Zoom levels

What is a tile matrix set?

A tile matrix set is a standardised way to divide the coverage of the service into a regularly spaced grid system made up of tiles (512x512 pixels).

By defining the tile matrix set for each coordinate reference system, we can ensure interoperability across different software, achieve accurate positioning with consistent behaviour, and improve performance.

EPSG:3857 tile matrix set

The table below shows the resolution (meters per pixel) and scale of the zoom levels within the EPSG:3857 tile matrix set.

The zoom levels start at 6 to fit in with the industry-standard initial zoom layer. This improves the interoperability of this tile matrix set with third party tools and applications.

Zoom Level	Resolution	Scale	Open or Premium
6	1222.9924525628201	4367830.1877243574709	OpenData
7	611.49622628141	2183915.0938621787354	OpenData
8	305.748113140705	1091957.5469310893677	OpenData
9	152.8740565703525	545978.7734655446839	OpenData
10	76.4370282851763	272989.3867327723419	OpenData
11	38.2185141425881	136494.693366386171	OpenData
12	19.1092570712941	68247.3466831930855	OpenData
13	9.554628535647	34123.6733415965427	OpenData
14	4.7773142678235	17061.8366707982714	OpenData
15	2.3886571339118	8530.9183353991357	OpenData
16	1.1943285669559	4265.4591676995678	Premium data
17	0.5971642834779	2132.7295838497839	Premium data
18	0.298582141739	1066.364791924892	Premium data
19	0.1492910708695	533.182395962446	Premium data

EPSG:27700 tile matrix set

The table below shows the resolution (meters per pixel) and scale of the zoom levels within the EPSG:27700 tile matrix set.

The zoom levels start at 0 rather than at 6 used for the EPSG:3857 tile matrix set, but the range of resolutions and scales is comparable. EPSG:27700 zoom level 0 is similar to EPSG:3857 zoom level 6.

Zoom Level	Resolution	Scale	Open or Premium
0	3584	12799999.998	OpenData
1	1792	6399999.99899	OpenData
2	896	3199999.999496063	OpenData
3	448	1599999.9997480316	OpenData
4	224	799999.9998740158	OpenData
5	112	399999.9999370079	OpenData
6	56	199999.99996850395	OpenData
7	28	99999.99998425198	OpenData
8	14	49999.99999212599	OpenData
9	7	24999.999996062994	OpenData
10	3.5	12499.999998031497	OpenData
11	1.75	6249.9999990157485	OpenData
12	0.875	3124.9999995078742	Premium data
13	0.4375	1562.4999997539371	Premium data
14	0.21875	781.2499998769686	Premium data
15	0.109375	390.6249999384843	Premium data