Host map of Ash trees in Great Britain

This is an Ash (Fraxinus excelsior) host map for Great Britain at the 1 km x 1 km scale. The units are in terms of ha or ash per 1km x 1km grid square. There are 100 ha in 1km x 1 km, so this can be thought of as a percent. It was created generating a 20m x 20m land use layer based on the UKCEH Land Cover Map for 2019, deriving areas of broadleaved tree cover for each cell of the land use layer and estimating the percentage of ash within broadleaf, which were assigned dependent on land use and region (see more details about the methods in data preparation and processing activities). The percentage of ash and area of broadleaf trees were combined to give an area of ash for each land use in cell and this was aggregated (summed) across all land use types to give a 1km by 1km ash area map.