How Accurate Are Resolution Specs For Panoramic Cameras?

I just installed a DS-2CD6362F-I this past week and noticed the "6MP" claim to be a bit misleading... the full image is 2048x2048 (4MP) and there are three "digital PTZ windows" that can be up to (but not larger than) XGA (1024x768, or about 0.75MP)... it seems 6MP refers to the combination of all three.

Is this common of other panoramic cameras?

I was just reminded of the "Panoramic camera shootout" article, and looked through that, as well as a linked test of this camera and its 3MP little brother, but I didn't see any mention of this... discrepancy.

[IPVM Note: Covered: Beware Imager vs Stream Resolution]

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