National Forest and Sparse Woody Vegetation Data (Version 7.0 - 2022 Release)

Landsat satellite imagery is used to derive woody vegetation extent products that discriminate between forest, sparse woody and non-woody land cover across a time series from 1988 to 2022. A forest is defined as woody vegetation with a minimum 20 per cent canopy cover, at least 2 metres high and a minimum area of 0.2 hectares. Note that this product is not filtered to the 0.2ha criteria for forest to allow for flexibility in different use cases. Filtering to remove areas less than 0.2ha is undertaken in downstream processing for the purposes of Australia's National Inventory Reports. Sparse woody is defined as woody vegetation with a canopy cover between 5-19 per cent.\r\n\r\nThe three-class classification (forest, sparse woody and non-woody) supersedes the two-class classification (forest and non-forest) from 2016. The new classification is produced using the same approach in terms of time series processing (conditional probability networks) as the two-class method, to detect woody vegetation cover. The three-class algorithm better encompasses the different types of woody vegetation across the Australian landscape.\r\n\r\nUnlike previous versions of the National Forest and Sparse Woody Vegetation data releases where 35 tiles have been released concurrently as part of the product, only the 25 southern tiles were supplied in the initial v7.0 release in June 2023. The 10 northern tiles have been released in July 2024 as v7.1 as a supplement to the initial product release to complete the standard 35 tiles. Please see the National Forest and Sparse Woody Vegetation data metadata pdf (Version 7.1 - 2022 release) for more information.

Landsat卫星影像被用于生成木本植被范围产品，该产品可在1988年至2022年的时间序列中区分森林、稀疏木本和非木本土地覆盖类型。森林被定义为冠层覆盖度至少20%、高度不低于2米且面积最小为0.2公顷的木本植被。请注意，该产品未按森林的0.2公顷标准进行过滤，以便在不同用例中保持灵活性。为编制澳大利亚国家清单报告，在下游处理中会进行过滤以移除面积小于0.2公顷的区域。稀疏木本被定义为冠层覆盖度介于5%至19%之间的木本植被。

三类分类（森林、稀疏木本和非木本）取代了2016年推出的二类分类（森林和非森林）。新分类在时间序列处理（条件概率网络，conditional probability networks）方面采用了与二类方法相同的思路，以检测木本植被覆盖情况。三类算法能更好地涵盖澳大利亚地貌中不同类型的木本植被。与此前国家森林和稀疏木本植被数据版本中35个分幅同步发布的情况不同，2023年6月发布的初始v7.0版本仅提供了25个南部分幅。10个北部分幅已于2024年7月作为v7.1版本发布，作为初始产品的补充，以完善标准的35个分幅。更多信息请参见《国家森林和稀疏木本植被数据元数据PDF（2022年发布版v7.1）》。