National Wetlands Inventory of the United States and Territories

Published by TWRA_GIS

<p><strong>Overview</strong></p><p>This Feature Service provides comprehensive geospatial data on the extent, approximate location, and types of wetlands and deepwater habitats across the United States and its Territories. The data represent wetlands and surface waters as defined by Cowardin et al. (1979) and incorporate both polygonal and linear wetland features, supplemented with hydrography from the U.S. Geological Survey's National Hydrography Dataset.</p><p><strong>Feature Layer</strong></p><ul><li><strong>National Wetlands Inventory</strong>: This layer delineates wetland and deepwater habitats including various wetland types and surface waters. It includes updated mapping, especially for states like Washington, Oregon, California, Nevada, and Idaho from 2012 onward, capturing all surface water features rather than derived data. The dataset excludes certain habitats like submerged aquatic vegetation in estuarine and coastal waters, some deepwater reef communities, and particular types of farmed wetlands as defined by policy. For detailed mapping procedures and metadata, this layer is intended to be used alongside the Wetlands_Project_Metadata dataset.</li></ul><p><strong>Geographic Coverage</strong></p><p>The dataset covers wetlands and deepwater habitats throughout the United States and its Territories, providing valuable insights into national aquatic and wetland resources.</p><p><strong>Use Cases</strong></p><ul><li>Environmental resource management and conservation planning.</li><li>Wetland protection and regulatory compliance analyses.</li><li>Hydrological and ecological research.</li><li>Supporting habitat restoration and monitoring efforts.</li><li>Informing land use planning and development impact assessments.</li></ul><p><strong>Access and Data Quality</strong></p><p>The data were compiled from aerial imagery and supplemented with authoritative hydrography datasets. Certain limitations apply due to the nature of data acquisition, notably the exclusion of some submerged and deepwater habitats. Updated mapping efforts enhance the currency and accuracy of the dataset where newer surveys have been conducted. Data are sourced from: https://geodata.tn.gov/datasets/b02ce30ef95b45c8a50f19f54b40ab5e_0/about</p>