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To geotag photos from a GPX track, match each photo’s capture time to a time-stamped position in the track, correct any camera-to-GPS clock or time-zone offset, then write and verify the coordinates. ExifTool is a practical choice for batch edits; Lightroom Classic offers a map-based route, and Mapillary Tools is designed for imagery prepared for Mapillary.
What you need before matching photos to a track
A GPX file does not say which location belongs to which image. The geotagging software pairs the image’s capture time with a nearby, time-stamped track position; it may interpolate between track fixes. The result depends on the photo timestamps and track times lining up.
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- A time-stamped GPX track: Confirm that the file contains recorded positions with times, not just a route without timed fixes. GPX is a broadly useful exchange format; Mapillary’s guidance calls it the most standard option and recommends checking whether a device can export it (Mapillary’s separate-GPS-device guide).
- Photos with usable capture times: Check that the image files have accurate capture-time metadata. Mapillary Tools documents matching with EXIF
Date/Time OriginalorGPS Date/Time(Mapillary Tools README). - An accurate time relationship: GPS track times are UTC, while cameras often record local time. Know the camera’s time zone and whether its clock was set correctly; otherwise, determine the offset before writing coordinates.
- Untouched originals: Keep a separate copy before batch-editing metadata so you can recover if the time offset or track selection is wrong.
Choose a geotagging workflow
| Workflow | Best fit | Considerations |
|---|---|---|
| ExifTool | Batch edits, automation, or a directory of images | Command-line tool. Its documentation lists GPX and other track formats, including NMEA, KML, IGC, Garmin XML/TCX, and FIT. You need to handle time correction and file rewrite behavior. |
| Lightroom Classic Map module | Photographers already managing images in Lightroom Classic | A specialist guide describes loading a GPX file and tagging selected photos. Adobe’s current interface and exact steps are not established here, so check the documentation for the version you use before following a click-by-click guide. |
| Mapillary Tools | Images being prepared for Mapillary | Supports GPX matching and an interpolation time-offset option. This is a platform-oriented workflow, not a general photo-library catalog workflow; its documented image-time fields are Date/Time Original or GPS Date/Time. |
For any tool, consider whether it writes coordinates into the image files or keeps edits in a catalog, how it handles time zones and offsets, what input formats it accepts, and how it protects originals. Do not assume one workflow is best for every library or operating system.
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Geotag a small batch with ExifTool
ExifTool’s official documentation describes adding GPS tags from a GPS track log and supports GPX input. This example matches using the image’s EXIF CreateDate field:
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exiftool -geotag track.gpx "-geotime<createdate" -P image.jpgReplace track.gpx and image.jpg with your paths. You can provide a directory instead of a single image to process a batch. The -P option preserves the file modification date during rewriting; without it, ExifTool updates that date. See ExifTool’s geotagging documentation for its supported options, time handling, and formats.
- Check timestamps first. Compare the photo’s capture time with the GPX track’s time range. Confirm the camera’s time zone and clock setting, and identify any known difference from GPS time.
- Test a few images. Include photos from the start and end of the track, as well as any taken around a clock adjustment or time-zone change. A short test makes a wrong offset easier to catch before a large write.
- Apply the known correction. ExifTool supports explicit time-zone values and
Geosyncfor correcting clock differences. Mapillary Tools provides--interpolation_offset_timein seconds. Use a correction based on the actual camera/GPS difference rather than guessing. - Write coordinates and inspect results. Check the metadata and map position of representative files before processing or uploading the rest. For JPG/JPEG uploads, Mapillary’s guidance requires GPS longitude and latitude in addition to the applicable capture-time metadata.
Why matching can fail or produce the wrong place
Every photo is displaced by roughly the same amount
A consistent shift usually points to a time-zone or camera-clock offset. Compare the EXIF capture time with the GPX timestamps and correct the known difference. Since GPS times are UTC and camera times may be local, applying a guessed offset can move every image to the wrong place.
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Only some photos receive coordinates
Check for missing capture-time metadata, images taken outside the track’s recorded interval, and long gaps between track fixes. ExifTool interpolates linearly between track points, but its default maximum time distance is one half hour; its options let you configure this limit. A photo outside the usable interval or beyond the allowed gap may not get a position.
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Confirm that the GPX file is from the same trip and date. Then compare track timestamps with image metadata, checking for camera clock drift, a date rollover, or a time-zone interpretation error before rerunning the write.
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File modification dates changed
ExifTool updates FileModifyDate when rewriting files unless you use -P. This concerns the file’s modification date, which is distinct from the capture time used for matching.
If you still need to record a track
A phone with a GPS-tracking app or an external GPS device can record the route; confirm that the device or app exports GPX. Mapillary’s guide gives OsmAnd trip recording as an example. A dedicated GPS data logger is optional, not a requirement. For Mapillary Tools specifically, the relevant workflow is intended for imagery prepared for that platform rather than general photo-library cataloging.
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