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National Wetland Inventory Maps are produced by the U.S. Fish and Wildlife Senrice, a sub^partment <br />of the U.S. Department of the Interior. In 1974. the U.S. Fish and Wildlife Service developed a criteria ter <br />wetland dasiificatlon with tour long range objectives; <br />to describe ecological units that have certain homogeneous natural attributes, <br />to anaiige these units in a system that will aid decisions about resource management, <br />to furnish units for inventory and mapping, and <br />to provida uniformity <n concepts and terminology throughout the U.S. <br />High dtitude infrared photographs. so« maps, topographic maps and site visits are the methods <br />used to gather data for the productions of these maps. In the infrared photos, wetlands appear as <br />different colors and these wetlands are then daulfied by type. Using a hierarchical dasslfication. <br />the maps Identify weHand and deepwater habitats accordfog to: <br />systom <br />subeystem <br />class <br />subclass <br />moddiers <br />(as defined by Cowardin, et ai. U.S. Fish and Wildlife Service FWS/OBS 79/31.1979.) <br />The dassification system consists of five systems; <br />t. marine <br />2. estuarine <br />3. riverine <br />4. taoBtrine <br />5. pahistrine <br />The marine system consists of deep water tidal habitato and adjacent tidal wedartds. Tha riverine <br />system consistB of all wetlands oontainedwffhin a channel Thelacusirine systems incfodre aH <br />nonWal wettends relsted to swamps, bogs & marshes. The estuarirte system consists or <br />deepwater tidsi habitats and where ocean water is diluted by fresh water. The palustrine system <br />indudss nontidal wetlands dominated by trees and shrubs and where saBnIty is below .5% in tidal <br />areas. All of these systems are divided in subsystems and then forther dividad into class. <br />Natiorwl Wetland Inventory Maps are produced by transferring gathered data on a standard 7.5 <br />minute U.S.G.S. topographic map. Approximately 52 square miles are covered on a National <br />Wetland Inventory map at a scale of 1 -.24.000. Electronic data Is compiled by digitiang these <br />National Wetland inventory Maps. <br />TC01l07443lr Page 20 3133