OS Terrain 50 contour layers are supplied as a national vector tiles set in a single MBTiles file. This is a lightweight set of tiles that are efficient and fast to render in your software, provide high-resolution data, and which give a seamless experience when zooming in and out. The data is supplied in Web Mercator projection (ESPG:3857).
The vector tiles schema is detailed in the following table. In the Zoom levels columns within the table, the letter N indicates that the specified layer and attribute are not mapped within that zoom level, whereas the letter Y indicates that the specified layer and attribute are mapped within that zoom level.
| Attribute | Zoom level: 0 to 8 | 9 | 10 | 11 | 12 | 13 | 14 |
|---|---|---|---|---|---|---|---|
| Attribute | Zoom level: 0 to 8 | 9 | 10 | 11 | 12 | 13 | 14 |
|---|---|---|---|---|---|---|---|
| Attribute | Zoom level: 0 to 8 | 9 | 10 | 11 | 12 | 13 | 14 |
|---|---|---|---|---|---|---|---|
id
N
Y
Y
Y
Y
Y
Y
property_value
N
Y
Y
Y
Y
Y
Y
contour_line_type
N
Y
Y
Y
Y
Y
Y
id
N
Y
Y
Y
Y
Y
Y
property_value
N
Y
Y
Y
Y
Y
Y
spot_height_type
N
Y
Y
Y
Y
Y
Y
id
N
Y
Y
Y
Y
Y
Y
property_value
N
Y
Y
Y
Y
Y
Y
water_level_category
N
Y
Y
Y
Y
Y
Y