This PR fixes the lines that may raise the warning message.
Some variables may have zero-value and cause the warning message when division is applied.
To avoid this, this PR replaced value with very small value (i.e. 1e-10).
In addition, the warning message sometime occurred when the bursts only cover the water (ocean). So, to avoid this, the spatial water coverage is introduced, and the initial thresholds are computed only when the land and water coexists.
This PR fixes the lines that may raise the warning message.
Some variables may have zero-value and cause the warning message when division is applied. To avoid this, this PR replaced value with very small value (i.e. 1e-10).
In addition, the warning message sometime occurred when the bursts only cover the water (ocean). So, to avoid this, the spatial water coverage is introduced, and the initial thresholds are computed only when the land and water coexists.