Many thanks for your response.
1) With all due respect, the terminology choice seems a little unfortunate. To my mind, Native seems like it should indicate images that are entirely pre-processing; **Achieved ** seems like it should indicate post-processing (i.e. post-stitching).
This is pure conjecture on my part, but further, achieved resolution seems like it could vary within a map, based on how it is processed (e.g. terrain or structures processing). Some areas could stitch better, and have better resolution.
In any case, if this is a instance of perfect synonymy, to avoid confusion, it would be good to have this perfectly clear in the original article that I cited.
2) From my original question, I am still wondering if:
"For example, is achieved resolution always (or even typically) higher or lower than native resolution?
3) A question arising from this discussion, since Native = Achieved, do we refer to the resolution of the original photo as original resolution, or is there another more appropriate term?
Thank you for helping me wade through this.