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Classifiers for the Detection of Flood-Prone Areas Using Remote Sensed Elevation Data

Degiorgis, Massimiliano and Gnecco, Giorgio and Gorni, Silvia and Roth, Giorgio and Sanguineti, Marcello and Taramasso, Angela Celeste Classifiers for the Detection of Flood-Prone Areas Using Remote Sensed Elevation Data. Journal of Hydrology, 470-1. pp. 302-315. ISSN 0022-1694 (2012)

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Summary A technique is presented for the identification of the areas subject to flooding hazard. Starting from remote sensed elevation data and existing flood hazard maps – usually available for limited areas – the relationships between selected quantitative morphologic features and the flooding hazard are first identified and then used to extend the hazard information to the entire catchment. This is performed through techniques of pattern classification, such as linear classifiers based on quantitative morphologic features, and support vector machines with linear and Gaussian kernels. The experiment starts by discriminating between flood-prone areas and marginal hazard areas. Multiclass classifiers are subsequently used to graduate the hazard. Their designs amount to solving suitable optimization problems. Several performance measures are considered in comparing the different classifiers, such as the area under the receiver operating characteristics curve, and the sum of the false positive and false negative rates. The procedure has been validated for the Tanaro basin, a tributary to the major Italian river, the Po. Results show a high reliability: the classifier properly identifies 93 of flood-prone areas, and only 14 of the areas subject to a marginal hazard are improperly assigned. An increase of this latter value up to 19 is detected when the same structure is applied for hazard graduation. Results derived from the application to different catchments seem to qualitatively indicate the ability of the classifier to perform well also outside the calibration region. Pattern classification techniques should be considered when the identification of flood-prone areas and hazard grading is required for large regions (e.g., for civil protection or insurance purposes) or when a first identification is needed (e.g., to address further detailed flood-mapping activities).

Item Type: Article
Identification Number: 10.1016/j.jhydrol.2012.09.006
Uncontrolled Keywords: Flood hazard; Flood risk management; Receiver operating characteristics; Linear classifiers and support-vector machines; Parameter optimization; Shuttle radar topography mission
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Research Area: Computer Science and Applications
Depositing User: Giorgio Gnecco
Date Deposited: 17 Sep 2013 07:43
Last Modified: 17 Sep 2013 07:43
URI: http://eprints.imtlucca.it/id/eprint/1753

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