Layers and styles

OS Maps API is available as EPSG:27700 (British National Grid which is applicable just for GB) and EPSG:3857 (Web Mercator which is a global coordinate system).

The API includes four OS styles: Road, Outdoor, Light (in both 27700 and 3857), and Leisure (in 27700).

Style	Projection	Layer Name	Tile Matrix Set
Road	EPSG:27700	Road_27700	EPSG:27700
Road	EPSG:3857	Road_3857	EPSG:3857
Outdoor	EPSG:27700	Outdoor_27700	EPSG:27700
Outdoor	EPSG:3857	Outdoor_3857	EPSG:3857
Light	EPSG:27700	Light_27700	EPSG:27700
Light	EPSG:3857	Light_3857	EPSG:3857
Leisure	EPSG:27700	Leisure_27700	EPSG:27700

Light

Outdoor

Road

Leisure

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 scale is calculated at a DPI of 96. The table also shows which zoom levels are OS OpenData, and which are Premium data.

The zoom levels start at 7 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	Road, Outdoor and Light styles
7	1,223	1:4,622,324	Open data
8	611	1:2,311,162	Open data
9	306	1:1,155,581	Open data
10	153	1:577,791	Open data
11	76	1:288,895	Open data
12	38	1:144,448	Open data
13	19	1:72,224	Open data
14	9.6	1:36,112	Open data
15	4.8	1:18,056	Open data
16	2.4	1:9,028	Open data
17	1.2	1:4,514	Premium data
18	0.60	1:2,257	Premium data
19	0.30	1:1,128	Premium data
20	0.15	1:564	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 scale is calculated at a DPI of 96. The table also shows which zoom levels are OS OpenData, and which are Premium data.

The zoom levels start at 0 rather than at 7 used for the EPSG:3857 tile matrix set, but the range of resolutions & scales is comparable. EPSG:27700 zoom level 0 is similar to EPSG:3857 zoom level 7.

Zoom level	Resolution	Scale	Road, Outdoor and Light styles	Leisure style
0	896.0	1:3,386,450	Open data	Open data
1	448.0	1:1,693,225	Open data	Open data
2	224.0	1:846,612	Open data	Open data
3	112.0	1:423,306	Open data	Open data
4	56.0	1:211,653	Open data	Open data
5	28.0	1:105,827	Open data	Open data
6	14.0	1:52,913	Open data	Premium data
7	7.0	1:26,457	Open data	Premium data
8	3.5	1:13,228	Open data	Premium data
9	1.75	1:6,614	Open data	Premium data
10	0.875	1:3,307	Premium data	n/a
11	0.4375	1:1,654	Premium data	n/a
12	0.21875	1:827	Premium data	n/a
13	0.109375	1:413	Premium data	n/a