DEA Water Observations Statistics (Landsat) Version 2.0.0

These are the statistics generated from the DEA Water Observations (Water Observations from Space) suite of products, which gives summaries of how often surface water was observed by the Landsat satellites for various periods (per year, per season and for the period from 1986 to 2023).<br>The spatial extent is all Australia and the spatial resolution is 30 m x 30 m.<br>DEA Water Observations Statistics is available in multiple forms, depending on the length of time over which the statistics are calculated. At present the following are available:<strong>- DEA WO Multi-Year:</strong> ga_ls_wo_fq_myear_3: statistics calculated from the full depth of time series (1986 to 2023) unfiltered<strong>- DEA WO Calendar Year:</strong> ga_ls_wo_fq_cyear_3: statistics calculated from each calendar year (1986 to present)<strong>- DEA WO November to March:</strong> ga_ls_wo_fq_nov_mar_3: statistics calculated yearly from November to March (1986 to present)<strong>- DEA WO April to October:</strong> ga_ls_wo_fq_apr_oct_3: statistics calculated yearly from April to October (1986 to present)<br>Each dataset in this product contains the following information:- Clear Count: how many times an area could be clearly seen (i.e. not affected by clouds, shadows or other satellite observation problems)- Wet Count: how many times water was detected in observations that were clear- Water Summary: what percentage of clear observations were detected as wet (i.e. the ratio of wet to clear as a percentage)<br>As no confidence filtering is applied to this product, it is affected by noise where misclassifications have occurred in the input water classifications, and can be difficult to interpret on its own. The confidence layer and filtered summary are contained in the Water Observations Filtered Statistics product, which provides a noise-reduced view of the all-of-time water summary.<br>Band names:- <strong>count_wet: </strong>how many times water was detected in observations that were clear.- <strong>count_clear: </strong> how many times an area could be clearly seen.- <strong>frequency: </strong>what ratio of clear observations were detected as wet (represented as a number between 0 and 1 corresponding to 0 to 100% of observations)