National Forest Inventory Scotland 2022

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.

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 2022 or colour aerial orthophotographic imagery available at the time of the assessment;
New planting information for the financial year 2021/2022, from grant schemes and the sub-compartment database covering the estate of Forestry England, Forestry and Land Scotland and Natural Resources Wales;
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 www.forestresearch.gov.uk Attribution statement: © Forestry Commission copyright and/or database right 2023. All rights reserved.

国家森林清查（NFI）林地地图覆盖了所有面积超过0.5公顷且树冠覆盖率不低于20%（或具有达到此覆盖率的潜力）以及最小宽度为20米的森林和林地区域。这包括新种植、皆伐、风害和更新造林区域。林地地图排除了所有沥青路面和正在运营的铁路，以及森林道路、河流和电力线路，在这些地方林地中的间隙宽度超过20米。所有林地（无论城市还是农村），无论所有权如何，只要面积达到0.5公顷或更大，便包含在内，除非是假定的林地或低密度区域，其面积可以小至0.1公顷或更大。此外，对于跨越国家边界的林地区域，如果总面积符合最小尺寸要求，则不适用最小尺寸限制。面积小于0.5公顷的林地，根据上述情况，将不会在数据集中进行描述，但将包括在针对小型林地和树木特征的单独样本调查中。林地地图每年更新一次，在适当的情况下，使用大地测量局主地图®（OSMM）作为参考来确定林地边界的变化。树冠覆盖率的变化已在以下方面进行识别：2022年春季/夏季拍摄的哨兵2号图像或评估时的彩色航空正射影像；2021/2022财政年度的新种植信息，来自拨款方案和涵盖英国林业局、苏格兰林业和土地局以及威尔士自然资源局地产的子区数据库；面积大于0.5公顷的林地被归类为从航空摄影和卫星图像中解读出的森林类型（IFT）。非林地区域，完全被林地环绕且面积大于0.5公顷的开阔地区，根据开阔区域类型进行描述。IFT类别包括针叶林、阔叶林、主要针叶林混合、主要阔叶林混合、疏林地、疏林地带标准林、灌木林、幼树林、采伐林、土地准备、云影、不确定、低密度、假设定林地、失败、风害。IOA类别包括开放水域、草地、农业用地、城市、道路、河流、输电线、采石场、裸地、风力发电场、其他植被。有关解读森林类型（IFT）和解读开阔区域（IOA）的更多信息，请参阅www.forestresearch.gov.uk上的NFI属性描述。版权声明：© 林业委员会版权和/或数据库权利2023。版权所有。