THE STREET-VIEW VIDEO CLIPS
"what about the people who DID capture private videos on 9/11"?
This "Electronic Jamming" thread has always been a controversial one, since it only postulates (on the basis of various reported electronic disruptions of the day) that military electronic jamming technology may have been employed to ensure that no one could capture video footage of the day. Was this technology used? If not, the question remains: WHERE ARE THE LEGIT AND AUTHENTIC private videos of the day? As a matter of fact, do we have any?
To be sure, the NIST FOIA video material released in 2010 contains many "never-seen-before" (i.e. prior to 2010) video clips which would appear - at first glance - to have been captured by the average "Joe Public On the Street". Yes, we DO now have several videos depicting people staring in awe from afar at the smoking towers - leaving us with the impression that thousands of New Yorkers had a "grandstand view" of the WTC drama - and that many amateur videographers were tranquilly strolling around on that sunny morning, mostly aiming their lenses at people's horrified faces and expressions...

The problem with these "9/11 street-view" video clips (which anyone can view on Youtube - just search for the various "NIST FOIA" 9/11 clips) is that whenever we are offered a view of the smoking WTC towers, they appear to have been digitally inserted into the scenery. To anyone with a keen eye for photography, they just look artificial and, well, fake. But that is - of course - no proof of anything. The question is: can we PROVE in a reasonably 'scientific' way that the towers were inserted in those street sceneries - as they seem to be at first glance?
Here we have a trio of images - apparently captured from slightly different vantage points - yet evidently from the same general location:

Since these images were all captured with the same video camera lens (and thus, no focal distorsion phenomena should be expected), it should be possible to accurately overlay these images on top of each other, using the various buildings as a scale reference. As we do so, we should expect the respective buildings' proportions to remain fairly equal, i.e consistent with each other. Well, let us be generous and allow a margin of +5 or -5 percentage points of object-to-object discrepancy - due to the apparent lateral / longitudinal displacements of the cameraman between the shots.
However, as we overlay these shots, we see that the WTC towers' proportions - and only those of the towers - mismatch quite significantly:
Here - the width of the towers mismatch by as much as 20% :

And here, the height of the marked tower section (measured from the rooftop of building A) actually DOUBLES in size :

Now, even making due allowance for the different vantage points - these quite significant discrepancies can only mean one thing:
the towers have been inserted in this purportedly authentic street-view video - by digital compositing .
We may say that we have optical / empirical proof of this assertion.
source video: http://www.youtube.com/watch?v=bSzrDeoEvUw