Python GPXPy speed data is missing

[Loois1995]

I am trying to get data from a GPX file like this:

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" creator="Kurviger.de" version="1.1" xmlns:gh="https://kurviger.de/public/schema/gpx/1.1">
<metadata>
<link href="https://">
<text>text</text>
</link>
<time>2021-12-21T14:53:19Z</time>
</metadata>
<trk>
<name>data.gpx</name>
<trkseg>
<trkpt lat="55.015102" lon="15.275796"><speed>55.987000</speed><time>2021-12-21T14:53:19Z</time><desc>1</desc></trkpt>
<trkpt lat="55.015224" lon="15.275687"><speed>55.987000</speed><time>2021-12-21T14:53:19Z</time><desc>1</desc></trkpt>
<trkpt lat="55.015358" lon="15.275580"><speed>55.987000</speed><time>2021-12-21T14:53:19Z</time><desc>1</desc></trkpt>
<trkpt lat="55.015495" lon="15.275477"><speed>55.987000</speed><time>2021-12-21T14:53:19Z</time><desc>1</desc></trkpt>
</trkseg>
</trk>
</gpx>

As you can see the speed information is given in the gpx file.

To read the data (longitude, latitude, elevation and speed) if seperated the track points like this:

gpx_file = open("route.gpx", "r")
gpx = gpxpy.parse(gpx_file)

data = gpx.tracks[0].segments[0].points

The longitude, latitude, elevation are extracted correctly the speed information isnt. If i try to print it (for the first point for example but the issue can be found at all points):

print(data[0].speed)

None will be printed.

Can anybody help?

[davidefiocco]

This should be solved by invoking parse with a version argument set to "1.0".

gpx_file = open("route.gpx", "r")
gpx = gpxpy.parse(gpx_file,version="1.0")
data = gpx.tracks[0].segments[0].points

# for example
for pt in data:
    print(pt.speed)

[Loois1995]

This should be solved by invoking parse with a version argument set to "1.0".

gpx_file = open("route.gpx", "r")
gpx = gpxpy.parse(gpx_file,version="1.0")
data = gpx.tracks[0].segments[0].points

# for example
for pt in data:
    print(pt.speed)

Yes this works. Thank you

[tkrajina]

Exactly.

From the README says:

For example, GPX 1.0 specified a speed attribute for every track point, but that was removed in GPX 1.1. If you parse GPX 1.0 and serialize back with gpx.to_xml() everything will work fine. But if you have a GPX 1.1 object, changes in the speed attribute will be lost after gpx.to_xml(). If you want to force using 1.0, you can gpx.to_xml(version="1.0"). Another possibility is to use extensions to save the speed in GPX 1.1.