2019
DOI: 10.3390/rs11192231
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Urban Flood Mapping Using SAR Intensity and Interferometric Coherence via Bayesian Network Fusion

Abstract: Synthetic Aperture Radar (SAR) observations are widely used in emergency response for flood mapping and monitoring. However, the current operational services are mainly focused on flood in rural areas and flooded urban areas are less considered. In practice, urban flood mapping is challenging due to the complicated backscattering mechanisms in urban environments and in addition to SAR intensity other information is required. This paper introduces an unsupervised method for flood detection in urban areas by syn… Show more

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Cited by 85 publications
(76 citation statements)
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“…Previous studies report good agreement between CCD flood extents and near coincident high-resolution optical images, crowdsourced reference points and inundation models [18]. Combined coherence and intensity achieved between 0.68 and 0.72 kappa in Li et al [48], which is greater than the kappa of 0.58 we achieved using coherence only ( Table 5). A second study using coherence and intensity achieved overall accuracies of 70% against hydraulic model simulations using intensity only, increasing to 79% when incorporating coherence [49].…”
Section: Discussionmentioning
confidence: 43%
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“…Previous studies report good agreement between CCD flood extents and near coincident high-resolution optical images, crowdsourced reference points and inundation models [18]. Combined coherence and intensity achieved between 0.68 and 0.72 kappa in Li et al [48], which is greater than the kappa of 0.58 we achieved using coherence only ( Table 5). A second study using coherence and intensity achieved overall accuracies of 70% against hydraulic model simulations using intensity only, increasing to 79% when incorporating coherence [49].…”
Section: Discussionmentioning
confidence: 43%
“…For urban CCD, as RCM data become more readily available, higher spatial and temporal resolutions will be evaluated over urban flood events. Promising results have been achieved integrating coherence and intensity data together [48,49]. We believe that a synergistic relationship between intensity and coherence could also be exploited with the aforementioned benefits associated with RCM data.…”
Section: Discussionmentioning
confidence: 95%
“…The dominant scatterers of the architectures were sometimes on the roof and could not be used to determine whether the area was flooded. Therefore, a more precise analysis and discussion would consider the building heights [26]. Those reasons that cause the detection ratio to become worse are common with the ideal Stripmap-based analysis.…”
Section: Discussionmentioning
confidence: 99%
“…Next, we calculated the coherence value with a 5 × 5 moving window and extracted the flooded area with a threshold of dγ = 0.3. These values were experimentally derived from preceding research [26,40,41]. Finally, we applied an iterative median filter with a 5 × 5 window for segmentation and acquired an inundation map.…”
Section: Interferometric Coherence Analysismentioning
confidence: 99%
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