Towards operational monitoring of a northern wetland using geomatics-based techniques

Töyrä, Jessika; Pietroniro, Alain

doi:10.1016/j.rse.2005.03.012

Cited by 158 publications

(71 citation statements)

References 28 publications

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“…These are often limitations for optical/infrared satellite sensors. SAR systems also can penetrate vegetation canopies, to varying degrees, to image understory conditions [40]. Additionally, the water-saturated nature of wetlands tends to render them highly reflective of SAR transmitted energy.…”

Section: Introductionmentioning

confidence: 99%

“…Smooth surfaces can appear brighter than rough surfaces at small incidence angles (usually less than 20-25 degrees), but rough surfaces remain largely unaffected by incidence angle. Lower incidence angles tend to be more sensitive to waves on water, therefore a combination of high and low incidence angle images are sometimes needed to accurately map water [40]. Smaller incidence angles are better able to penetrate vegetation, and thus can better detect flooded vegetation [41−43].…”

Section: Introductionmentioning

confidence: 99%

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A Collection of SAR Methodologies for Monitoring Wetlands

et al. 2015

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Abstract:Wetlands are an important natural resource that requires monitoring. A key step in environmental monitoring is to map the locations and characteristics of the resource to better enable assessment of change over time. Synthetic Aperture Radar (SAR) systems are helpful in this way for wetland resources because their data can be used to map and monitor changes in surface water extent, saturated soils, flooded vegetation, and changes in wetland vegetation cover. We review a few techniques to demonstrate SAR capabilities for wetland monitoring, including the commonly used method of grey-level thresholding for mapping surface water and highlighting changes in extent, and approaches for polarimetric decompositions to map flooded vegetation and changes from one class of land cover to another. We use the Curvelet-based change detection and the Wishart-Chernoff Distance approaches to show how they substantially improve mapping of flooded vegetation and flagging areas of change, respectively. We recommend that the increasing availability SAR data and the proven ability of these data to map various components of wetlands mean SAR should be considered as a critical component of a wetland monitoring system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Collection of SAR Methodologies for Monitoring Wetlands

et al. 2015

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“…Water monitoring using Synthetic Aperture Radar (SAR) has been the object of study for many researchers [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Due to its all-weather capabilities, and its image acquisition capacity during day or night or in cloudy conditions, SAR imagery offers better alternatives for water mapping than optical imagery [5].…”

Section: Introductionmentioning

confidence: 99%

Operational Surface Water Detection and Monitoring Using Radarsat 2

et al. 2016

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Traditional on-site methods for mapping and monitoring surface water extent are prohibitively expensive at a national scale within Canada. Despite successful cost-sharing programs between the provinces and the federal government, an extensive number of water features within the country remain unmonitored. Particularly difficult to monitor are the potholes in the Canadian Prairie region, most of which are ephemeral in nature and represent a discontinuous flow that influences water pathways, runoff response, flooding and local weather. Radarsat-2 and the Radarsat Constellation Mission (RCM) offer unique capabilities to map the extent of water bodies at a national scale, including unmonitored sites, and leverage the current infrastructure of the Meteorological Service of Canada to monitor water information in remote regions. An analysis of the technical requirements of the Radarsat-2 beam mode, polarization and resolution is presented. A threshold-based procedure to map locations of non-vegetated water bodies after the ice break-up is used and complemented with a texture-based indicator to capture the most homogeneous water areas and automatically delineate their extents. Some strategies to cope with the radiometric artifacts of noise inherent to Synthetic Aperture Radar (SAR) images are also discussed. Our results show that Radarsat-2 Fine mode can capture 88% of the total water area in a fully automated way. This will greatly improve current operational procedures for surface water monitoring information and impact a number of applications including weather forecasting, hydrological modeling, and drought/flood predictions.

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“…The ecology of the delta, which is recognized as a United Nations world heritage site because of its high biological diversity, is dependent on regular inundation through overbank flooding (Töyrä and Pietroniro, 2005). Prior to 1996, no significant flooding had occurred for a period of 22 years due to a combination of flow regulation and climatic variability .…”

Section: Results a P-e And Discharge For 1995-98mentioning

confidence: 99%