Discussion in 'Aerial Photography' started by 480sparky, Jul 9, 2016.
Wouldn't you have to also know the exact details of the older photo? i.e. lens focal length?
Get up on the wrong side of the cave this morning did we? I'm pretty sure I stated that I don't think it's possible with any accuracy. Another way to state that is, "I believe that this can be done, but the result won't be accurate".
I think you could make some calculations by trying some different focal lengths that might have been popular for such a photo.
You can calculate the scale based on the distances in the photo and the actual distances. Then you can use that scale and using an assumed focal length (and probably need to figure in the negative size and if any enlargement was done when making the prints) and can then solve for the altitude.
Here is a page with some sample calculations...
This is another article that uses the known focal length/sensor size of the GoPro to do similar calculation of altitude...
How to calculate altitude from a aerial photography taken with a GoPro3be.
I guess it depends a bit on just how accurate you need to be in this calculation. Sounds like a fun project.
Make a transparency of the roads or hoards that are still there and put it over your viewing screen?
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