Greater Sydney Region Tree Canopy to Modified Mesh Block 2022

The Greater Sydney Region Tree Canopy to Modified Mesh Block 2022 provides both an area and percentage of canopy for city blocks and infrastructure corridors in the Greater Sydney Region as of 2022. With this dataset users can estimate tree canopy for many geographic areas (map scales), from larger local government area and precincts down to mesh block (ABS) and modified mesh block (smallest scale). The geographic extent of the 2022 canopy cover dataset includes the metropolitan urban area and metropolitan rural area of Greater Sydney.  Having current and accurate estimates of tree canopy supports citizens and governments to reliably identify areas of tree canopy and confidently develop urban greening and heat island mitigation strategies and actions. \r\n\r\nThis dataset provides the user with information at a known spatial accuracy. The dataset uses vegetation information derived from 0.48m resolution ArborCarbon Pty Ltd height stratified vegetation cover data combined with boundary and land use information from the Australian Bureau of Statistics (ABS) Mesh Block polygon dataset. \r\n\r\nThe Greater Sydney Region Tree Canopy to Modified Mesh Block 2022 dataset uses the Modified Mesh Block boundaries from the ‘Greater Sydney Region Tree Canopy to Modified Mesh Block 2019’ dataset. Care should be taken when comparing canopy cover between datasets, especially in LGAs with a lower proportion of Metropolitan Urban Area, as some observed differences may be a result of variations in methodologies rather than actual change in canopy cover.\r\n\r\nIn the dataset, “tree canopy” is classified as all vegetation greater than 3m. “All vegetation” includes all vegetation, including tree canopy, greater than 0m. Note: due to data limitations, not all grass areas have been identified in their entirety.

《2022年大悉尼地区树冠覆盖至修正统计区块》数据集提供了截至2022年大悉尼地区城市街区与基础设施廊道的树冠覆盖面积及占比数据。借助该数据集，用户可对多类地理区域（按地图比例尺划分）的树冠覆盖情况进行估算，覆盖范围从较大的地方政府辖区（Local Government Area, LGA）及片区，直至澳大利亚统计局（Australian Bureau of Statistics, ABS）统计区块（Mesh Block）与修正统计区块（Modified Mesh Block，为最小统计尺度）。本2022年树冠覆盖数据集的地理覆盖范围涵盖大悉尼地区的都会城区与都会乡村区域。获取准确且时效性强的树冠覆盖估算数据，有助于民众与政府部门精准识别树冠覆盖区域，并稳妥制定城市绿化与热岛效应减缓策略及实施行动。

本数据集提供的信息具备明确的空间精度。该数据集的植被数据源自分辨率为0.48米的ArborCarbon Pty Ltd高度分层植被覆盖数据，并结合了澳大利亚统计局（ABS）统计区块（Mesh Block）多边形数据集的边界与土地利用信息。

《2022年大悉尼地区树冠覆盖至修正统计区块》数据集沿用了《2019年大悉尼地区树冠覆盖至修正统计区块》数据集的修正统计区块（Modified Mesh Block）边界。在不同数据集间进行树冠覆盖对比时需格外谨慎，尤其是在都会城区占比较低的地方政府辖区（LGA）内，因为观测到的部分差异可能源于方法学差异，而非树冠覆盖的实际变化。

本数据集将"树冠覆盖"定义为所有高度超过3米的植被。"所有植被"则涵盖所有高度大于0米的植被，其中包含树冠覆盖植被。注：受数据局限性影响，并非所有草地区域均已被完整识别。