It seems to me that trying to describe what is a landscape shot has little to do with the equipment used, the angle of view, and the framing (aspect ratio) of the image, but rather the content captured in the photo on the human scale of things. Some of the phrases used in previous posts are indicative of this, e.g. 'an extensive view' and 'a comparatively large expanse of land'. The majority of photos described as landscapes often appear to contain a scene of land (or of coast) that is perhaps hundreds or more times the size of a human being.
Cheers.
Philip