National Forest Inventory Woodland

An extract of the National Forest Inventory (NFI). This covers all forest and woodland area over 0.5 hectare with a minimum of 20% canopy cover, or the potential to achieve it, and a minimum width of 20 metres in the West of England (including North Somerset).This includes areas of new planting, clearfell, windblow and restock. The woodland map excludes all 'tarmac' roads and active railways, and forest roads, rivers and powerlines where the gap in the woodland is greater than 20 meters wide.All woodland (both urban and rural), regardless of ownership, is 0.5 hectare or greater in extent, with the exception of Assumed woodland or Low density areas that can be 0.1 hectare or greater in extent. Also, in the case of woodland areas that cross the countries borders, the minimum size restriction does not apply if the overall area complies with the minimum size. Full metadata is available from the Forestry Commission.

本数据集为国家森林资源清查（National Forest Inventory, NFI）的节选数据。其覆盖英格兰西部（含北萨默塞特郡）所有满足以下条件的森林与林地：面积不低于0.5公顷、郁闭度不低于20%或具备达到该郁闭度的潜力，且最小宽度不低于20米。该数据集涵盖新植林地、皆伐迹地、风倒林区以及更新造林区域。本林地数据图层排除所有沥青铺装道路、运营铁路，以及林地间隙宽度超过20米的林区道路、河流与输电线路区域。所有林地（包含城市与乡村林地）无论权属如何，面积均不得低于0.5公顷；但假定林地与低密度林地除外，此类区域的面积要求可放宽至不低于0.1公顷。此外，若跨国家边界的林地整体面积符合最小面积标准，则不受单块区域的最小尺寸限制。完整元数据可从英国林业委员会获取。