I have a manual QGIS system that starts when I load a GPX file into QGIS and perform a number of actions on it. It all works perfectly.
I want to automate this process using the QGIS Graphical Modeler, so I can batch process a whole directory of GPX files.
When I start the process manually the GPX import dialogue box asks which vector layers I want to load from the GPX file:
I select the tracks layer and everything proceeds smoothly.
To automate my system I use the Vector Layer Input element in the Graphical Modeler. I define the import as Line so that it can be picked up by Polygonize.
However, when I try to polygonize this line layer the process fails - I am not sure why - maybe because there are no routes defined in my GPX files?
UPDATE: I swapped the <trk> and <trkpt> tags for <rte> and <rtept> tage in a GPX file and made a 'route layer'. Manually I was able to make a polygon from the route line but, once again, the automated model failed failed to make a polygon.
Is there a way to get around this problem? I have tried many different things including GPS Tools, Batch GPS Importer, Merging layers, Fixing geometries. I have run out of ideas.
As requested by Erik:
Here is an example track:
I can polygonize the "loop" manually - but not with the Graphical Modeler:
The Graphical Model:
Sample GPX (of a shorter track) made with the same GPX tracker:
<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/1" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd" version="1.1" creator="Open GPX Tracker for iOS">
<trk>
<trkseg>
<trkpt lat="50.92371170879427" lon="0.7082069478935639">
<ele>1.6512947082519531</ele>
<time>2020-05-16T15:12:17Z</time>
</trkpt>
<trkpt lat="50.923746284144855" lon="0.7085257116711777">
<ele>17.26394271850586</ele>
<time>2020-05-16T15:12:18Z</time>
</trkpt>
<trkpt lat="50.9237622516704" lon="0.7084496039903802">
<ele>36.04580307006836</ele>
<time>2020-05-16T15:12:20Z</time>
</trkpt>
<trkpt lat="50.92375919227574" lon="0.7084884960210961">
<ele>35.53786849975586</ele>
<time>2020-05-16T15:12:22Z</time>
</trkpt>
<trkpt lat="50.923756803433335" lon="0.7085274718708438">
<ele>33.56557846069336</ele>
<time>2020-05-16T15:12:23Z</time>
</trkpt>
<trkpt lat="50.92375382785771" lon="0.7085764221853657">
<ele>33.50826644897461</ele>
<time>2020-05-16T15:12:24Z</time>
</trkpt>
<trkpt lat="50.92374808625404" lon="0.7086478360003872">
<ele>33.09322738647461</ele>
<time>2020-05-16T15:12:25Z</time>
</trkpt>
<trkpt lat="50.923741632188595" lon="0.7087280508137389">
<ele>33.21499252319336</ele>
<time>2020-05-16T15:12:26Z</time>
</trkpt>
<trkpt lat="50.923732915009296" lon="0.7088175695396111">
<ele>33.34707260131836</ele>
<time>2020-05-16T15:12:27Z</time>
</trkpt>
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<ele>32.77730941772461</ele>
<time>2020-05-16T15:12:28Z</time>
</trkpt>
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<ele>33.23983383178711</ele>
<time>2020-05-16T15:12:29Z</time>
</trkpt>
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<ele>33.10921859741211</ele>
<time>2020-05-16T15:12:30Z</time>
</trkpt>
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<ele>32.85805892944336</ele>
<time>2020-05-16T15:12:31Z</time>
</trkpt>
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<ele>32.01839828491211</ele>
<time>2020-05-16T15:12:32Z</time>
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<ele>31.03518295288086</ele>
<time>2020-05-16T15:12:33Z</time>
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<ele>30.08053207397461</ele>
<time>2020-05-16T15:12:34Z</time>
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<ele>29.83437728881836</ele>
<time>2020-05-16T15:12:35Z</time>
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<ele>29.83669662475586</ele>
<time>2020-05-16T15:12:36Z</time>
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<ele>28.89907455444336</ele>
<time>2020-05-16T15:12:37Z</time>
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<ele>28.59688949584961</ele>
<time>2020-05-16T15:12:38Z</time>
</trkpt>
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<ele>27.77956771850586</ele>
<time>2020-05-16T15:12:39Z</time>
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<ele>27.08919906616211</ele>
<time>2020-05-16T15:12:40Z</time>
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<time>2020-05-16T15:12:41Z</time>
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<ele>26.22274398803711</ele>
<time>2020-05-16T15:12:42Z</time>
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<time>2020-05-16T15:12:43Z</time>
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<time>2020-05-16T15:12:44Z</time>
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<time>2020-05-16T15:12:45Z</time>
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<time>2020-05-16T15:12:49Z</time>
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<time>2020-05-16T15:12:51Z</time>
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<time>2020-05-16T15:12:52Z</time>
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<time>2020-05-16T15:12:53Z</time>
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<time>2020-05-16T15:12:54Z</time>
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<time>2020-05-16T15:12:55Z</time>
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<time>2020-05-16T15:12:56Z</time>
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<time>2020-05-16T15:12:57Z</time>
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<time>2020-05-16T15:12:58Z</time>
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<time>2020-05-16T15:12:59Z</time>
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<time>2020-05-16T15:13:00Z</time>
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<time>2020-05-16T15:13:01Z</time>
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Data Log: With QGIS Graphical Modeler:
Prepare algorithm: qgis:polygonize_1
Running Polygonize [1/6]
Input Parameters:
{ INPUT: '/Users/peqi/Downloads/GPX/16-May-2020-1531.gpx', KEEP_FIELDS: False, OUTPUT: 'memory:Polygons from lines' }
Processing lines…
Noding lines…
Polygonizing…
No polygons were created!
OK. Execution took 0.165 s (1 outputs).
Manually:
Processing algorithm…
Algorithm 'Polygonize' starting…
Input parameters:
{ 'INPUT' : '/Users/peqi/Downloads/GPX/16-May-2020-1531.gpx|layername=tracks', 'KEEP_FIELDS' : False, 'OUTPUT' : 'TEMPORARY_OUTPUT' }
Processing lines…
Noding lines…
Polygonizing…
Saving polygons…
Execution completed in 0.10 seconds
Results:
{'OUTPUT': 'Polygons_from_lines_44578c71_16a0_40b5_827e_a6ce3393bfe5'}
Loading resulting layers
Algorithm 'Polygonize' finished
Model script: https://pastebin.com/m8uSnARj
Compare manual input:
'INPUT' : '/Users/peqi/Downloads/GPX/16-May-2020-1531.gpx|layername=tracks'
with the Model:
{ INPUT: '/Users/peqi/Downloads/GPX/16-May-2020-1615.gpx', KEEP_FIELDS: False, OUTPUT: 'memory:Polygons from lines' }
Is that missing '... |layername=tracks' the problem?
