SEASAT synthetic aperture radar (SAR) response to lowland vegetation types in eastern Maryland and Virginia

Krohn, M. Dennis; Milton, N. M.; Segal, Donald B.

doi:10.1029/jc088ic03p01937

Cited by 38 publications

(10 citation statements)

References 10 publications

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“…Mangroves are, however, inundated regularly and as the underlying surface (whether soil or water) is smooth, specular scattering often dominates. In such cases, specularly reflected incident microwaves travelling at right angles (orthogonal) between tree trunks, for example, and the ground can interact and produce a strong doublebounce effect (MacDonald, 1980;Krohn et al, 1983;Ormsby et al, 1985;Imhoff, 1995a;Simard et al, 2002), which often increases the backscattering coefficient beyond the normal level of saturation (Mougin et al, 1999;Proisy et al, 2002). However, specular reflection depends on the architecture of the trees as well as the roughness of the underlying surface and is not observed in all mangroves.…”

Section: Sar Remote Sensing Of Mangroves: An Overviewmentioning

confidence: 94%

The potential of L‐band SAR for quantifying mangrove characteristics and change: case studies from the tropics

Lucas¹,

Mitchell²,

Rosenqvist³

et al. 2007

Aquatic Conservation

135

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Lucas, R. M., Mitchell, A. L., Rosenqvist, A., Christophe, P., Melius, A., Ticehurst, C. (2007). The potential of L-band SAR for quantifying mangrove characteristics and change: case studies from the tropics. Aquatic Conservation-Marine and Freshwater Ecosystems, 17, 245-264. Sponsorship: Environmental Research Institute of the Supervising Scientist (ERISS)1. The Japan Aerospace Exploration Agency's (JAXA) Advanced Land Observing Satellite (ALOS) L-band Phased Array Synthetic Aperture Radar (PALSAR), launched successfully in January 2006, will provide new data sets for coastal ecosystems mapping and change monitoring at local to global scales. 2. To evaluate L-band capability for mangrove applications, data acquired by the NASA airborne SAR (AIRSAR) and Japanese Earth Resources Satellite (JERS-1 SAR) over sites in Australia, French Guiana and Malaysia were used to demonstrate benefits for mapping extent and zones, retrieving biomass and structural attributes (e.g. height), and detecting change. 3. The research indicates that mapping is most effective where mangroves border non-forested areas and where differences in structure, as a function of species, growth stage and biomass distributions, occur between zones. 4. Using L-band SAR, biomass can be retrieved up to ?100?140 Mg ha?1, although retrieval is complicated by a noticeable decrease in L-band backscattering coefficient within higher (?>200 Mg ha?1) biomass stands, particularly those with extensive prop root systems. 5. Change detection through multi-temporal comparison of data proved useful for mapping deforestation/regeneration and mangrove dynamics associated with changing patterns of sedimentation. 6. The research highlights the likely benefits and limitations of using ALOS PALSAR data and supports JAXA's Kyoto & Carbon (K&C) Initiative in promoting the use of these data for regional mangrove assessment.Peer reviewe

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Section: Sar Remote Sensing Of Mangroves: An Overviewmentioning

confidence: 94%

The potential of L‐band SAR for quantifying mangrove characteristics and change: case studies from the tropics

Lucas¹,

Mitchell²,

Rosenqvist³

et al. 2007

Aquatic Conservation

135

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“…SAR, on the other hand, is known to be sensitive to ooded vegetation, as observed already 20 years ago in both SEASAT and Shuttle Imaging Radar-A (SIR-A) data (MacDonald et al 1980, Krohn et al 1983, Ormsby et al 1985. L-band (23.5 cm) or longer wavelength microwave signals penetrate the forest canopy and Figure 2.…”

Section: Site Characteristicsmentioning

confidence: 95%

The use of spaceborne radar data to model inundation patterns and trace gas emissions in the central Amazon floodplain

Rosenqvist¹,

Forsberg²,

Pimentel³

et al. 2002

International Journal of Remote Sensing

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River oodplains are the dominant wetland habitat in the Amazon river basin, providing important habitation for aquatic ora and fauna, and playing a key role in sustaining regional sh production. The annual inundation pulse has been identi ed as the dominant environmental factor aVecting aquatic biota on the oodplain, and the characteristics of this pulse, in terms of timing, duration and amplitude, vary spatially on the oodplain as a function of uctuations in river stage height and topography. River oodplains are furthermore globally signi cant sources of methane (CH 4 ) and other trace gases essential to climate regulation. Re ned information on wetland distributions and dynamics are currently needed to improve estimates of habitat availability and to calculate regional contributions of trace gases, especially CH 4 , to the troposphere. This paper describes how multitemporal time series of spaceborne L-band Synthetic Aperture Radar (SAR) data from the Japanese Earth Resource Satellite 1 (JERS-1) were used to generate a model of the spatial and temporal variation of inundation on the oodplain of a typical black water river in the Central Brazilian Amazon and how this model was utilized, together with in situ measurements of river stage heights and CH 4 uxes, to model regional estimates of CH 4 emissions. We also demonstrate how a JERS-1 SAR time series can be used to map the spatial variation of ood duration on the oodplain, a key factor controlling local variations in plant biodiversity.For both applications, the availability of adequate time series of satellite sensor data is the prime factor aVecting the reliability and accuracy of the ood models and the spatial details of the ood duration map. The availability of in situ data, especially daily river height measurements, was also critical for the development of the ooding model and for the subsequent decoupling of the model from the satellite sensor data.

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“…As the leaves of the trees generally are too small to be detected, L-band signals penetrate deeper into the canopy to interact with the branches, as well as to provide information about the stems and the underlying ground surface. This property makes L-band SAR particularly significant in the wetland context, for distinction between flooded and non-flooded forest (Krohn et al, 1983;Hess et al, 1995). L-band has also proved useful for mapping of irrigated rice (Rosenqvist, 1999).…”

Section: Synthetic Aperture Radarmentioning

confidence: 98%

The potential of long‐wavelength satellite‐borne radar to support implementation of the Ramsar Wetlands Convention

Rosenqvist

Finlayson

Lowry³

et al. 2007

Aquatic Conservation

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ABSTRACT1. This paper provides an introduction to Synthetic Aperture Radar (SAR) remote sensing and, in particular, the significance of long-wavelength (L-band) SAR for wetland applications relevant to the Ramsar Wetlands Convention.2. The Convention has long been a supporter of effective wetland inventory being used to support management initiatives and the wise use of all wetlands.3. Three major application areas have been identified where SAR data may constitute an important additional information source for wetland inventory and management. These comprise mapping of below-canopy inundation, monitoring of environmental disturbances and wetland inventories based on SAR mosaics. These areas have all previously been supported in general terms by formal resolutions on wetland inventory and assessment through the Convention with recognition that further technique development was required.4. The potential to make further use of remote sensing is increased through wider use of the special features of SAR in situations where other data are less suitable.5. The Japanese Advanced Land Observing Satellite (ALOS) provides an opportunity to support the Convention and its goal of wise use of all wetlands.

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SEASAT synthetic aperture radar (SAR) response to lowland vegetation types in eastern Maryland and Virginia

Cited by 38 publications

References 10 publications

The potential of L‐band SAR for quantifying mangrove characteristics and change: case studies from the tropics

The potential of L‐band SAR for quantifying mangrove characteristics and change: case studies from the tropics

The use of spaceborne radar data to model inundation patterns and trace gas emissions in the central Amazon floodplain

The potential of long‐wavelength satellite‐borne radar to support implementation of the Ramsar Wetlands Convention

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