Do they make a standalone camera that just takes pictures and stores them?
Do these output something that can be directly uploaded to google maps (photosphere format)?
No photo resolution was included, it doesn't say how many megapixels. 3K photo, usually the _K format tells us how many horizontal pixels there are. This sounds like a low resolution photo for a 360 degree.
Let's say you are taking a medium quality 2 megapixel, 4:3 Aspect Ratio, 1632 (Horizontal) x 1224 (Vertical) and it covers 90 degrees of your 360 degree photo.
1632 x 4 = 6,528 x 1,224 photo or 6K. Is this camera output 3,264 x 612?