STORRE Collection: Electronic copies of Biological and Environmental Sciences conference papers and proceedings.Electronic copies of Biological and Environmental Sciences conference papers and proceedings.http://hdl.handle.net/1893/11752024-03-29T01:27:34Z2024-03-29T01:27:34ZDetermining Iceberg Scattering Mechanisms in Greenland Using Quad Pol ALOS-2 SAR DataBailey, JohnsonMarino, ArmandoAkbari, Vahidhttp://hdl.handle.net/1893/337832022-03-29T00:00:31Z2021-01-01T00:00:00ZTitle: Determining Iceberg Scattering Mechanisms in Greenland Using Quad Pol ALOS-2 SAR Data
Author(s): Bailey, Johnson; Marino, Armando; Akbari, Vahid
Abstract: Iceberg properties, together with meteorological and environmental conditions can influence Synthetic Aperture Radar (SAR) backscatter behaviours. In this work, we used five images of quad-pol ALOS-2/PALSAR-2 SAR data to analyse icebergs in Greenland. We investigate the scattering mechanisms through several observables and decompositions. Our results show that the most common scattering mechanisms for icebergs is surface scattering and volume scattering. Sometimes double bounce is also observed. By performing a multi-scale analysis using boxcar 5×5 and 11×11 window sizes, we conclude that icebergs can be a collection of strong scatterers. This gives hope for using quad-pol polarimetry to provide some iceberg classifications in the future.2021-01-01T00:00:00ZMonitoring Surfactants Pollution Potentially Related to Plastics in the World Gyres Using Radar Remote SensingSimpson, MorganMarino, Armandode Maagt, PeterGandini, ErioHunter, PeterSpyrakos, EvangelosTyler, AndrewAckermann, NicolasHajnsek, IrenaNunziata, FerdinandoTelfer, Trevorhttp://hdl.handle.net/1893/335622022-05-21T00:06:02Z2021-01-01T00:00:00ZTitle: Monitoring Surfactants Pollution Potentially Related to Plastics in the World Gyres Using Radar Remote Sensing
Author(s): Simpson, Morgan; Marino, Armando; de Maagt, Peter; Gandini, Erio; Hunter, Peter; Spyrakos, Evangelos; Tyler, Andrew; Ackermann, Nicolas; Hajnsek, Irena; Nunziata, Ferdinando; Telfer, Trevor
Abstract: Plastics within the ocean have been found to be colonised by microorganisms that, as a by-product of their metabolism, produce surfactants. Short capillary waves on the sea surface can get dampened due to the increased surface elasticity of these surfactants. Radar satellites are sensitive to surface roughness and can therefore detect the dampening of these waves. This research investigates areas inside the Atlantic, Pacific and Indian Ocean gyres using ESA Sentinel-1 and DLR TerraSAR-X data. We found out that we can observe several surfactant instances in the gyres and these are not correlated to medium or high level of chlorophyll. We can exclude that they have origin in biogenic slicks. Among other possible unknown origins, we hypothesise that these surfactants are produced from plastic concentrations within the ocean.2021-01-01T00:00:00ZCharacterization of Natural Wetlands with Cumulative Sums of Polarimetric Sar TimeseriesRuiz-Ramos, JavierMarino, ArmandoBerardi, AndreaHardy, AndySimpson, Matthewhttp://hdl.handle.net/1893/335052021-10-21T00:18:12Z2021-01-01T00:00:00ZTitle: Characterization of Natural Wetlands with Cumulative Sums of Polarimetric Sar Timeseries
Author(s): Ruiz-Ramos, Javier; Marino, Armando; Berardi, Andrea; Hardy, Andy; Simpson, Matthew
Abstract: Wetlands are among the most productive natural ecosystems in the world, generally being important biodiversity hotspots. However, the complex nature of these landscapes together with the fragile and dynamic relationships among the organisms inhabiting these regions, make wetland ecosystems especially vulnerable to environmental disturbance, such as climate change. Thus, developing new automated systems which allow continuous monitoring and mapping of wetland dynamics is crucial for preserving their natural health. Synthetic aperture radar (SAR) systems have proven useful in monitoring and mapping the hydrological processes of wetland ecosystems through the use of polarimetric change detection techniques. Nonetheless, most of these flood change detectors rely on static detection approaches, generally covering a limited period of time (e.g., pre and post flooding scenario comparison), thus failing in providing continuous information about the diverse hydrological mechanisms. In this context, this research presents a novel approach for monitoring the hydrological dynamics of wetlands in a continuous and near-real-time manner using dense Sentinel-1 image time-series. In this work, we have enhanced our recently developed algorithm based on cumulative sums (SAR-CUSUM), to include polarimetric information, which allows to classify the type of change due to the flood. The new processing stack exploits the polarimetric information of dual-pol Sentinel-1 dense time series for detecting floods and provide some separation between open water and flooded vegetation areas. The outcomes derived from this study emphasize the capabilities of dense SAR time-series for environmental monitoring while providing a useful tool which could be integrated into rapid response and wetland conservation management plans.2021-01-01T00:00:00ZMonitoring Harsh Coastal Environments Using Polarimetric Sar Data: The Case of Solway Firth WetlandsNunziata, FerdinandoFerrentino, EmanueleMarino, ArmandoBuono, AndreaMigliaccio, Mauriziohttp://hdl.handle.net/1893/331312021-08-24T00:04:01Z2021-01-01T00:00:00ZTitle: Monitoring Harsh Coastal Environments Using Polarimetric Sar Data: The Case of Solway Firth Wetlands
Author(s): Nunziata, Ferdinando; Ferrentino, Emanuele; Marino, Armando; Buono, Andrea; Migliaccio, Maurizio
Abstract: In this study, the capability of polarimetric Synthetic Aperture Radar (SAR) measurements to monitor harsh coastal areas is addressed. A meaningful showcase is presented that refers to the Scottish Solway Firth (SF) wetlands, an important coastal ecosystem severely affected by extreme weather conditions. Experiments are undertaken on a pair of full-polarimetric (FP) C-band RadarSAT-2 SAR images collected over SF during July and November 2018 in order to both extract the coastal profile and to identify changes in the scattering behavior along the coastal strip. The results demonstrate the soundness of the proposed approach and the role played by FP SAR measurements to effectively support vulnerability and risk assessments in harsh coastal environments.2021-01-01T00:00:00Z