Zoom levels

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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
0 360.0000 whole world 156,412 1:500 Mio
1 180.0000 078,206.000 1:250 Mio
2 090.0000 039,103.000 1:150 Mio
3 045.0000 019,551.000 1:70 Mio
4 022.5000 009,776.000 1:35 Mio
5 011.2500 004,888.000 1:15 Mio
6 005.6250 002,444.000 1:10 Mio
7 002.8130 001,222.000 1:4 Mio
8 001.4060 000,610.984 1:2 Mio
9 000.7030 wide area 000,305.492 1:1 Mio
10 000.3520 000,152.746 1:500,000
11 000.1760 area 000,076.373 1:250,000
12 000.0880 000,038.187 1:150,000
13 000.0440 village or town 000,019.093 1:70,000
14 000.0220 largest editable area on the applet 000,009.547 1:35,000
15 000.0110 000,004.773 1:15,000
16 000.0050 small road 000,002.387 1:8,000
17 000.0030 000,001.193 1:4,000
18 000.0010 000,000.596 1:2,000
19 000.0005 000,000.298 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 (85.2 pixels per inch or PPI)

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