flâneur

Zoom levels - OpenStreetMap Wiki

wiki.openstreetmap.org · 1,092 words · saved by 1 readers

A zoom level is an integer that represents how much of the world is visible on a map. Many mapping systems use zoom levels as a convenient way to represent discrete steps in map scale and usually expose between 20 and 24 steps. How these steps correspond to scale is not standardized and depends on the exact system and the tile format. Typical zoom levels for square 256px raster tiles correspond to: The horizontal distance represented by each square tile, measured along the parallel at a given latitude, is given by: where C means the equatorial circumference of the Earth (40 075 016.686 m ≈ 2π ∙ 6 378 137.000 m for the reference geoid used by OpenStreetMap). As tiles are 256-pixels wide, the horizontal distance represented by one pixel is: Make sure your calculator is in degrees mode, unless you want to express latitude in radians for some reason. C should be expressed in whatever scale unit you're interested in (miles, meters, feet, smoots, whatever). This formula assumes that the Eart

A zoom level is an integer that represents how much of the world is visible on a map. Many mapping systems use zoom levels as a convenient way to represent discrete steps in map scale and usually expose between 20 and 24 steps. How these steps correspond to scale is not standardized and depends on the exact system and the tile format. Typical zoom levels for square 256px raster tiles correspond to: Level # Tiles Tile width (° of longitudes) m / pixel (on Equator) ~ Scale (on screen) Examples of areas to represent 0 1 360 156 543 1:500 million whole world 1 4 180 78 272 1:250…

saved by

related reading