I have an old photo (taken in 1909) that I have determined precisely where (relative to the ground) it was taken from, but I'm wondering if it's possible to use the features in the image to mathematically calculate the height at which it was taken from. I have positively identified 6 houses that are still standing (easy to do with Google street view), so the latitude and longitude are easily determined. But I'm wondering if there's a way, using the know distances between these houses, to figure out how high the camera was when it took the image. Here is the image: The houses with the red dots are still standing. The image was taken from above this location.