RETIRED Water Observations from Space Filtered Statistics 25m 2.1.5

This record was retired 15/09/2022 with approval from S.Oliver as it has been superseded by eCat 146091 DEA Water Observations Statistics (Landsat)In previous versions of WOfS, the basic water classifications, statistical summaries and confidence products were contained within one product with several datasets. As of version 2.1.5, WOfS is split into three products: Water Observation Feature Layers (WO_25_2.1.5), Summary Statistics (WO-STATS_25_2.1.5), and Filtered Summary Statistics (WO-FILT-STATS_25_2.1.5).This product is Water Observations from Space - Filtered Statistics (WO-FILT-STATS), consisting of a Confidence layer that compares the WO-STATS water summary to other national water datasets, and the Filtered Water Summary which uses the Confidence to mask areas of the WO-STATS water summary where Confidence is low. The Filtered Water Summary provides the long term understanding of the recurrence of water in the landscape, with much of the noise due to misclassification filtered out. WO-FILT-STATS consists of the following datasets:Confidence: the degree of agreement between water shown in the Water Summary and other national datasets. The Confidence layer provides understanding of whether the water shown in the Water Summary agrees with where water should exist in the landscape, such as due to sloping land or whether water has been detected in a location by other means. Filtered Water Summary: A simplified version of the Water Summary, showing the frequency of water observations where the Confidence is above a cutoff level. This layer gives a noise-reduced view of surface water across Australia.Even though confidence filtering is applied to the Filtered Water Summary, some cloud and shadow, and sensor noise does persist.

本数据集已于2022年9月15日经S.Oliver批准退役，因其已被eCat 146091 DEA 水体观测统计（Landsat）取代。
在过往版本的WOfS（太空水体观测系统，Water Observations from Space）中，基础水体分类结果、统计汇总产品与置信度产品均整合至一个包含多个子数据集的单一产品内。自2.1.5版本起，WOfS拆分为三个独立产品：水体观测特征图层（Water Observation Feature Layers，WO_25_2.1.5）、统计汇总数据集（Summary Statistics，WO-STATS_25_2.1.5）以及过滤式统计汇总数据集（Filtered Summary Statistics，WO-FILT-STATS_25_2.1.5）。
本产品为太空水体观测-过滤式统计数据集（Water Observations from Space - Filtered Statistics，WO-FILT-STATS），包含两类核心子数据集：其一为置信度图层，用于比对WO-STATS水体汇总结果与其他国家级水体数据集；其二为过滤式水体汇总结果，该数据集通过置信度图层对WO-STATS水体汇总中置信度较低的区域进行掩膜处理。过滤式水体汇总结果可用于长期分析地表水体的重现规律，同时过滤掉大部分由分类误判带来的噪声。
WO-FILT-STATS包含以下两类数据集：
1. 置信度图层：表征水体汇总结果中显示的水体与其他国家级水体数据集之间的吻合程度。该图层可用于判断水体汇总结果中的水体区域是否与地表实际应存在的水体区域相符，例如受地形坡度影响的区域，或通过其他途径检测到水体的位置。
2. 过滤式水体汇总结果：为水体汇总结果的简化版本，展示置信度高于设定阈值的水体观测频次。该图层可呈现澳大利亚全境经噪声抑制后的地表水体分布情况。
尽管已对过滤式水体汇总结果应用置信度过滤算法，但仍存在部分云、阴影及传感器噪声残留。