Just as with digital photography, the polarization will be stronger at certain angles from the sun and weaker in others. For aerial photos, the same planning and execution done with a DSLR can take place. For video, the variance hasn't been very noticeable when flying in multiple directions, in my opinion. Most of my shooting, however, is in one planned direction. A polarizer will, however, affect panoramas and 360 degree (tiny planet) photos. What happens is in certain directions, half a photo may apply stronger polarization creating a vignette type of effect on that part of the image (e.g. darker, more vibrant sky). When all the photos are stitched together, there will be some noticeable 'blotches' where this occurred. My recommendation if you plan to take these types of photos is to use a weaker polarization, a compromise, if you will, to balance out the photo. If you shoot everything in RAW and manually stitch the photos in post, the dark areas can be adjusted fairly easily to even things out. It's best to get it right out of camera though so spinning the polarizer to a weaker setting is worthwhile.
