Innundation Frequency

Hanis Hasrin
Hanis Hasrin

April 16, 2023

Innundation Frequency

Satellite imagery before, during and after the flooding period were obtained from Water Observations from Space (WOfS), an online service providing surface water observations from satellite data for Australia from the year 1987 to present. An algorithm provided by Digital Earth Australia (DEA) Water Observations were then being used to classify each pixel from the LandSat satellite imagery previously obtained to further classify the pixels as either ‘wet’, ‘dry’ or ‘no-data’ pixels, with a threshold of at least 70% of the pixels being of either water (wet) or ground (dry). Subsequently, zonal statistics were being performed on the three selected imagery to calculate the percentage of water pixels covering each scenario, which was then being calculated using the ‘raster calculator’ function in ArcGIS Pro with the equation ‘sum/count * 100%’. Finally, maps were being produced via the ArcGIS Pro software, whereas graphs and tables were being made on Microsoft Excel.


Tools used

Zonal Statistics

Plug-ins used

ArcGIS

tags

Innundation Frequency

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