I disagree with your limitation on the meaning of the word 'flat.' As a source for substantiation of my disagreement with you, please see definition # 6 at:
http://dictionary.reference.com/browse/flat
The word flat specifically connote landscape issues where items previously standing thereon have been felled.
Fair enough. You, however, should have made it clear much earlier on that you were using the word "flat" in an unusual sense, one not touched upon until definition 6 at the above reference. When using an ordinary word in an unusual sense, it is customary to say so, and it is also customary not to then use arguments that imply that you are using the word in one of its commonly understood senses (see definitions 1-3, above link).
For instance, if you're using "flat" to mean "thrown down, laid low, or level with the ground, as fallen trees or buildings" and someone claims Ground Zero was not flat, then a response like, "Oh, by 'flat' I meant the buildings have fallen down, which you can clearly see from these photographs because the buildings are not standing" would have clarified the point and led to effective communication and ultimately agreement. Instead, you made false claims about no debris being piled more than a story high, photographs being deceptive, and so forth -- all unnecessary obfuscations and digressions, if all you really meant to say was that the buildings had been "thrown down, laid low, fallen" which we could all have immediately agreed with and moved on.
Please cease and desist from trying to derail this discussion in the manner of questioning word usage.
When the entire topic of the thread is your claim that the Ground Zero debris is flat, clarifying exactly what you mean by "flat" is in no way a derail. It is in fact the only way to hope to continue to discuss the topic in any (literally) meaningful way. Nonetheless, if you disagree, you may report my posts, as attempting to derail threads is not permitted by the Membership Agreement.
The reason this is important is that we already knew that what was left at Ground Zero was much less tall than the intact towers had been. We already know that the towers were "thrown down," "laid low," and "fallen." (They were not in this case, as fallen trees might be, "level with the ground," as the LIDAR measurements show.) That is why we say that the towers "collapsed" rather than, for example, that they "shrank a little," "turned purple," or "grew taller." To collapse is to become "thrown down," "laid low," and "fallen" -- that is, (by definition 6) flat.
The problem with this for your theory is, the fact that Ground Zero was (by definition 6) flat is entirely consistent with collapse caused by airplane impacts and fire, or in fact any collapse scenario whatsoever, or any means whatsoever that they might have become "laid low," "thrown down," and "fallen." So, it turns out that this entire thread was an unnecessary waste of your time, as the (by definition 6) flatness of Ground Zero provides no evidence for your claims. That waste could have been avoided had you disclosed and explained which of the 55 or so alternative meanings of "flat" you were using much sooner.
Respectfully,
Myriad