GPS Correlate – add GPS locations to photographs

GPS Correlate matches the timestamp of a JPEG photograph with positions recorded in one or more GPX tracks. Once a match has been found, the program writes the geographical information into the photograph’s EXIF metadata so other software can recognise where the image was taken.

The usual workflow is simple: record a GPS track while taking photographs, copy both sets of files to the computer and let GPS Correlate compare their timestamps. It provides both command-line and graphical interfaces, so the same engine can be used interactively or as part of a scripted photography workflow.

This is free and open source software.

Key Features

• Matches JPEG photographs against timestamped points stored in GPX track files.
• Writes latitude, longitude and elevation into the appropriate EXIF GPS fields.
• Interpolates positions between neighbouring GPS points when an exact timestamp match is unavailable.
• Supports sub-second photo timing where the image metadata contains sufficient precision.
• Can limit matching when the nearest GPS observations are too far away in time.
• Handles camera clock differences with configurable time-zone and timestamp offsets.
• Can use time-zone information already stored in photograph metadata or ignore it when known to be incorrect.
• Writes movement heading and camera direction information when suitable track data are available.
• Can suppress direction tagging during sharp turns where interpolation would be unreliable.
• Displays existing GPS information already stored in photographs.
• Can output image location information as CSV or generate GPX data from already geotagged photographs.
• Removes GPS tags written by the program when geographical metadata is no longer wanted.
• Provides a dry-run mode for checking correlations without modifying image files.

Website: github.com/dfandrich/gpscorrelate
Support:
Developer: Dan Fandrich
License: GNU General Public License v2.0

GPS Correlate is written in C. Learn C with our recommended free books and free tutorials.

Related Software

Read our verdict in the software roundup.

Read our verdict in the software roundup.

Explore our carefully curated directory of recommended free and open source software, covering every major software category. The directory forms part of our extensive collection of articles for Linux enthusiasts. It includes hundreds of detailed reviews, together with free and open source alternatives to proprietary software from companies such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. LinuxLinks also covers interesting projects worth exploring, Linux-compatible hardware, free programming books and tutorials, and much more. Know a useful free and open source Linux application that we haven’t covered? Tell us about it using our submission form.