In spite of being a widely discussed topic, I have not been able to find the complete answer to my concerns regarding scale's use in maps preparation. I am interested in finding in the relationship(s) between pixel size and the best scale which can be derived from a particular product (image). Let's suppose I want to prepare a Land cover map (using unsupervised classification for example), using for that purpose only Landsat imagery (fixed 30x30m pixels), which criteria should be considered to define the 'best' achievable scale for the land cover map in this case?
[update] Figuring out map scale when you know the spatial resolution of a Satellite Image?
Appropriate pixel size when converting vector to raster
Calculate scale of a raster