# 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).

<table><thead><tr><th width="198">Style</th><th>Projection</th><th>Layer Name</th><th>Tile Matrix Set</th></tr></thead><tbody><tr><td>Road</td><td>EPSG:27700</td><td><code>Road_27700</code></td><td>EPSG:27700</td></tr><tr><td>Road</td><td>EPSG:3857</td><td><code>Road_3857</code></td><td>EPSG:3857</td></tr><tr><td>Outdoor</td><td>EPSG:27700</td><td><code>Outdoor_27700</code></td><td>EPSG:27700</td></tr><tr><td>Outdoor</td><td>EPSG:3857</td><td><code>Outdoor_3857</code></td><td>EPSG:3857</td></tr><tr><td>Light</td><td>EPSG:27700</td><td><code>Light_27700</code></td><td>EPSG:27700</td></tr><tr><td>Light</td><td>EPSG:3857</td><td><code>Light_3857</code></td><td>EPSG:3857</td></tr><tr><td>Leisure</td><td>EPSG:27700</td><td><code>Leisure_27700</code></td><td>EPSG:27700</td></tr></tbody></table>

<table data-card-size="large" data-view="cards"><thead><tr><th></th><th data-hidden></th><th data-hidden></th><th data-hidden data-card-cover data-type="image">Cover image</th></tr></thead><tbody><tr><td><strong>Light</strong></td><td></td><td></td><td data-object-fit="cover" data-alt="Example image showing the Light style for the OS Maps API."><a href="https://4043944746-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FoEzqrBzRGoJw7nQyLj1W%2Fuploads%2Fgit-blob-f4ebe6d7eeed5492a9f941aa700f96ef2998588f%2Fz11%20light%20after.PNG?alt=media">z11 light after.PNG</a></td></tr><tr><td><strong>Outdoor</strong></td><td></td><td></td><td data-object-fit="cover" data-alt="Example image showing the Outdoor style for the OS Maps API."><a href="https://4043944746-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FoEzqrBzRGoJw7nQyLj1W%2Fuploads%2Fgit-blob-0e96155052b4516fc2998bbc265e2cab4521706a%2Fz2%20after.png?alt=media">z2 after.png</a></td></tr><tr><td><strong>Road</strong></td><td></td><td></td><td data-object-fit="cover" data-alt="Example image showing the Road style for the OS Maps API."><a href="https://4043944746-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FoEzqrBzRGoJw7nQyLj1W%2Fuploads%2Fgit-blob-48d071fac042b2b3a93bf2096a8aa9c4f39565c5%2FZ4_after.png?alt=media">Z4_after.png</a></td></tr><tr><td><strong>Leisure</strong></td><td></td><td></td><td data-object-fit="cover" data-alt="Example image showing the Leisure style for the OS Maps API."><a href="https://4043944746-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FoEzqrBzRGoJw7nQyLj1W%2Fuploads%2Fgit-blob-8e35c00283bab54132d2c6dcc3fa65d6090dcc44%2Fos-maps-leisure.png?alt=media">os-maps-leisure.png</a></td></tr></tbody></table>

## 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.

<table><thead><tr><th width="138">Zoom Level</th><th width="150">Resolution</th><th width="193">Scale</th><th>Road, Outdoor and Light Styles</th></tr></thead><tbody><tr><td>7</td><td>1,223</td><td>1:4 622 324</td><td>Open data</td></tr><tr><td>8</td><td>611</td><td>1:2 311 162</td><td>Open data</td></tr><tr><td>9</td><td>306</td><td>1:1 155 581</td><td>Open data</td></tr><tr><td>10</td><td>153</td><td>1:577 791</td><td>Open data</td></tr><tr><td>11</td><td>76</td><td>1:288 895</td><td>Open data</td></tr><tr><td>12</td><td>38</td><td>1:144 448</td><td>Open data</td></tr><tr><td>13</td><td>19</td><td>1:72 224</td><td>Open data</td></tr><tr><td>14</td><td>9.6</td><td>1:36 112</td><td>Open data</td></tr><tr><td>15</td><td>4.8</td><td>1:18 056</td><td>Open data</td></tr><tr><td>16</td><td>2.4</td><td>1:9 028</td><td>Open data</td></tr><tr><td>17</td><td>1.2</td><td>1:4 514</td><td>Premium data</td></tr><tr><td>18</td><td>0.60</td><td>1:2 257</td><td>Premium data</td></tr><tr><td>19</td><td>0.30</td><td>1:1 128</td><td>Premium data</td></tr><tr><td>20</td><td>0.15</td><td>1:564</td><td>Premium data</td></tr></tbody></table>

## 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 and scales is comparable. EPSG:27700 zoom level 0 is similar to EPSG:3857 zoom level 7.

<table><thead><tr><th width="130">Zoom Level</th><th width="114">Resolution</th><th width="128">Scale</th><th width="214">Road, Outdoor and Light Styles</th><th>Leisure Style</th></tr></thead><tbody><tr><td>0</td><td>896.0</td><td>1:3 386 450</td><td>Open data</td><td>Open data</td></tr><tr><td>1</td><td>448.0</td><td>1:1 693 225</td><td>Open data</td><td>Open data</td></tr><tr><td>2</td><td>224.0</td><td>1:846 612</td><td>Open data</td><td>Open data</td></tr><tr><td>3</td><td>112.0</td><td>1:423 306</td><td>Open data</td><td>Open data</td></tr><tr><td>4</td><td>56.0</td><td>1:211 653</td><td>Open data</td><td>Open data</td></tr><tr><td>5</td><td>28.0</td><td>1:105 827</td><td>Open data</td><td>Open data</td></tr><tr><td>6</td><td>14.0</td><td>1:52 913</td><td>Open data</td><td>Premium data</td></tr><tr><td>7</td><td>7.0</td><td>1:26 457</td><td>Open data</td><td>Premium data</td></tr><tr><td>8</td><td>3.5</td><td>1:13 228</td><td>Open data</td><td>Premium data</td></tr><tr><td>9</td><td>1.75</td><td>1:6 614</td><td>Open data</td><td>Premium data</td></tr><tr><td>10</td><td>0.875</td><td>1:3 307</td><td>Premium data</td><td>N/A</td></tr><tr><td>11</td><td>0.4375</td><td>1:1 654</td><td>Premium data</td><td>N/A</td></tr><tr><td>12</td><td>0.21875</td><td>1:827</td><td>Premium data</td><td>N/A</td></tr><tr><td>13</td><td>0.109375</td><td>1:413</td><td>Premium data</td><td>N/A</td></tr></tbody></table>