Zoom levels
| 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 |
| 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 |
The 'degree' column gives the map width in degrees, for map at that zoom level which is 256 pixels wide. The 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 maths
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)
