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Webinar: Wetland Mapping Consortium
February 19, 2014 @ 11:00 am - 12:00 pm
Hosted by the Association of State Wetland Managers
Mapping Forested Wetland Inundation with the Landsat Historic Record –Megan Lang, Senior Research Scientist with Science Systems and Applications, Inc. and Coordinator of the U.S. Department of Agriculture Mid-Atlantic Wetland Conservation Effects Assessment Project
Abstract: Wetland areas in the Mid-Atlantic region are inundated or saturated for a relatively short period, usually in the spring after snowmelt and before leaf-out so monitoring the hydrologic condition of wetlands can be difficult. Remote sensing provides a major data source for monitoring wetland dynamics. The purpose of this study was to develop a new approach to map wetland inundation using combined data from LiDAR (Light Detection and Ranging) and Landsat time series data. The results demonstrate that accurate maps of wetland inundation can be developed using this approach and that Landsat images can be calibrated to reveal the inundation state of wetlands over large regions. The importance of this finding is linked to the 40+ year continuous record of Landsat images, which can now be used to look at long-term trends in wetland hydrology. This will enhance our ability to detect influences of climate and land use change on wetland ecosystems and the health of the Chesapeake Bay.
Mapping the Relationship between Inundation and Stream Flow using Landsat Time Series Data– In-Young Yeo, Assistant Professor of Geographical Sciences, University of Maryland
Abstract: While it is known that wetland hydrology is affected by the climate, the relationship among wetland inundation extent, weather variability, and downstream hydrology has rarely been assessed at the landscape scale. We report findings from time series satellite observations that illustrate changes in wetland inundation in depressional palustrine forested wetlands located in the Coastal Plain of the Chesapeake Bay Watershed at a high spatial resolution (30 m) over the period 1985-2010. Mapping results demonstrate that extent of wetland inundation is highly variable. Inundation extent changes in response to weather variability, and it was proportionally related to the downstream flow discharge, but this relationship varies according to NWI wetland hydrologic modifiers. This study demonstrates that inundation patterns of headwater wetlands that are often considered to be geographically isolated are strongly related to stream discharge, thus supporting the conclusion that all wetlands and streams are closely linked at the watershed scale within the Maryland Coastal Plain.