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NOTE: This initial screening does not replace an on-site delineation to determine whether <br />wetlands occur. Additional information on the NWI data is provided below. <br />Data limitations <br />The Service's objective of mapping wetlands and deepwater habitats is to produce reconnaissance level <br />information on the location, type and size of these resources. The maps are prepared from the analysis of <br />high altitude imagery. Wetlands are identied based on vegetation, visible hydrology and geography. A <br />margin of error is inherent in the use of imagery; thus, detailed on-the-ground inspection of any particular <br />site may result in revision of the wetland boundaries or classication established through image analysis. <br />The accuracy of image interpretation depends on the quality of the imagery, the experience of the image <br />analysts, the amount and quality of the collateral data and the amount of ground truth verication work <br />conducted. Metadata should be consulted to determine the date of the source imagery used and any <br />mapping problems. <br />PUBFh <br />PUSA <br />PUBG <br />PABF <br />PUBGh <br />PUBFx <br />PABFh <br />PUSAh <br />PUSCh <br />PABG <br />RIVERINE <br />R3UBH <br />R3USC <br />R4SBJ <br />R4SBA <br />R4SBCx <br />R4SBC <br />R3USA <br />R4SBAx <br />R3UBG <br />R3UBHx <br />R3UBF <br />R3USCr <br />A full description for each wetland code can be found at the National Wetlands Inventory <br />website