From the dataset abstract

Comparison of flood extent based on Copernicus and Spottitt analysed Sentinel1 satellite imagery. Dates = 04/09/2019 and 03/09/2019 for Copernicus in Abaco.

Source: The Bahamas: Comparison of flood extent data from Sentinel 1 analysed by Spottitt and Copernicus. Spottitt imagery date = 04/09/2019, Copernicus imagery date = 04/09/2019 for Grand Bahama and 03/09/2019 for Abaco.