1))
print("\ncompare_half_earth_equator():")
gpxpy_length_km, track_length_km, diff_km = compare_half_earth_equator()
print("real length...: %.1f km" % round(track_length_km, 1))
print("gpxpy length..: %.1f km" % round(gpxpy_length_km, 1))
print("Diff..........: %.1f km" % round(diff_km, 1))
#
# results with "never use" gpxpy.geo.haversine_distance():
#
# compare_10km():
# real length...: 10000.0 m
# gpxpy length..: 9982.1 m
# Diff..........: 17.9 m
#
# compare_half_earth_equator():
# real length...: 20037.5 km
# gpxpy length..: 20001.6 km
# Diff..........: 35.9 km
#
# results with force using gpxpy.geo.haversine_distance():
#
# compare_10km():
# real length...: 10000.0 m
# gpxpy length..: 9988.8 m
# Diff..........: 11.2 m
#
# compare_half_earth_equator():
# real length...: 20037.5 km
# gpxpy length..: 20015.1 km
# Diff..........: 22.4 km
@snake-plissken
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snake-plissken commented Jun 20, 2018 •
edited
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Ieee posted on the wrong thread, see: tkrajina/gpxpy#123 (comment)

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