Comparative flood area analysis of C-band VH, VV, and L-band HH polarizations SAR data

Manavalan, R.; Rao, Y. S.; Mohan, B. Krishna

doi:10.1080/01431161.2017.1325534

Cited by 23 publications

(12 citation statements)

References 10 publications

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“…It is evident for any SAR image-based flood area mapping applications; data from a high-frequency SAR sensor is the most preferable choice. 29 With the available X-, C-, and L-band spaceborne SAR sensors, the flood area mapping results that have been derived using L-band SAR is exhibiting promising results as L-band SAR is able to map more inundated regions than X-or C-band SAR data. The deeper penetration capabilities of L-band SAR help better discrimination of the ground features as well as in mapping additional inundated regions that cannot be observed in Cor X-band SAR data.…”

Section: Resultsmentioning

confidence: 99%

“…[65][66][67] Among polarization data, it has been widely accepted that HH polarization is preferred due to its high radiometric dynamic, less backscattering nature, and reduced sensitivity to water surface. 3,23,29,62,63,68 For flood area mapping application, VV polarization SAR data are generally avoided due to its known nature for enhanced volume scattering, high speckles presence as well as lack of canopy penetration. Studies that use VH and HV polarization data exhibit better results than VV polarization data due to the reduced nature of scattering and speckles.…”

Section: Resultsmentioning

confidence: 99%

“…28 The L-band SAR signals (15 to 30 cm) exhibit more promising results in identifying the inundated status of agricultural regions than the C-band SAR image due to its long wavelength. 29 The higher the frequency of SAR signals the higher penetration capability, hence the inundated status of a disaster region can be mapped well when using high-frequency SAR data.…”

Section: Sar Signal Response Over the Inland Water Bodiesmentioning

confidence: 99%

“…In line with this Manavalan et al have analyzed SAR data of HH, VH, and VV polarization data of the same as well as different geographical regions. 29,70 A comparative flood area assessment of the same flood event covering the same geographical region has been analyzed using C-band ENVISAT ASAR of VH and VV polarization and L-band HH polarization data of ALOS-1 PALSAR satellite. 29 For the remote location, the available Cband ENVISAT HH polarization data have been analyzed.…”

Section: Sar Signal Response Over Flooded Urban Regionmentioning

confidence: 99%

“…29,70 A comparative flood area assessment of the same flood event covering the same geographical region has been analyzed using C-band ENVISAT ASAR of VH and VV polarization and L-band HH polarization data of ALOS-1 PALSAR satellite. 29 For the remote location, the available Cband ENVISAT HH polarization data have been analyzed. 70 These analyses suggest that in the absence of a HH polarization image, the crosspolarization images of VH and HV data are the preferred choice of data for flood area mapping application.…”

Section: Sar Signal Response Over Flooded Urban Regionmentioning

confidence: 99%

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Review of synthetic aperture radar frequency, polarization, and incidence angle data for mapping the inundated regions

Manavalan

2018

J. Appl. Rem. Sens.

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The use and importance of synthetic aperture radar (SAR) data for flood area mapping studies have been proved beyond the doubts as SAR signals are able to penetrate the thick formation of clouds and are able to receive the reflected signals of surface objects even during extreme weather conditions. At the same time, the accuracies of an SAR image-based flood area mapping model has a direct relationship with the frequency of the source SAR signal, the polarization mode that has been used, and the incidence angle by which the disaster region has been sensed. In addition to this, while evolving SAR image-based flood area mapping models, it is a must to understand the response of the inundated regions of the different geographical regions, as well as the response of the same geographical region during different climatic and seasonal periods as the same object, produces different signatures in varying situations. As of this date, there is no single article that can synchronize such information, which is widely disseminated across various research publications. This article mainly focuses on gathering and reviewing such vital information as well as bringing out the details about the physical basis of the interaction of the radar signal with various water surfaces of different geographical conditions, the response of inundated regions under different frequency, polarization, and incidence angle. Such information is mainly used to understand the difficulties that arise when mapping the inundated regions using the SAR image. In the end, the significant observations of the literature reviews are highlighted, which is very useful for young researchers who are interested in building flood area application models using different sets of SAR data.

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Section: Resultsmentioning

confidence: 99%