Table 2 Flooding trends over time

From: Mapping global floods with 10 years of satellite radar data

Scenario

Est. Trend

p-val

All Data

6% ± 2%

0.0005

2022 Removed

5% ± 2%

0.01

2022 and pre-June 2017 Removed

2% ± 3%

0.5

  1. Estimated trends, uncertainties (one standard deviation), and p values for flood extent. In general we see evidence for a positive trend, though the results are not statistically significant in the third, most pessimistic scenario. We estimated the trend under different scenarios. The first row (All Data) is where we include all time series data. In the second row, we remove 2022 as a potential outlier because it has much higher average flood extent than other years. Removing it removes the estimated trend slightly. The last row is if we exclude both 2022 and data prior to June 2017. Before
  2. June 2017 many of the observations were made with only one of two observations channels, resulting in different rates of flood detection. This further reduces the estimated trend in flood extent over time. We view the middle row, where we only remove 2022 as a potential outlier, as our current best estimate.
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