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Thread: Measuring bearing from photos with reference objects

  1. #1
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    Question Measuring bearing from photos with reference objects

    I have a rather simple photo, with two buildings and one target.

    Measuring bearing from photos with reference objects-photo-example.png

    I know the bearings of the two buildings from the observer (θ1, θ2), thus the angle between the two buildings are known (θ = θ2-θ1). I can measure the "distance" between the two buildings in the photo (D, in pixel), and the "distance" between the target and building 1 (d).
    Does the bearing of the target can be calculated as simple as θ1 + (θ * d/D) ?
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  2. #2
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    Re: Measuring bearing from photos with reference objects

    So the red five-pointed star is the "target"? And you are looking at it from some other location? The bearing to the target will also depend upon the distance the target is back from the two buildings so your formula, which only uses "horizontal" distances cannot be correct.
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  3. #3
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    Re: Measuring bearing from photos with reference objects

    HallsofIvy, thank you of the reply. Could you please explain to me why the distance the object is "back" matters? I think all objects on the same vertical line through the star (while projected on a photo, despite of the "depth") shall have the same bearing?
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