Digital Earth Australia Water Observations Multi-Year Summary – Water Frequency

Abstract The Digital Earth Australia Water Observations Multi-Year Summary - Water Frequency dataset shows the percentage of clear satellite observations that were detected as wet. This is the ratio of wet to clear observations as a percentage. This dataset helps track where water is located and how it changes over time. 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 Frequency category that the pixel is assigned to. ───────────────┼───────┼──────────┼───────┼──────────────────────────────────────────────────────────────────────── Water Frequency│float32│30 m │NaN │What percentage of clear observations were detected as wet. ───────────────┼───────┼──────────┼───────┼──────────────────────────────────────────────────────────────────────── DEA Product ID │text │ │ │ga_ls_wo_fq_myear_3 ───────────────┴───────┴──────────┴───────┴──────────────────────────────────────────────────────────────────────── Contact Digital Earth Australia, [earth.observation@ga.gov.au]