[ContextCapture] - General guidelines on usage

Hi,

We have been starting to test CC to see if it can be useful for us in our business. On this a couple of questions have came up:

1. Photogroups

Are there any advantages/disadvantages to have several photogroups, even if all pics have same properties? Let's say I have 1000 pics - will there be any difference (processing speed, quality) if I would split these pics into several photogroups?

2. Tiling

Sort of same question as above, but on tiling: Any difference on quality and/or processing time depending on selection of (level of) tiling? Should we try to have as few tiles as possible, or could it possibly be the opposite => that MANY tiles are preferable?

3. Tiling algorithm

We'be been a bit puzzled on what it is that actually "triggers" that tiling is necessary. Let me explain: Some models we've done have been from quite large amount of (hires) pics, resulting in NO need for tiling. Other models have been fewer pics, but still resulted in need of tiling. How come..?

4. Tie points

It is interesting to note/see the resulting number of calculated tie points after aerotriangulation. It can differ severly from (in principle) same set of pics (for example: Before/after balancing pic histograms). It can differ a factor two. But strangely enough, more tie points doesn't necessarily make a better model... So the question: How should one "interpret" the resulting no:s of tie points? Can any "conclusions" be made from the calculated number?

5. User tie points

It is possible to create user tie points. But why...? I mean, in what situation is that useful/necessary? In principle: Is there any reason why I should put the time to add some manual tie point to the [many thousands] that are created in the aerotriangulation? Could A FEW manual tie points make any major difference to the quality of the created model?

Thanks a lot in advance for answers/comments!  :-)