The <i>m‐chi</i> decomposition of hybrid dual‐polarimetric radar data with application to lunar craters

Raney, R. K.; Cahill, Joshua; Patterson, G. Wesley; Bussey, D. B. J.

doi:10.1029/2011je003986

Cited by 170 publications

(99 citation statements)

References 48 publications

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“…It is the ratio of the same-sense to opposite-sense circular polarization received power and allows measuring volumetric multiple scattering (Raney et al 2012;Shirvany, Chabert, and Tourneret 2012). A low degree of circularity (<1) is to be expected for a wave scattered off a slick-free sea surface, while significantly larger ζ values apply for the one backscattered by an oil slick-covered sea surface (>1).…”

Section: Compact-polarimetric Featuresmentioning

confidence: 99%

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SAR polarimetry for sea oil slick observation

Migliaccio

Nunziata

Buono

2015

International Journal of Remote Sensing

125

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In this article, a review of polarimetric synthetic aperture radar (SAR) methods for sea oil slick observation is presented. Marine oil pollution monitoring is a topic of great applicative and scientific relevance. In this framework, the use of remotely sensed measurements is of special interest and, in particular, the SAR because of its almost all-weather and all-day imaging capability at fine spatial resolution is the most effective tool. Conventional single-polarization SAR oil spill monitoring techniques are limited in their capability to detect oil slicks since they strongly rely on suitable thresholds, training samples, and ancillary information. Hence, an expert image analyst is due. The launch of a number of polarimetric SAR missions, along with the understanding of the peculiar physical mechanisms governing the scattering by an oil slick, led to a new paradigm (known as physical processing) that fostered a set of polarimetric algorithms particularly robust and efficient. Hence, suitable polarimetric models that exploit the departure from the slick-free sea Bragg scattering have been developed to effectively address oil slick monitoring. A set of polarimetric features extracted following such electromagnetic models have been proved to be reliable for oil slick monitoring. Polarimetric SAR observations led to a significant improvement in sea oil slick observation since they allow distinguishing oil slicks from a broad class of lookalikes in an unsupervised way. In addition, deeper information on the damping properties of the pollutant can be also inferred, which is of paramount importance for remediation purposes. Such physical processing has been demonstrated to be robust at variance of microwave carrier frequency, e.g. L-, C-, and X-band, and suitable to be exploited to extract information by dual-polarized, full-polarized, and compact modes. All these make such a physical approach of operational interest since it is able to exploit a larger set of SAR measurements building up a virtual constellation. In this review all these are detailed.

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Section: Compact-polarimetric Featuresmentioning

confidence: 99%

“…When considering the HP SAR architecture, to describe the polarization state of a randomly fluctuating wave backscattered off the observed scene, the circular polarization ratio ζ can be used (Raney et al 2012;Shirvany, Chabert, and Tourneret 2012):…”

Section: Compact-polarimetric Featuresmentioning

confidence: 99%

SAR polarimetry for sea oil slick observation

Migliaccio

Nunziata

Buono

2015

International Journal of Remote Sensing

125

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“…(iv)] indicates single or double bounce scatter, irrespective of the EM field is perfectly circular polarized or not (Kumar et al 2014). m-v decomposition (Raney et al 2010(Raney et al , 2012 of study area have been done in order to study its scattering mechanism. m-v decomposition technique developed by (Raney et al 2012) can differentiate material within ejecta deposits and their relative thickness.…”

Section: Ellipticity Anglementioning

confidence: 99%

“…m-v decomposition (Raney et al 2010(Raney et al , 2012 of study area have been done in order to study its scattering mechanism. m-v decomposition technique developed by (Raney et al 2012) can differentiate material within ejecta deposits and their relative thickness. In this (W) and ellipticity (v), which are a function of the semi-major and semi-minor axes, a and b.…”

Section: Ellipticity Anglementioning

confidence: 99%

Circular Polarization Characteristics of South Polar Lunar Craters using Chandrayaan-1 Mini-SAR and LRO Mini-RF

Calla¹,

Mathur²,

Jangid³

et al. 2015

Earth Moon Planets

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The paper presents a case study of inconsistent behaviour of Chandrayaan-1 Mini-SAR and LRO Mini-RF data over south polar lunar craters. The paper includes analysis of Stokes parameters and characterization of received time-varying electromagnetic fields over the south pole lunar craters. For the study, Chandrayaan-1 Mini-SAR and LRO Mini-RF data at 2.38 GHz are used. Total five lunar craters in south polar region are analyzed to study the effect of various parameters on the polarization of the signal. We have compared linear horizontal (LH) and linear vertical (LV) polarization components of received radar signal over the same targets using two different SAR data. Ratios of received LH to LV components are also derived over the five craters. It is observed that Chandrayaan-1 Mini-SAR is receiving high LH component as compared to LV component. This is not consistent with the scattering theory (Fawwaz et al. in Microwave remote sensing active and passive, Artech House Inc., New York, 1981), which states that for incidence angle greater than 15°, the vertical polarized component of a received signal should be always high as compared to horizontal polarized component over rough surfaces. These inconsistent results of Chandrayaan-1 Mini-SAR are observed over all five craters. In the paper, various effects of sensor parameters like incident angle, ellipticity angle, orientation angle etc. on scattering mechanism are discussed to understand the inconsistent behaviour of two SAR data over same target.

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“…It is generally believed that the slicks form a certain thickness of surface layer between sea and atmosphere [37,[46][47][48]; thus, the medium consists of three layers-atmosphere, oil slick, and seawater-divided by two special statistically rough interfaces (slick-air interface and slick-water interface) with many possibilities for multiple reflections and scattering in the middle layer. On the other hand, during the formation of continuous slow-release slicks, weathering and emulsification action on the continuous slow-release slick layer may result in oil-in-water emulsification or water -in-oil emulsification.…”

Section: Analysis Of Polarization Scattering Characteristicsmentioning

confidence: 99%

Analysis of Scattering Properties of Continuous Slow-Release Slicks on the Sea Surface Based on Polarimetric Synthetic Aperture Radar

Liu

et al. 2018

IJGI

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This study employs polarimetric synthetic aperture radar (Pol-SAR) to examine the scattering properties of continuous slow-release oil slicks on the sea surface. The objective is to extract and analyze the general polarization scattering properties of continuous slow-release slicks, i.e., those slicks that consist of substances released at a fairly slow and relatively constant rate, and to determine the influence of the slick formation process on these properties. Using multi-polarization feature parameters derived from the averaged coherency matrix, we find that the scattering mechanisms related to the continuous slow-release slicks differ from those of anthropogenic slicks, possibly as a result of the multiple scattering mechanisms that occur between the interfaces formed by the thick slick layer. Combinations of entropy (H) and modified anisotropy (A 12 ) are relatively robust parameters for identifying continuous slow-release slicks under different sea conditions, and may serve as a reference parameter for slick detection.

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The m‐chi decomposition of hybrid dual‐polarimetric radar data with application to lunar craters

Cited by 170 publications

References 48 publications

SAR polarimetry for sea oil slick observation

SAR polarimetry for sea oil slick observation

Circular Polarization Characteristics of South Polar Lunar Craters using Chandrayaan-1 Mini-SAR and LRO Mini-RF

Analysis of Scattering Properties of Continuous Slow-Release Slicks on the Sea Surface Based on Polarimetric Synthetic Aperture Radar

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