Photos to scale

Joined
Aug 9, 2015
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South Africa
Hey everyone

A client wants me to photograph traffic intersections with the view of using the information for planning and design purposes.
Snag is... They want the pictures to scale...
I can see virtically down images will probably be easier to scale afterwards, if you place a known size object on the ground...
Then I have to work on the angle of tall structures like lamp posts - on a previous assignment I noticed the electrical overhead line poles were all at an angle except the one absolutely directly below the camera.

But where to start...

Suggestions welcome!