Fair question, and deserves an answer ~
A lot of wartime shots like this look the same - as in, "How in the _______ can you tell where a particular shot is located?" With many shots, you can't. With Debden, however, for those of us intimately familiar with the wartime layout there are more than enough clues to pinpoint the location
in this photograph with a fair degree of confidence:
1) It's a 335 kite. That narrows the location on the field - if you know where they parked.
2) No hangars, watch office (control tower), or any of the technical site buildings in the background. Narrows the direction.
3) 335 had only one "offset" two-ship bay (we're getting close).
4) Abbotts Farm in the background (a dead giveaway).
5) 334 parking just where it should be from this direction - right in front of Abbotts Farm. Also, if you look closely (granted, I have a larger image available to me) you can see the N-S runway and peri-track from which I took the ground shot in 2002.
6) And finally, I spent almost a year before my 2002 trip going through every 4th FG photo and airfield diagram I could lay my hands on trying to triangulate details in order to take as many "then and now" shots as I could for my website. I thought I was only going to have one afternoon on the field, so I wanted to be sure of where I needed to be with minimum fuss. As it turned out I had three days, so I got a truckload of pics over and above what I had planned on. I brought cheap photocopies of my "then" shots with me as 'guides'.
As an aside, a few months after my trip we were at Dayton for the 4th FG memorial dedication at the USAF Museum. We were watching a neat film taken by one of the vets from a P-47 if I recall correctly (you could see the wing in the film) as it flew around the airfield. There was some discussion about exactly where a certain portion of the field was located. I looked at it and said, "The film's backwards". The guy who was showing the film, a son of the vet - or one of the veterans - got red-faced and angry at me for daring to challenge him (after all, who was I but an enthusiast?) ... but I was so recently familiar with the field that I *knew* I was right. Not only did I know the film, but I knew the Jugs didn't carry the national insignia on the top of the RIGHT wing!

The discussion came to an end - and we ended up as friends ...
Hope that answers your question.
Wade