NSW Woody Vegetation Extent 2011

The NSW 5m Woody Extent is a state-wide binary classification of woody vegetation derived from multitemporal 5m SPOT-5 satellite imagery. The product broadly identifies isolated tree crowns as well as contigous forest at a 5m resolution.\r\n\r\nThis latest map of woody vegetation extent for NSW is the highest detailed to date. It shows the location and extent of woody vegetation in NSW for the year 2011. It can be used to identify small features such as paddock trees and trees in scattered woodlands, to the largest expanses of forest in the state. It is intended for use in non-urban environments and its accuracy for urban environments has not been assessed.\r\n\r\n\r\nThe dataset is also used as a spatial constraint for a seamless map of woody foliage projection cover (FPC). FPC is the fraction of the ground that is obscured by green leaf, and is a measure of density. The FPC dataset is delivered as a separate map to the woody extent (although it is constrained by it), and it can also be requested from the OEH data broker.\r\n\r\nThe woody extent product was derived from user-driven thresholds on an index of woody probability. The probability was calculated from a binomial logistic regression model on multi-temporal data. The model utilsed the statistics from SPOT-5 imagery over 2008-2012 and referenced over 26000 training points. Comprehensive manual corrections were also performed throughout 2013-2014 at a scale of 1:15000.\r\n\r\nThe dataset is provided in 8-bit raster format with the following attributes values:\r\n1 = Woody\r\n0 = Non-Woody\r\n255 = null (either outside the NSW boundary or a perennial water feature)\r\n\r\nOverall state accuracy is recorded at 90.1% when compared to Lidar datasets (see lineage for more information), and 88% when compared to 6670 visually derived validation points. Although this dataset has undergone extensive manual corrections, the accuracy for specific regions may vary considerably.\r\nhttp://www.auscover.org.au/xwiki/bin/view/Product+pages/nsw+5m+woody+extent+and+fpc

新南威尔士州5米分辨率木本覆盖范围数据集（NSW 5m Woody Extent）是一套全州范围的木本植被二分类产品，基于多时序5米分辨率SPOT-5卫星影像生成。该产品以5米分辨率可识别孤立树冠与连片森林两类地物。

这套最新的新南威尔士州木本植被覆盖范围图是目前精度最高的同类产品，完整呈现了2011年该州木本植被的分布与覆盖范围。其可用于识别包括牧场树木、零散林地林木在内的小型地物，乃至该州范围内连片的大型林区。本产品仅适用于非城市环境，其在城市环境中的精度尚未经过评估。

本数据集还可作为木本叶投影盖度（Foliage Projective Cover, FPC）无缝制图的空间约束条件。FPC指地面被绿色叶片遮挡的比例，是衡量植被密度的指标。叶投影盖度数据集与木本覆盖范围数据集独立发布（尽管其受后者的空间约束），也可通过OEH数据代理渠道申请获取。

木本覆盖范围产品基于木本概率指数，通过人工设定的阈值生成。该概率值通过多时序数据的二项逻辑回归模型计算得到，模型使用了2008-2012年间SPOT-5卫星影像的统计数据，并以超过26000个训练样本点作为参考。研究团队还于2013-2014年间以1:15000的比例尺开展了全面的人工修正工作。

本数据集采用8位栅格格式存储，其属性值定义如下：
1 = 木本植被
0 = 非木本植被
255 = 空值（位于新南威尔士州边界外，或为常年水体）

与激光雷达（Lidar）数据集对比后，本数据集的全州总体精度为90.1%（详细信息请参见数据谱系说明）；与6670个目视解译验证点对比后，其精度为88%。尽管本数据集已经过大量人工修正，但其在特定区域的精度仍可能存在较大波动。
http://www.auscover.org.au/xwiki/bin/view/Product+pages/nsw+5m+woody+extent+and+fpc