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The degree of uncertainty caused by errors in the input dataset depends largely on the topographical characteristics of the area and can be large for flat areas with low terrain slopes. Mainly locational errors of Tweets and errors in the elevation data affect these locations. Since fluctuations in water levels have less of an effect in areas with steep terrain slopes, the uncertainty in these areas remains relatively limited. Also the uncertainties caused by errors in the water depth mentioned by the Tweets and default water depth added to observations without a water depth was found to have only a minor influence on the uncertainty in flood extent.
Operationalization
Some recommendations for operationalization of the Tier III method are made in this memo.
Furter reading
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