TracePoint: A Browser-Based Tool for Image Geolocation by Ray Intersection

TracePoint: A Browser-Based Tool for Image Geolocation by Ray Intersection

m

May 25, 2026

Geolocating a photograph without embedded GPS data is a recurring challenge in open source investigation, field verification, and conflict documentation. When metadata is absent or stripped, analysts must work from visible landmarks, architectural features, and terrain to determine where an image was taken.
One geometrically rigorous approach is ray intersection: bearing lines, each anchored to two identifiable landmarks on a map, converge at the camera position. The technique is well established in surveying and land navigation, but its application to open source image analysis has until now relied on manual, split-screen workflows and informal geometry.
TracePoint, developed by EAGLE alumnus Pawel Kluter (github.com/kluter), formalises this workflow as an open-source, browser-based tool. The inital development started during his EAGLE studies but he continued to develop him after he graduated. The tools works in a way, that an analyst places geo-referenced bearing lines on a satellite or street-level map, anchored to landmarks visible in the source image, and reads off the camera position at their intersection. Adding further lines generates a confidence ellipse around the result, visualising the spread of ray crossings and the reliability of the estimate.
The tool requires no installation and no image upload. An integrated EXIF viewer reads camera metadata and, where present, GPS coordinates and camera direction, placing a reference marker on the map alongside the geometric result. Multiple images can be worked within a single session, with bearing lines from different photographs placed simultaneously on one map.
TracePoint has been accepted into jivoi/awesome-osint (github.com/jivoi/awesome-osint), one of the most widely referenced open source intelligence resource collections on GitHub with over 25,000 stars, and into The-Osint-Toolbox/Geolocation-OSINT (github.com/The-Osint-Toolbox/Geolocation-OSINT), a dedicated geolocation resource list.

check it out:

follow us and share it on:

you may also like:

DBU scholar Josipa Subotic

DBU scholar Josipa Subotic

Almost a year ago, Josipa Subotic showed up at EORC as a DBU scholar, and now her stay with us is coming to an end. Josipa spent her time digging into snow cover properties around the Zugspitze, working with Sentinel-2 time series data. Multispectral imagery, lots of...

GLS-team visits Planetary Health exhibition

GLS-team visits Planetary Health exhibition

One of the aims of Geolingual Studies Geolingual Studies - Geolingual Studies is to ensure effective science communication beyond the scientific community and into the wider society. The Geolingual Studies team was given the opportunity to look at concepts and methods...

University press covered our anniversaries

University press covered our anniversaries

Einblick, the University of Würzburg's press medium, published an article on our double anniversary, 25 years of Earth observation research and 10 years of EAGLE M.Sc. program, today. Recently, they has visited us at our EORC to hear about our research and teaching...

Mapping Lava Tubes on Mauritius with iPhone Pro LiDAR

Mapping Lava Tubes on Mauritius with iPhone Pro LiDAR

Lava tube structures on Mauritius are quite hard to survey - tight, dark, and largely inaccessible to classical scanning equipment. As part of ongoing research by Dr. Kim Lea Holzmann (Chair of Animal Ecology and Tropical Biology, University of Würzburg), we're...

Johannes Mast wins Bernd Rendel Prize

Johannes Mast wins Bernd Rendel Prize

Johannes Mast is awarded the 2026 Bernd Rendel Prize for Geosciences by the Deutsche Forschungsgemeinschaft (DFG) for outstanding research as part of his dissertation. Johannes’s highly interdisciplinary work bridges the Geosciences, Linguistics, Data Science, and...

Privacy Policy

Lehrstuhl für Fernerkundung & Lehrstuhl für Urbane Fernerkundung

Erdbeobachtung an der Universität Würzburg

Share This