Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems

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The aim of this paper is to assess the use of RADARSAT SAR data for wetland ecosystem identification considering the influence of target features (vegetation type, flood conditions, phenology, and fires), as well as sensor parameters (varying incidence angles). The Lower Delta islands of the Paraná...

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Autores principales:	Kandus, P., Karszenbaum, H., Pultz, T., Parmuchi, G., Bava, J.
Formato:	JOUR
Materias:	Biology Ecosystems Electromagnetic wave attenuation Electromagnetic wave backscattering Fires Flood damage Forestry Radar imaging Synthetic aperture radar Vegetation Wetlands Flood conditions Incidence angle effect Radar backscatter Wetland ecosystems Remote sensing Electromagnetic Radiation Floods Forests Phenology Plants Radar
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_07038992_v27_n6_p651_Kandus
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_07038992_v27_n6_p651_Kandus
record_format	dspace
spelling	todo:paper_07038992_v27_n6_p651_Kandus2023-10-03T15:36:08Z Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems Kandus, P. Karszenbaum, H. Pultz, T. Parmuchi, G. Bava, J. Biology Ecosystems Electromagnetic wave attenuation Electromagnetic wave backscattering Fires Flood damage Forestry Radar imaging Synthetic aperture radar Vegetation Wetlands Flood conditions Incidence angle effect Radar backscatter Wetland ecosystems Remote sensing Ecosystems Electromagnetic Radiation Fires Floods Forests Phenology Plants Radar The aim of this paper is to assess the use of RADARSAT SAR data for wetland ecosystem identification considering the influence of target features (vegetation type, flood conditions, phenology, and fires), as well as sensor parameters (varying incidence angles). The Lower Delta islands of the Paraná River in Argentina were selected as the study area. Six SAR images acquired during the summer and winter of 1997 and 1998 were used. This set includes Standard Beams S1, S4 and S6 to account for the incidence angle effect. Radar backscatter of samples taken at known sites was analyzed. The forest backscatter signal shows temporal stability during summer and winter, either with leaf-on or leaf-off trees. On the contrary, backscattering from forest is strongly enhanced by underlying water. Radar returns were found to change from an attenuated signal to one dominated by double-bounce behaviour. In wetlands dominated by rushes, the dominant interaction mechanism may change from double-bounce to specular reflection due to flood. During normal water-level conditions, the ability to differentiate forest from herbaceous vegetation was found to decrease with increasing incidence angle. Under extreme flooding, radar backscattering decreases from steep to shallow incidence angles, about 3 dB for forest, and 4 dB for rushes. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07038992_v27_n6_p651_Kandus
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Biology Ecosystems Electromagnetic wave attenuation Electromagnetic wave backscattering Fires Flood damage Forestry Radar imaging Synthetic aperture radar Vegetation Wetlands Flood conditions Incidence angle effect Radar backscatter Wetland ecosystems Remote sensing Ecosystems Electromagnetic Radiation Fires Floods Forests Phenology Plants Radar
spellingShingle	Biology Ecosystems Electromagnetic wave attenuation Electromagnetic wave backscattering Fires Flood damage Forestry Radar imaging Synthetic aperture radar Vegetation Wetlands Flood conditions Incidence angle effect Radar backscatter Wetland ecosystems Remote sensing Ecosystems Electromagnetic Radiation Fires Floods Forests Phenology Plants Radar Kandus, P. Karszenbaum, H. Pultz, T. Parmuchi, G. Bava, J. Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
topic_facet	Biology Ecosystems Electromagnetic wave attenuation Electromagnetic wave backscattering Fires Flood damage Forestry Radar imaging Synthetic aperture radar Vegetation Wetlands Flood conditions Incidence angle effect Radar backscatter Wetland ecosystems Remote sensing Ecosystems Electromagnetic Radiation Fires Floods Forests Phenology Plants Radar
description	The aim of this paper is to assess the use of RADARSAT SAR data for wetland ecosystem identification considering the influence of target features (vegetation type, flood conditions, phenology, and fires), as well as sensor parameters (varying incidence angles). The Lower Delta islands of the Paraná River in Argentina were selected as the study area. Six SAR images acquired during the summer and winter of 1997 and 1998 were used. This set includes Standard Beams S1, S4 and S6 to account for the incidence angle effect. Radar backscatter of samples taken at known sites was analyzed. The forest backscatter signal shows temporal stability during summer and winter, either with leaf-on or leaf-off trees. On the contrary, backscattering from forest is strongly enhanced by underlying water. Radar returns were found to change from an attenuated signal to one dominated by double-bounce behaviour. In wetlands dominated by rushes, the dominant interaction mechanism may change from double-bounce to specular reflection due to flood. During normal water-level conditions, the ability to differentiate forest from herbaceous vegetation was found to decrease with increasing incidence angle. Under extreme flooding, radar backscattering decreases from steep to shallow incidence angles, about 3 dB for forest, and 4 dB for rushes.
format	JOUR
author	Kandus, P. Karszenbaum, H. Pultz, T. Parmuchi, G. Bava, J.
author_facet	Kandus, P. Karszenbaum, H. Pultz, T. Parmuchi, G. Bava, J.
author_sort	Kandus, P.
title	Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
title_short	Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
title_full	Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
title_fullStr	Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
title_full_unstemmed	Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
title_sort	influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems
url	http://hdl.handle.net/20.500.12110/paper_07038992_v27_n6_p651_Kandus
work_keys_str_mv	AT kandusp influenceoffloodconditionsandvegetationstatusontheradarbackscatterofwetlandecosystems AT karszenbaumh influenceoffloodconditionsandvegetationstatusontheradarbackscatterofwetlandecosystems AT pultzt influenceoffloodconditionsandvegetationstatusontheradarbackscatterofwetlandecosystems AT parmuchig influenceoffloodconditionsandvegetationstatusontheradarbackscatterofwetlandecosystems AT bavaj influenceoffloodconditionsandvegetationstatusontheradarbackscatterofwetlandecosystems
_version_	1807324071357054976

Influence of flood conditions and vegetation status on the radar backscatter of wetland ecosystems

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