Can you estimate a photo’s shooting location without GPS EXIF using visible landmarks?
Asked 9/25/2024
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I have an image with no GPS metadata, but the EXIF does include lens/camera information. In the photo there are identifiable landscape features such as hills, mountains, and islands whose positions are known from mapping software like Google Earth. I also know the camera’s approximate position and general shooting direction. Is it possible to georeference the image and estimate where the camera was located, and what method gives the best positional accuracy?
Originally by rox. Source · Licensed CC BY-SA 4.0
rox
1y ago
2 Answers
7
For maximum accuracy, you don't want trigonometry. What you want is a technique used in piloting:
- you find two things that are aligned (say, a house and the top of hill) which puts you on a straight line that goes through these two points, that you can draw on the map
- repeat above for another pair of things, that gives you a second linen that you can draw on the map.
- the camera was at the intersection of the two lines
- you can be more accurate with a third pair (the size of the triangle tells you how accurate you are)
Originally by xenoid. Source · Licensed CC BY-SA 4.0
xenoid
1y ago
0
Generated from our catalog & community — verify before relying on it.
Yes—if you can identify fixed landmarks in the image and on a map, you can estimate the camera position without GPS. The most useful method is to use bearings from aligned landmarks rather than relying on lens EXIF or simple trigonometry alone.
Pick two recognizable features that appear aligned from the camera’s viewpoint, then draw that line on the map through those two real-world points. That line represents a possible camera position. Do the same with a second pair of aligned features. The camera location is where the two lines intersect. A third pair can improve confidence: if the lines form a small triangle instead of meeting exactly, that triangle shows your likely error area.
In navigation this is commonly called resection/intersection; it’s closely related to triangulation. In practice, the accuracy depends on how precisely you can identify the landmarks, how well they align in the photo, and the quality of the map or terrain model. Lens EXIF may help estimate field of view, but the landmark-line method is the key to locating the shooting position.
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