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In large river ecosystems, the timing, extent, duration and frequency of floodplain inundation greatly affect the quality of fish and wildlife habitat and the supply of important ecosystem goods and services. Seasonal high flows provide connectivity from the river to the floodplain, and seasonal inundation of the floodplain governs ecosystem structure and function. River regulation and other forms of hydrologic alteration have altered the connectivity of many rivers with their adjacent floodplain – impacting the function of wetlands on the floodplain and in turn, impacting the mainstem river function. Conservation and management of remaining floodplain resources can be improved through a better understanding of...
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NARWidth v.0.1 contains 6.7 million georeferenced measurements of river width at mean discharge >=30 m and an additional 1.3 million flagged width measurements of reservoirs and lakes that are connected to the fluvial network. The data set includes measurements of rivers above 60°N, where high-quality river centerline and width data are largely unavailable, but excludes very large lakes (e.g., the Great Lakes), ephemeral streams, deltaic systems, and human-made canals. Additionally, NARWidth includes a braiding index field, defined as the number of channels at each river cross section. The braiding index only includes river channels wider than 30 m, a limitation imposed by the spatial resolution of Landsat imagery....
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Data set includes a mosaic of multiple Landsat 8 OLI sensor path/row combinations for May 14, 17, and 19, 2014 covering the South Atlantic Landscape Conservation Cooperative (SALCC) geography between extreme northeastern North Carolina (including Back Bay, VA-NC) south through Sapelo I., GA. The imagery was acquired as georeferenced, calibrated digital data. Water and upland masking used NIR thresholds, CCAP land cover, and LiDAR DEMs. The image composite includes three normalized difference indces useful for marsh classification and monitoring, including: 1) Normalized Difference Vegetation Index (NDVI), 2) Normalized Difference Water Index (NDSI), and 3) Normalied Difference Soil Index (NDSI). The NDX bands were...
    map background search result map search result map North American River Width Data Set (NARWidth v.0.1) GCPO Inundation Frequency Mosaic (2017) Normalized Difference Index (NDX) Mosaic Composite for Salt Marshes Normalized Difference Index (NDX) Mosaic Composite for Salt Marshes GCPO Inundation Frequency Mosaic (2017) North American River Width Data Set (NARWidth v.0.1)