Digital Earth Australia Water Observations Multi-Year Summary – Wet Count

Abstract The Digital Earth Australia Water Observations Multi-Year Summary - Wet Count dataset shows how often water was detected in clear satellite images. This dataset is part of the DEA Water Observations Statistics (WO-STATS) suite, which includes: Water Frequency - The percentage of clear observations where water was detected. Clear Count - The number of times an area could be clearly seen. Wet Count - The number of times that water was detected in clear observations. The dataset uses Landsat satellite data from 1986 to the present. It helps understand environmental processes like drought by showing where water has been observed in the landscape in the past. This supports water resource planning and environmental management across Australia. For more information see the DEA Knowledge Hub product page. Currency Date modified: April 2026 Modification frequency: Annually Data Extent Spatial extent North: -6° South: -47° East: 170° West: 95° Temporal Coverage: 1987 to 2025 Version: 2.1.0 Source Information Download the data from Amazon Web Services (AWS) To explore the DEA Water Observations Multi Year Summary data use the DEA Water Observations Multi-Year Summary Explorer App Lineage Statement This product is made from the DEA Water Observations (Landsat) product. Each pixel location is analysed statistically to derive both the count of clear observations and the count of clear-wet observations, and these are used to calculate the percentage of clear observations that were also wet. This provides a ‘normalised’ water frequency dataset. Data citation Mueller, N. 2022. Geoscience Australia Landsat Water Observation Statistics Collection 3. Geoscience Australia, Canberra. Access the dataset via DOI: https://dx.doi.org/10.26186/146091 Publication Mueller, N., Lewis, A., Roberts, D., Ring, S., Melrose, R., Sixsmith, J., Lymburner, L., McIntyre, A., Tan, P., Curnow, S., & Ip, A. (2016). Water observations from space: Mapping surface water from 25 years of Landsat imagery across Australia. Remote Sensing of Environment, 174, 341–352. Read the full article in Remote Sensing of Environment https://doi.org/10.1016/j.rse.2015.11.003 Data Dictionary Attribute name Type Resolution No-data Description Name text The file name of the image. Category text Indicates image as Primary or Overview. ClassName int The Water Observations Wet Count category that the pixel is assigned to. Wet Count int16 30 m -999 How many times water was detected in observations that were clear. DEA Product ID text ga_ls_wo_fq_myear_3 Contact Digital Earth Australia, [e-mail]摘要 澳大利亚数字地球（Digital Earth Australia，以下简称DEA）水体观测多年度汇总——湿区计数数据集展示了清晰卫星影像中水体被检测到的频次。本数据集属于DEA水体观测统计（Water Observations Statistics，简称WO-STATS）套件的组成部分，该套件包含： 水体频率（Water Frequency）：检测到水体的清晰观测占比； 清晰观测计数（Clear Count）：某区域被清晰观测到的总次数； 湿区计数（Wet Count）：清晰观测中检测到水体的次数。 本数据集采用1986年至今的陆地卫星（Landsat）数据，通过展示历史景观中被观测到水体的位置，助力理解干旱等环境过程，可为澳大利亚全国范围内的水资源规划与环境管理提供支撑。更多信息请参阅DEA知识中心（DEA Knowledge Hub）产品页面。 数据时效性 修改日期：2026年4月 更新频率：每年一次 数据范围 空间范围：北纬-6°，南纬-47°，东经170°，西经95° 时间覆盖范围：1987年至2025年 版本：2.1.0 来源信息 可从亚马逊云科技（Amazon Web Services, 简称AWS）下载本数据集。如需浏览DEA水体观测多年度汇总数据，请使用DEA水体观测多年度汇总数据浏览应用程序。 产品溯源说明 本产品基于DEA水体观测（陆地卫星Landsat）产品生成。通过对每个像素点位进行统计分析，分别推导得到清晰观测次数与清晰且检测到水体的观测次数，并以此计算出清晰观测中同时存在水体的占比，最终生成归一化水体频率数据集。 数据引用 Mueller, N. 2022. 澳大利亚地球科学局陆地卫星水体观测统计数据集第3版. 澳大利亚地球科学局, 堪培拉。 可通过以下DOI获取本数据集：https://dx.doi.org/10.26186/146091 发表文献 Mueller, N.、Lewis, A.、Roberts, D.、Ring, S.、Melrose, R.、Sixsmith, J.、Lymburner, L.、McIntyre, A.、Tan, P.、Curnow, S. 与Ip, A. (2016). 太空水体观测：基于25年陆地卫星影像绘制澳大利亚全国地表水分布图. 《环境遥感》(Remote Sensing of Environment), 174, 341–352。 可访问以下链接阅读全文：https://doi.org/10.1016/j.rse.2015.11.003 数据字典 属性名 类型 分辨率 无数据值 说明 Name 文本 - - 影像文件名。 Category 文本 - - 标识影像为"Primary"（主影像）或"Overview"（概览影像）。 ClassName 整数型 - - 像素所属的水体观测湿区计数类别。 Wet Count 16位整数 30米 -999 清晰观测中检测到水体的次数。 DEA产品ID 文本 - - ga_ls_wo_fq_myear_3。 联系方式 澳大利亚数字地球，邮箱：[e-mail]