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Date of Images:<\/SPAN><\/P>

5/6/2024<\/SPAN><\/P>

Date of Next Image:<\/SPAN><\/P>

Unknown<\/SPAN><\/P>

Summary:<\/SPAN><\/P>

The floodwater depth raster produced for the 06th May 2024 for long-term floods in southern Brazil was generated using the Flood Water Depth Estimation Tool (Cohen et al, 2018, 2019; Peter et al, 2020). The Floodwater Depth Estimation Tool (FwDET) is a solution for producing timely floodwater depth data during flood activations that require emergency response and post-flood assessment.<\/SPAN><\/P>

FwDET is solely on a flood extent layer and a digital elevation model (DEM). The DEM used here was the NASA SRTM data. The computation involves identifying elevations at the boundaries of the flood extent layer and using those elevations to assign floodwater surface elevation to each cell within the flooded domain by identifying its nearest boundary cell. The modeled flood surface elevation is then subtracted from the original DEM to retrieve depth.<\/SPAN><\/P>

The results posted here are preliminary and unvalidated results, primarily intended to aid the field response and people who wanted to have a rough first look at the inundation depth. The ARIA-share website has always focused on posting preliminary results as fast as possible for disaster response. The flood depth map may contain errors due to inaccurate elevations in the NASA SRTM DEM or the water surface estimation.<\/SPAN><\/P>

Data Sources:<\/SPAN><\/P>

OPERA Dynamic Surface Water eXtent Harmonized Landsat Sentinel-2 (DSWx- HLS) - based flood inundation extent raster generated by the ARIA/OPERA group at NASA JPL. <\/SPAN><\/P>

NASA SRTM (Shuttle Radar Topography Mission) Digital Elevation 30 m (openly available on Google Earth Engine)<\/SPAN><\/P>

Suggested Use:<\/SPAN><\/P>

The darkest shades of blue indicate where the product is estimating the largest floodwater depth, while lighter shades indicate shallower flooding<\/SPAN><\/P>

The results posted here are preliminary and unvalidated results, primarily intended to aid the field response and people who wanted to have a rough first look at the inundation depth. The ARIA-share website has always focused on posting preliminary results as fast as possible for disaster response. The flood depth map may contain errors due to inaccurate elevations in the NASA SRTM DEM or the water surface estimation.<\/SPAN><\/P>

Satellite/Sensor:<\/SPAN><\/P>

Harmonized Landsat Sentinel-2 (HLS)<\/SPAN><\/P>