CODEWITHSUNDEEP
pythonxml-parsinggpx
Forest
Forest

Reputation: 29

gpxpy doesn't parse time attribute of track points

i'm trying to parse gpx file made by "Mission Planner". For some reason the softwere generates the gpx file of one line, which look like that:

<gpx creator="Mission Planner 1.3.48 build 1.1.6330.31130 ArduPlane V3.7.1 (22b5c415)" xmlns="http://www.topografix.com/GPX/1/1"><trk><trkseg><trkpt lat="31.7562743" lon="35.1812861"><ele>719.5</ele><time>2017-06-13T20:08:28+03:00</time><course>113.6</course><roll>-165.05</roll><pitch>1.74</pitch><mode /></trkpt><trkpt lat="31.7562703" lon="35.1812854"><ele>723.3</ele><time>2017-06-13T20:08:29+03:00</time><course>94.72</course><roll>-168.73</roll><pitch>8.55</pitch><mode /></trkpt><trkpt lat="31.7562648" lon="35.1812912"><ele>725.2</ele><time>2017-06-13T20:08:30+03:00</time><course>86.72</course><roll>-172.74</roll><pitch>4.67</pitch><mode /></trkpt> (...)

When i try to parse the gpx file with gpxpy (gpxpy-1.1.2), the track points have an empty time attributes, even though they do have have a field in the gpx file:

In [76]: a = gpx.tracks[0]
         b = a.segments[0]
         c = b.points[1]
         d = [c.longitude, c.latitude, c.elevation, c.time]
         d

Out[76]: [35.1812854, 31.7562703, 723.3, None]

obviously, that kills all the speed / duration calculations.

ideas? suggestions? + if anyone knows a parser / script that can change the gpx file to be readable, that would be nice. i'v tried to write one of my own, but the \n i insert somehow fuck up the gpx file, the gpxpy cannot parse it at all.

thx ahead, Forest.

Upvotes: 0

Views: 1751

Answers (1)

MethodMan
MethodMan

Reputation: 408

The GPX time format you posted is not correct. Let's try it with a GPX file that has the correct time format:

<?xml version="1.0" encoding="UTF-8"?>
<gpx creator="StravaGPX" 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 http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd" version="1.1" xmlns="http://www.topografix.com/GPX/1/1" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3">
 <metadata>
  <time>2017-08-07T14:46:23Z</time>
 </metadata>
 <trk>
  <name>Ride</name>
  <type>1</type>
  <trkseg>
   <trkpt lat="33.6545510" lon="-117.8939470">
    <ele>0.0</ele>
    <time>2017-08-07T14:46:23Z</time>
    <extensions>
     <gpxtpx:TrackPointExtension>
      <gpxtpx:atemp>20</gpxtpx:atemp>
     </gpxtpx:TrackPointExtension>
    </extensions>
   </trkpt>

As mentioned, the python code when using gpxpy is:

trax = gpx.tracks[0]
seg = trax.segments[0]
pt = seg.points[1]
print(pt.time)

Output:

2017-08-07 14:46:23+00:00

Upvotes: 1

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