Reference:
http://wiki.openstreetmap.org/wiki/ Slippy_map_tilenames#Zoom_levels
OSM tiles are 256x256 pixel PNG files.
Filename (URL) format is http://tile.openstreetmap.org/zoom/x/y.png
where
zoom=zoom-level-integer (from 0 to 19),
x=longitude-locator-integer (non-negative column number),
y=latitude-locator-integer (non-negative row number).
In the link above, see sample code to calculate x and y for a given zoom-level and a given latitude and longitude.
The following Atlanta-Northeast area map is
done with map tiles at OSM zoom level 14.
Approximate latitude,longitude of Atlanta area:
33.755, -84.390 degrees
Each OSM tile is a 256x256 PNG file.
Each zoom-level-14 tile is one image of
2^14 x 2^14 = 16,384 x 16,384 = 268,435,456 images ~ 268 million images
which are used by OpenStreetMap to cover most of the Earth.
These zoom-level-14 tiles go from
x-numbers 4350 to 4357. (8 columns)
These zoom-level-14 tiles go from
y-numbers 6553 to 6559. (7 rows)
Total: 8 x 7 = 56 tiles
Image width: 8 x 256 = 2,048 pixels
Image height: 7 x 256 = 1,792 pixels
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Here is a link to the OSM (openstreetmap.org)
'slippy map'
for
Atlanta, Georgia (Wikipedia link) --- initially at zoom-level 14 and
centered at Piedmont Park in northeast Atlanta.
Page was created 2016 Oct 30.
Page was changed 2018 Jun 15.
(Removed row 6552, added 6559.)
Page was changed 2018 Jul 08.
(Added 'slippy map' link.)
Page was changed 2019 Jan 11.
(Added css and javascript to try to handle text-size
for smartphones, esp. in portrait orientation.)
Page was changed 2019 Feb 10.
(HTML changes due to reorg of OSMmaps.)