gpx1.1 KB

GPX — Track Without Timestamps

The same eight points with elevation but no `time` element — what you get when a track is drawn in a planning tool rather than recorded. Speed and pace calculations must refuse to produce a number here instead of dividing by a zero duration.

Geospatial Error handling Time-series data

Preview — first 38 linesgpx

<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" creator="Novus Examples geospatial fixtures" xmlns="http://www.topografix.com/GPX/1/1">
  <metadata>
    <name>Kestrel Bay Coast Road</name>
    <desc>Synthetic GPS trace over an invented territory.</desc>
    <time>2026-01-01T09:00:00Z</time>
  </metadata>
  <trk>
    <name>Coast Road, untimed</name>
    <trkseg>
      <trkpt lat="47.064024" lon="-12.482008">
        <ele>12.1</ele>
      </trkpt>
      <trkpt lat="47.066181" lon="-12.478086">
        <ele>18.9</ele>
      </trkpt>
      <trkpt lat="47.068297" lon="-12.474186">
        <ele>24.8</ele>
      </trkpt>
      <trkpt lat="47.070538" lon="-12.470269">
        <ele>30.5</ele>
      </trkpt>
      <trkpt lat="47.072646" lon="-12.466428">
        <ele>36.7</ele>
      </trkpt>
      <trkpt lat="47.074851" lon="-12.462489">
        <ele>41.5</ele>
      </trkpt>
      <trkpt lat="47.077037" lon="-12.458586">
        <ele>46.1</ele>
      </trkpt>
      <trkpt lat="47.079139" lon="-12.45468">
        <ele>49.4</ele>
      </trkpt>
    </trkseg>
  </trk>
</gpx>

Specifications

Crs: WGS 84 (EPSG:4326)
Encoding: UTF-8
Line Endings: LF
Seed: 20260807
Jitter Sigma Degrees: 0.000025
Start Time: 2026-01-01T09:00:00Z
Sample Interval Seconds: 15
Format: GPX 1.1
Trackpoints: 8
Has Elevation: true
Has Time: false
Reason: track exported from a planning tool, never recorded

Testing contract

Expected to pass

Scenario: Compute average speed for the track.
Expected result: The tool reports that speed cannot be derived without timestamps; it does not return infinity, zero, or a value derived from a guessed interval.

What is a .gpx file?

GPX (GPS Exchange Format) is an XML schema for GPS data, storing waypoints, routes, and tracks with coordinates, elevation, and timestamps. It is the standard interchange format for GPS devices and fitness and navigation apps. Track points capture recorded movement over time.

How to use this file

Use an example GPX file to test GPS track parsing, elevation and timestamp handling, and tools that import routes or visualize recorded activity.

How to use this file for testing

“GPX — Track Without Timestamps” is a deterministic Novus Examples fixture for Geospatial, Error handling, Time-series data. GeoJSON, GPX, and KML files with points, lines, polygons, and tracks — for testing map tools, route parsers, and geo importers.

Documented properties for this file: seed 20260807 · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.

Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.

Geospatial fixtures publish one invented territory across formats, with the coordinate reference system and feature counts documented in specs. Convert or reproject and diff against the twin in the same group; edge-case geometries state exactly which assumption they are built to break.

Code examples

import gpxpy  # pip install gpxpy

with open("gpx-no-time.gpx") as f:
    gpx = gpxpy.parse(f)
print(sum(len(t.segments) for t in gpx.tracks), "segments")