Publication

Floodwater Mapping in Urban Areas using SAR Data

2023

Abstract

Chini et al. in [1], developed an algorithm to automatically map urban floods from Synthetic Aperture Radar (SAR) data, which can function in near-real time worldwide. It has been tested on the extreme Pakistani floods, which started in the summer of 2022 and lasted for several months. This test case also served to study the characteristics of interferometric phase (in-phase) Standard Deviation (SD), to ensure the preservation of the original information. Then, using four classification methods: thresholding, region growing (RG), Bayesian network fusion (BNF) and BNF with RG, all the possible combinations between intensity, coherence and in-phase are tested to map floods in urban areas. For smaller areas (tens of square kilometers), it appears that in-phase SD does not add significantly more information. However, for larger areas (more than hundreds of square kilometers), the combination of the three SAR features in a BNF provides the best results.

Official source

https://infoscience.epfl.ch/entities/publication/5d8d056d-a532-4f55-b478-08c879d910ce

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2023

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5d8d056d-a532-4f55-b478-08c879d910ce

About this result

Related concepts (32)

Interferometric synthetic-aperture radar

Interferometric synthetic aperture radar, abbreviated InSAR (or deprecated IfSAR), is a radar technique used in geodesy and remote sensing. This geodetic method uses two or more synthetic aperture radar (SAR) images to generate maps of surface deformation or digital elevation, using differences in the phase of the waves returning to the satellite or aircraft. The technique can potentially measure millimetre-scale changes in deformation over spans of days to years.

Synthetic-aperture radar

Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional stationary beam-scanning radars. SAR is typically mounted on a moving platform, such as an aircraft or spacecraft, and has its origins in an advanced form of side looking airborne radar (SLAR).

Standard deviation

In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the values are spread out over a wider range. Standard deviation may be abbreviated SD, and is most commonly represented in mathematical texts and equations by the lower case Greek letter σ (sigma), for the population standard deviation, or the Latin letter s, for the sample standard deviation.

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Floodwater Mapping in Urban Areas using SAR Data

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