National Forest Inventory England 2020

Name: National Forest Inventory England 2020
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Published: 2025-02-21 15:24:48
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The National Forest Inventory (NFI) woodland map 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. 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.<div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><div style='font-family:inherit; text-align:justify;'> </div>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.Woodland less than 0.5 hectare in extent, with the expectation of the areas above, will not be described within the dataset but will be included in a separate sample survey of small woodland and tree features.The woodland map is updated on an annual basis and the changes in the woodland boundaries use the Ordnance Survey MasterMap® (OSMM) as a reference where appropriated. The changes in the canopy cover have been identified on:• Sentinel 2 imagery taken during spring/summer 2019 and 2020 or colour aerial orthophotographic imagery available at the time of the assessment;• New planting information for the financial year 2019/2020, from grant schemes and the sub-compartment database covering the estate of Forestry England; Woodland areas, greater than 0.5 hectares, are classified as an interpreted forest type (IFT) from aerial photography and satellite imagery. Non-woodland areas, open areas greater than 0.5 hectare completely surrounded by woodland are described according to open area types. IFT categories are Conifer, Broadleaved, Mixed mainly conifer, Mixed mainly broadleaved, Coppice, Coppice with standards, Shrub, Young trees, Felled, Ground prep, Cloud \ shadow, Uncertain, Low density, Assumed woodland, Failed, Windblow. IOA categories are Open water, Grassland, Agricultural land, Urban, Road, River, Powerline, Quarry, Bare area, Windfarm, Other vegetation. For further information regarding the interpreted forest types (IFT) and the interpreted open areas (IOA) please see NFI description of attributes available on<a href='https://www.forestresearch.gov.uk/' style='color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;' target='_blank' rel='nofollow ugc noopener noreferrer'>www.forestresearch.gov.uk</a></div>

国家森林清查（National Forest Inventory, NFI）林地地图覆盖所有面积≥0.5公顷、林冠郁闭度≥20%或具备达到该郁闭度潜力，且最小宽度不低于20米的森林与林地范围。该范围涵盖新造林地、皆伐迹地、风倒林区及补植区域。本地图排除所有柏油道路、运营中的铁路，以及林地内宽度超过20米的林道、河流与电力线路所占据的区域。所有林地（含城市与乡村林地）无论权属如何，面积均需≥0.5公顷；但推定林地与低密度林区除外，此类区域面积可低至≥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要求，则不受单块面积限制。除上述特殊区域外，面积不足0.5公顷的林地不会纳入本数据集，将归入小型林地与树木特征专项抽样调查范围。本林地地图按年度更新，林地边界变更在适用情况下以英国地形测量局主地图集（Ordnance Survey MasterMap®, OSMM）作为参考依据。林冠郁闭度变更通过以下数据源识别： • 2019年与2020年春夏时段获取的哨兵2号（Sentinel 2）影像，或评估时段可获取的彩色航空正射影像； • 2019/2020财年的新造林信息，数据来自资助计划及覆盖英国林业署（Forestry England）管辖范围的小班数据库；面积≥0.5公顷的林地将通过航空摄影与卫星影像解译，划分为解译森林类型（interpreted forest type, IFT）。完全被林地环绕、面积≥0.5公顷的非林地开阔区域，则按开阔地类型进行标注。解译森林类型（IFT）分类包括：针叶林、阔叶林、以针叶树为主的混交林、以阔叶树为主的混交林、矮林、矮林伴留植树、灌丛、幼林、采伐迹地、整地地块、云与阴影、不确定区域、低密度林、推定林地、造林失败地块、风倒林区。解译开阔地（interpreted open areas, IOA）分类包括：开阔水域、草地、农用地、城镇区域、道路、河流、电力线路、采石场、裸地、风电场、其他植被。如需了解解译森林类型（IFT）与解译开阔地（IOA）的详细信息，请访问www.forestresearch.gov.uk查阅国家森林清查（NFI）属性说明文档。

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