Elevation gain/loss

[jpmens]

I think there's a bug in Frontend which was initially mentioned in #129: the calculation of elevation gain/loss is wrong.

The data hereunder is for this portion of the map in which Frontend says +794m and - 899m

This is a route taken with one of our qtripp devices which reports OwnTracks data. The data is obtained with the Recorder API:

$ curl -sSf 'http://127.0.0.1:8083/api/0/locations?from=2024-11-09T10%3A00%3A00&to=2024-11-09T11%3A00%3A59&user=qtripp&device=redacted'| gron | egrep -v 'driver|plate|odometer|cid|count|din[12]|dout[12]|fake|ign|mcc|mnc|motion|rid|rit|rty|sen[st]|tow' | gron -u | jq . > data.json

data for the 252 positions attached in next comment.

$ gron data.json | grep alt | awk -F '[=;]' '{print $2 }' | sort -n
 23.4
...
 131.2

The Booklet specifies alt (altitude) is optional, but it appears as though a value of 0 is assumed if not available. In spite of that, there must be something else wrong, as this particular data set has an altitude on each position.

Frontend: 2.15.3
Recorder: 0.9.9

[jpmens]

data.json

[linusg]

In spite of that, there must be something else wrong, as this particular data set has an altitude on each position.

That's not true:

>>> import json
>>> with open("data.json", encoding="utf-8") as f:
...     data = json.load(f)
...
>>> for d in data["data"]:
...     if "alt" not in d:
...         print(d)
...
{'_type': 'location', 'addr': 'A 30, 49082 Osnabrück, Germany', 'cc': 'DE', 'cog': 264, 'disptst': '2024-11-09 10:04:37', 'ghash': 'u1m9pqv', 'isolocal': '2024-11-09T11:04:37+0100', 'isorcv': '2024-11-09T10:04:37Z', 'isotst': '2024-11-09T10:04:37Z', 'lat': 52.244615, 'lon': 8.060427, 't': 'p', 'tid': '53', 'tst': 1731146677, 'vel': 84.2}
{'_type': 'location', 'addr': 'A 30, 49082 Osnabrück, Germany', 'cc': 'DE', 'cog': 264, 'disptst': '2024-11-09 10:04:37', 'ghash': 'u1m9pqv', 'isolocal': '2024-11-09T11:04:37+0100', 'isorcv': '2024-11-09T10:04:37Z', 'isotst': '2024-11-09T10:04:37Z', 'lat': 52.244615, 'lon': 8.060427, 't': 'p', 'tid': '53', 'tst': 1731146677, 'vel': 84.2}
{'_type': 'location', 'addr': 'A30, 49078 Osnabrück, Germany', 'cc': 'DE', 'cog': 264, 'disptst': '2024-11-09 10:09:40', 'ghash': 'u1m9me2', 'isolocal': '2024-11-09T11:09:40+0100', 'isorcv': '2024-11-09T10:09:40Z', 'isotst': '2024-11-09T10:09:40Z', 'lat': 52.268936, 'lon': 7.976264, 't': 'p', 'tid': '53', 'tst': 1731146980, 'vel': 83.8}
{'_type': 'location', 'addr': 'A30, 49078 Osnabrück, Germany', 'cc': 'DE', 'cog': 264, 'disptst': '2024-11-09 10:09:40', 'ghash': 'u1m9me2', 'isolocal': '2024-11-09T11:09:40+0100', 'isorcv': '2024-11-09T10:09:40Z', 'isotst': '2024-11-09T10:09:40Z', 'lat': 52.268936, 'lon': 7.976264, 't': 'p', 'tid': '53', 'tst': 1731146980, 'vel': 83.8}
{'_type': 'location', 'addr': 'A 1, 49504 Lotte, Germany', 'cc': 'DE', 'cog': 32, 'disptst': '2024-11-09 10:14:43', 'ghash': 'u1m9sgr', 'isolocal': '2024-11-09T11:14:43+0100', 'isorcv': '2024-11-09T10:14:43Z', 'isotst': '2024-11-09T10:14:43Z', 'lat': 52.314024, 'lon': 7.952775, 't': 'p', 'tid': '53', 'tst': 1731147283, 'vel': 123.1}
{'_type': 'location', 'addr': 'A 1, 49504 Lotte, Germany', 'cc': 'DE', 'cog': 32, 'disptst': '2024-11-09 10:14:43', 'ghash': 'u1m9sgr', 'isolocal': '2024-11-09T11:14:43+0100', 'isorcv': '2024-11-09T10:14:43Z', 'isotst': '2024-11-09T10:14:43Z', 'lat': 52.314024, 'lon': 7.952775, 't': 'p', 'tid': '53', 'tst': 1731147283, 'vel': 123.1}
{'_type': 'location', 'addr': 'Hansalinie, 49565 Bramsche, Germany', 'cc': 'DE', 'cog': 349, 'disptst': '2024-11-09 10:19:31', 'ghash': 'u1mdp00', 'isolocal': '2024-11-09T11:19:31+0100', 'isorcv': '2024-11-09T10:19:31Z', 'isotst': '2024-11-09T10:19:31Z', 'lat': 52.384118, 'lon': 8.042671, 't': 'p', 'tid': '53', 'tst': 1731147571, 'vel': 112.8}
{'_type': 'location', 'addr': 'Hansalinie, 49565 Bramsche, Germany', 'cc': 'DE', 'cog': 349, 'disptst': '2024-11-09 10:19:31', 'ghash': 'u1mdp00', 'isolocal': '2024-11-09T11:19:31+0100', 'isorcv': '2024-11-09T10:19:31Z', 'isotst': '2024-11-09T10:19:31Z', 'lat': 52.384118, 'lon': 8.042671, 't': 'p', 'tid': '53', 'tst': 1731147571, 'vel': 112.8}
{'_type': 'location', 'addr': 'A 1, 49597 Rieste, Germany', 'cc': 'DE', 'cog': 24, 'disptst': '2024-11-09 10:24:58', 'ghash': 'u1mdrpq', 'isolocal': '2024-11-09T11:24:58+0100', 'isorcv': '2024-11-09T10:24:58Z', 'isotst': '2024-11-09T10:24:58Z', 'lat': 52.466728, 'lon': 8.051433, 't': 'p', 'tid': '53', 'tst': 1731147898, 'vel': 102.5}
{'_type': 'location', 'addr': 'A 1, 49597 Rieste, Germany', 'cc': 'DE', 'cog': 24, 'disptst': '2024-11-09 10:24:58', 'ghash': 'u1mdrpq', 'isolocal': '2024-11-09T11:24:58+0100', 'isorcv': '2024-11-09T10:24:58Z', 'isotst': '2024-11-09T10:24:58Z', 'lat': 52.466728, 'lon': 8.051433, 't': 'p', 'tid': '53', 'tst': 1731147898, 'vel': 102.5}
{'_type': 'location', 'addr': 'A 1, 49434 Neuenkirchen-Vörden, Germany', 'cc': 'DE', 'cog': 26, 'disptst': '2024-11-09 10:29:28', 'ghash': 'u1mfb3x', 'isolocal': '2024-11-09T11:29:28+0100', 'isorcv': '2024-11-09T10:29:28Z', 'isotst': '2024-11-09T10:29:28Z', 'lat': 52.522921, 'lon': 8.106595, 't': 'p', 'tid': '53', 'tst': 1731148168, 'vel': 99.3}
{'_type': 'location', 'addr': 'A 1, 49434 Neuenkirchen-Vörden, Germany', 'cc': 'DE', 'cog': 26, 'disptst': '2024-11-09 10:29:28', 'ghash': 'u1mfb3x', 'isolocal': '2024-11-09T11:29:28+0100', 'isorcv': '2024-11-09T10:29:28Z', 'isotst': '2024-11-09T10:29:28Z', 'lat': 52.522921, 'lon': 8.106595, 't': 'p', 'tid': '53', 'tst': 1731148168, 'vel': 99.3}
{'_type': 'location', 'addr': 'A 1, 49451 Holdorf, Germany', 'cc': 'DE', 'cog': 16, 'disptst': '2024-11-09 10:34:28', 'ghash': 'u1mg0xh', 'isolocal': '2024-11-09T11:34:28+0100', 'isorcv': '2024-11-09T10:34:28Z', 'isotst': '2024-11-09T10:34:28Z', 'lat': 52.597233, 'lon': 8.113896, 't': 'p', 'tid': '53', 'tst': 1731148468, 'vel': 98.5}
{'_type': 'location', 'addr': 'A 1, 49451 Holdorf, Germany', 'cc': 'DE', 'cog': 16, 'disptst': '2024-11-09 10:34:28', 'ghash': 'u1mg0xh', 'isolocal': '2024-11-09T11:34:28+0100', 'isorcv': '2024-11-09T10:34:28Z', 'isotst': '2024-11-09T10:34:28Z', 'lat': 52.597233, 'lon': 8.113896, 't': 'p', 'tid': '53', 'tst': 1731148468, 'vel': 98.5}
{'_type': 'location', 'addr': 'Hansalinie, 49393 Lohne, Germany', 'cc': 'DE', 'cog': 14, 'disptst': '2024-11-09 10:39:37', 'ghash': 'u1mg9g7', 'isolocal': '2024-11-09T11:39:37+0100', 'isorcv': '2024-11-09T10:39:37Z', 'isotst': '2024-11-09T10:39:37Z', 'lat': 52.665668, 'lon': 8.167313, 't': 'p', 'tid': '53', 'tst': 1731148777, 'vel': 99.1}
{'_type': 'location', 'addr': 'Hansalinie, 49393 Lohne, Germany', 'cc': 'DE', 'cog': 14, 'disptst': '2024-11-09 10:39:37', 'ghash': 'u1mg9g7', 'isolocal': '2024-11-09T11:39:37+0100', 'isorcv': '2024-11-09T10:39:37Z', 'isotst': '2024-11-09T10:39:37Z', 'lat': 52.665668, 'lon': 8.167313, 't': 'p', 'tid': '53', 'tst': 1731148777, 'vel': 99.1}
{'_type': 'location', 'addr': 'A 1, 49456 Bakum, Germany', 'cc': 'DE', 'cog': 16, 'disptst': '2024-11-09 10:44:58', 'ghash': 'u1mu44u', 'isolocal': '2024-11-09T11:44:58+0100', 'isorcv': '2024-11-09T10:44:58Z', 'isotst': '2024-11-09T10:44:58Z', 'lat': 52.749719, 'lon': 8.1801, 't': 'p', 'tid': '53', 'tst': 1731149098, 'vel': 84.7}
{'_type': 'location', 'addr': 'A 1, 49456 Bakum, Germany', 'cc': 'DE', 'cog': 16, 'disptst': '2024-11-09 10:44:58', 'ghash': 'u1mu44u', 'isolocal': '2024-11-09T11:44:58+0100', 'isorcv': '2024-11-09T10:44:58Z', 'isotst': '2024-11-09T10:44:58Z', 'lat': 52.749719, 'lon': 8.1801, 't': 'p', 'tid': '53', 'tst': 1731149098, 'vel': 84.7}
{'_type': 'location', 'addr': 'Hansalinie, 49685 Emstek, Germany', 'cc': 'DE', 'cog': 9, 'disptst': '2024-11-09 10:49:43', 'ghash': 'u1mudbh', 'isolocal': '2024-11-09T11:49:43+0100', 'isorcv': '2024-11-09T10:49:43Z', 'isotst': '2024-11-09T10:49:43Z', 'lat': 52.823538, 'lon': 8.213636, 't': 'p', 'tid': '53', 'tst': 1731149383, 'vel': 118}
{'_type': 'location', 'addr': 'Hansalinie, 49685 Emstek, Germany', 'cc': 'DE', 'cog': 9, 'disptst': '2024-11-09 10:49:43', 'ghash': 'u1mudbh', 'isolocal': '2024-11-09T11:49:43+0100', 'isorcv': '2024-11-09T10:49:43Z', 'isotst': '2024-11-09T10:49:43Z', 'lat': 52.823538, 'lon': 8.213636, 't': 'p', 'tid': '53', 'tst': 1731149383, 'vel': 118}
{'_type': 'location', 'addr': 'A 1, 26197 Großenkneten, Germany', 'cc': 'DE', 'cog': 74, 'disptst': '2024-11-09 10:54:52', 'ghash': 'u1muugu', 'isolocal': '2024-11-09T11:54:52+0100', 'isorcv': '2024-11-09T10:54:52Z', 'isotst': '2024-11-09T10:54:52Z', 'lat': 52.88743, 'lon': 8.300847, 't': 'p', 'tid': '53', 'tst': 1731149692, 'vel': 110}
{'_type': 'location', 'addr': 'A 1, 26197 Großenkneten, Germany', 'cc': 'DE', 'cog': 74, 'disptst': '2024-11-09 10:54:52', 'ghash': 'u1muugu', 'isolocal': '2024-11-09T11:54:52+0100', 'isorcv': '2024-11-09T10:54:52Z', 'isotst': '2024-11-09T10:54:52Z', 'lat': 52.88743, 'lon': 8.300847, 't': 'p', 'tid': '53', 'tst': 1731149692, 'vel': 110}
{'_type': 'location', 'addr': 'A 1, 27801 Dötlingen, Germany', 'cc': 'DE', 'cog': 88, 'disptst': '2024-11-09 10:59:22', 'ghash': 'u1mvp8b', 'isolocal': '2024-11-09T11:59:22+0100', 'isorcv': '2024-11-09T10:59:22Z', 'isotst': '2024-11-09T10:59:22Z', 'lat': 52.914294, 'lon': 8.41605, 't': 'p', 'tid': '53', 'tst': 1731149962, 'vel': 91.5}
{'_type': 'location', 'addr': 'A 1, 27801 Dötlingen, Germany', 'cc': 'DE', 'cog': 88, 'disptst': '2024-11-09 10:59:22', 'ghash': 'u1mvp8b', 'isolocal': '2024-11-09T11:59:22+0100', 'isorcv': '2024-11-09T10:59:22Z', 'isotst': '2024-11-09T10:59:22Z', 'lat': 52.914294, 'lon': 8.41605, 't': 'p', 'tid': '53', 'tst': 1731149962, 'vel': 91.5}

...so I assume including the fallback to 0 in the calculations is the issue here. Will look into fixing this, thanks for the detailed report :)

[jpmens]

has an altitude on each position

is indeed untrue; it wasn't my intention to give alternate facts. :)