Sorry, you need to enable JavaScript to visit this website.

Zoom Levels and Tile Grid

 

Service version: 1
Last edit: 2020.08.05

On this page

Purpose

TomTom Maps use the Spherical Mercator projection coordinate system (EPSG:3857).

Zoom levels

The world is divided into square tiles.

  • Maps Raster has 23 zoom levels, numbered 0 through 22.
  • Maps Vector has 23 zoom levels, numbered 0 through 22.

At zoom level 0, the entire world fits on a single tile:

world on a single tile

Zoom level 1 uses 4 tiles to render the world: a 2 x 2 square.

upper-left tile upper-right title
lower-left tile lower-right tile

Each subsequent zoom level quad divides the tiles of the previous one, creating a grid of 2zoom x 2zoom.

For example, zoom level 22 is a grid 222 x 222, or 4,194,304 x 4,194,304 tiles (result: 17,592,186,044,416 in total).

To discover the real-world size of a single tile on a given zoom level, we can use the formula circumference of earth / 2zoom level that produces number of meters per tile side, where the circumference of the earth equals 40,075,017 meters.

The full data table of values for zoom levels is here:

zoom level meters/pixel meters/tile side
0 156543 40075017
1 78271.5 20037508
2 39135.8 10018754
3 19567.88 5009377.1
4 9783.94 2504688.5
5 4891.97 1252344.3
6 2445.98 626172.1
7 1222.99 313086.1
8 611.5 156543
9 305.75 78271.5
10 152.87 39135.8
11 76.44 19567.9
12 38.219 9783.94
13 19.109 4891.97
14 9.555 2445.98
15 4.777 1222.99
16 2.3887 611.496
17 1.1943 305.748
18 0.5972 152.874
19 0.14929 76.437
20 0.14929 38.2185
21 0.074646 19.10926
22 0.037323 9.55463

▲ Return to top

Tile grid

Tiles are called by zoom level and the x and y coordinates corresponding to the tile's position on the grid for that zoom level.

When determining which zoom level to use, remember that each location is in a fixed position on its tile.

  • This means that the number of tiles needed to display a given expanse of territory is dependent on the specific placement of zoom grid on the world.
  • For instance, if there are two points 900 meters apart, it may only take three tiles to display a route between them at zoom level 17.

However, if the western point is on the right side of its tile, and the eastern point on its left side, it may take four tiles as shown in the following diagram:
4 tiles and 3 tiles routes

Once the zoom level is determined, the x and y coordinate values can be calculated:

  • The top-left tile in each zoom grid is x=0, y=0.
  • The bottom-right tile is at x=2zoom-1, y=2zoom-1.

Here is the zoom grid for zoom level 1:
zoom grid for zoom level 1

▲ Return to top