# List of Layers The table below provides the list of layers and a brief description for each one. | Layer | Description | | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Airports | A centre point for all major airports including a name. | | Boundaries | National boundary lines between England - Scotland and England - Wales. | | Building | Generalised building footprints at both local and district resolutions. The local buildings have a unique identifier which can be used to style features distinctly. The identifier will not be persistent between product versions and therefore there will be no change history information for a feature. | | Contours | These contours lines have a 10-metre interval with an index every 50 metres. Each contour contains a value. | | ETL | Electricity Transmission Lines. | | Foreshore | These polygons depict the part of the shore or beach which lies between the Mean Low Water Mark and Mean High Water Mark. | | Greenspace | Polygon features representing the extent of places such as parks and sports facilities that are likely to be accessible to the public. | | Land | This layer depicts the shape of Great Britain. (GeoPackage only) | | Names | Use this point layer to render contextual labels on your map. | | National Parks | Theses polygons depict the extent of the 15 National Parks in Great Britain. | | Railway Stations | This layer contains a point for all stations and includes a name. | | Rail | Lines representing the railway network. They are broken where they pass under bridges, buildings or other obstructing detail. | | Roads | Lines representing the road network. A road is defined as a metalled way for vehicles. | | Sea | This layer depicts the sea around Great Britain. (Vector Tiles only) | | Sites | Polygon features that represent the area or extent of certain types of function or activity. | | Surface Water | These polygons represent inland water bodies that are sufficiently wide enough to be captured as an area. | | Urban Areas | These are generalised polygons representing built-up areas for use at smaller scales. | | Waterlines | Lines representing rivers, canals, drains and other linear bodies of water. | | Woodland | The polygons represent areas of trees: coniferous, non-coniferous and mixed. | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/os-open-zoomstack/os-open-zoomstack-technical-specification/list-of-layers.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.