"~ Scale" is only an approximate size comparison and refers to distances on the Equator.These values for "m / pixel" are calculated with an Earth radius of 6372.7982 km and hold at the Equator for other latitudes the values must be multiplied by the cosine (approximately assuming a perfect spheric shape of the geoid) of the latitude.
Values listed in the column "m / pixels" gives the number of meters per pixel at that zoom level for 256-pixel wide tiles.The "° Tile width" column gives the map width in degrees of longitude, for a square tile drawn at that zoom level.This is useful when calculating storage requirements for pre-generated tiles. The "# Tiles" column indicates the number of tiles needed to show the entire world at the given zoom level.Variation with latitude of represented distances (in degrees or pixels) on the Mercator projection per actual distances (in meters) on Earth surface.
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