540p - Less noise if average instead of drop lines?

[MikePeralta]

Hey all,

As far as I understand, raw video at 540 is more of a zoom/crop of the middle of the sensor, instead of averaging the full area together. Wouldn't this use less of the actual sensor, thus creating more noise? I was wondering if there would instead be a way to pull the full 1080p from the sensor, then resize from there instead.

Sorry if this post is totally ignorant. Just guessing.