i have a photograph of a room, can i tell the legnth of a wall from it?

Question

i have a photo of a room taken at an angle along one wall.
i konw the ceiling height an some other measurements, can i work out the legnth of the wall from this photo?
i dont want to go back to remeasure if i can avoid it.

the problem is that the wall is at an angle in the photo going away from the camera so the ways sugested so far wont work

Answer 1

Yeah, you could get a really close estimate. Take a ruler and measure what the ceiling height is on the ruler, figure out the percentage and multiply it out. Take the room width and then follow the same formula.

Answer 2

Possibly - if you can determine the scale of the picture by measuring the ceiling height, you can simply measure the length of the wall in the picture, and then calculate how long it actually is.

For example, if you know the ceiling is 9' (108") high, and you measure it on the picture and it is 9", then you have a ratio of 1:12, if you measure the wall on the picture and it is 12 inches, then you know that it is actually 12' (144").

If you want to be 100% accurate, then go back and measure it, but if you are just getting an estimate, then this will work.

Answer 3

If the picture was taken at an angle to the wall, and you don't know that angle, then you can't work out the length of the room simply by scaling from the ceiling height. You need to know the length of something that is parallel to the wall, and then scale from that.

Answer 4

No you can't. You have to know what angle the photo was taken at with respect to the wall. Unless you know this you're only guessing.

Answer 5

If you know the camera details I think you can determine the length using photogrammetry techniques.
Probably much easier to re-measure it.

Answer 6

if you were my estate agent id disinstruct!! get back round you lazy sod. ( cheat for measuring gardens all fence pannels are 6")