Zoom levels

From OpenStreetMap Wiki
Jump to: navigation, search
Available languages
Deutsch English español français Nederlands polski
Distances per degree for the latitudes marked in the picture
degree distance
@ 0° Lat @ 30° Lat @ 60° Lat
0.01° ~ 1 km ~ 1.2 km ~ 2 km
0.001° ~ 100 m ~ 120 m ~ 200 m
0.0001° ~ 10 m ~ 12 m ~ 20 m
0.00001° ~ 1 m ~ 1.2 m ~ 2 m
Variation in metres per pixel with latitude on the mercator projection.
Level Degree Area m / pixel ~Scale
0 360 whole world 156,412 1:500 Mio
1 180 78,206 1:250 Mio
2 90 39,103 1:150 Mio
3 45 19,551 1:70 Mio
4 22.5 9,776 1:35 Mio
5 11.25 4,888 1:15 Mio
6 5.625 2,444 1:10 Mio
7 2.813 1,222 1:4 Mio
8 1.406 610.984 1:2 Mio
9 0.703 wide area 305.492 1:1 Mio
10 0.352 152.746 1:500,000
11 0.176 area 76.373 1:250,000
12 0.088 38.187 1:150,000
13 0.044 village or town 19.093 1:70,000
14 0.022 largest editable area on the applet 9.547 1:35,000
15 0.011 4.773 1:15,000
16 0.005 small road 2.387 1:8,000
17 0.003 1.193 1:4,000
18 0.001 0.596 1:2,000
19 0.0005 0.298 1:1,000


The 'degree' column gives the map width in degrees, for map at that zoom level which is 256 pixels wide. Values listed in the column "m / pixels" gives the number of meters per pixel at that zoom level. These values ​​for "m / pixel" are calculated with an earth radius of 6372.7982 km. "Scale" (map scale) is only an approximate size comparison and refers to distances on the equator. In addition, the map scale will be dependent on the monitor. These values are for a monitor with a 0.3 mm / pixel (about 85.2 American DPI)

Metres per pixel math

The distance represented by one pixel (S) is given by

S=C*cos(y)/2^(z+8)

where...

C is the (equatorial) circumference of the Earth
z is the zoom level
y is the latitude of where you're interested in the scale.

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). Since the earth is actually ellipsoidal, there will be a slight error in this calculation. But it's very slight. (0.3% maximum error)

See also