Map of a Greek Island
Santorini Island
(aka Thera or Thira or Fira)

Done with OSM Tiles

Zoom Level 12

(OSM = Open Street Map)

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This OSM Map of Santorini island page

Reference:
http://wiki.openstreetmap.org/wiki/ Slippy_map_tilenames#Zoom_levels

Brief overview:

• 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 map of the Greek island Santorini is done
with map tiles at OSM zoom level 12.

Approximate latitude,longitude of Santorini:
36.42 , 25.43 degrees

Each OSM tile is a 256x256 PNG file.

Each zoom-level-12 tile is one image of
2^12 x 2^12 = 4096 x 4096 = 16,777,216 images ~ 16 million images
which are used by OpenStreetMap to cover most of the Earth.

These zoom-level-12 tiles go from
x-numbers 2335 to 2342. (8 columns)

These zoom-level-12 tiles go from
y-numbers 1601 to 1603. (3 rows)

Total: 8 x 3 = 24 tiles

Image width: 8 x 256 = 2,048 pixels
Image height: 3 x 256 = 768 pixels

These tiles are fetched from the
OSM server when you (re)load this page.

So these tiles form an image using
the latest versions of the OSM tiles.

Here is a link to the OSM (openstreetmap.org) 'slippy map'
for Santorini (Wikipedia link) --- initially at zoom-level 11 and
centered at latitude and longitude 36.42 25.43,
near the center of the island.

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Page created 2019 Feb 10.