# raillandcovertierbvalue This code list is used in association with the OS Land Cover Tier B attribute which is present within the Rail Feature Type. The code list gives a high-level description of the land cover for this specific topographic feature, where known. Up to five distinct land cover types can be applied. | Label | Definition | | ------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Bare Earth Or Grass | Land that can be interpreted as having a natural surface cover which is not classified vegetation and is not associated with other themes. | | Coniferous Trees | An area of cone-bearing trees (for example, yews, pines, firs, and larch), where the trees are generally spaced not more than 30m apart. | | Heath | An area of vegetation made up of a combination of heather or bilberry with very few trees or bushes. | | Made Sealed | A manmade surface that consists of a solid material that is bonded (i.e. is not loose). | | Made Unknown | A manmade surface that may be either sealed or unsealed. | | Made Unsealed | A surface that has been enhanced by the addition of a loose material, other than that which occurs naturally at that location. | | Mixed Trees | An area of cone-bearing trees (for example, yews, pines, firs, and larch) and trees that do not bear cones (for example, Ash, Aspen, Birch, Horse Chestnut, Maple, Oak, Poplar, and Sycamore), where the trees are generally spaced not more than 30m apart. | | Non-Coniferous Trees | An area of trees that do not bear cones (including Ash, Aspen, Birch, Horse Chestnut, Maple, Oak, Poplar, and Sycamore), where the trees are generally spaced not more than 30m apart. | | Rock | An aggregate of minerals that is part of the land mass and which covers 25 to 100% of an area. | | Rough Grassland | Areas of bracken and uncultivated grassland, often tufted with a 'hummocky' appearance, and normally found on the higher parts of hills, mountains, and downland. | | Sand | Minute particles resulting from the wearing down of rocks. | | Scattered Coniferous Trees | An area of cone-bearing trees (for example, yews, pines, firs, and larch), where the trees are generally spaced more than 30m apart. | | Scattered Mixed Trees | An area of cone-bearing trees (for example, yews, pines, firs, larch) and trees that do not bear cones (for example, Ash, Aspen, Birch, Horse Chestnut, Maple, Oak, Poplar, and Sycamore), where the trees are generally spaced more than 30m apart. | | Scattered Non-Coniferous Trees | An area of trees that do not bear cones (these trees include Ash, Aspen, Birch, Horse Chestnut, Maple, Oak, Poplar, and Sycamore), where the trees are generally spaced more than 30m apart. | | Scrub | All shrubs and bushes, including rhododendrons, brambles, gorse, and broom. | --- # 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/osngd/code-lists/code-lists-overview/raillandcovertierbvalue.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.