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Appendix A: Feature Class Details <br />Table A-1. Hydrography Class <br />Attribute Descri tion T e <br /> The common identifier. 10-digit integer value that uniquely identifies <br /> the occurrence of each feature and reach. Each value occurs only <br /> once throughout the NHD. Once assigned, the identifier is associated <br />ComID permanently with its feature or reach and should not be altered. esriFieldTypeInteger <br /> When a feature or reach is deleted, its identifier is retired. It is used <br /> to communicate and share corrections and updates among <br /> organizations. <br />FDate Date of last feature modification. esriFieldTypeDate <br /> Source data resolution. Code linked to a description of the source <br />Resolution scale: 3=medium (1:100,000), 2=high (1:24,000), and 1=local esriFieldTypeInteger <br /> (typically 1:5,000). <br /> Identifier that maintains the link to the Geographic Names <br /> Information System (GNIS) name of the reach. <br /> The GNIS is developed by the USGS and contains information about <br /> almost 2 million physical and cultural geographic features in the <br />GNIS_ID United States. It is the Nation's official repository of domestic esriFieldTypeString <br /> geographic names information. A "blank" means that the name is not <br /> populated (it is not clear from NHD documentation whether this <br /> means that the feature does not have a corresponding record in the <br /> GNIS database or that a matchin effort has not occurred). <br /> Geographic name -the proper name, specific term, or expression by <br /> which a particular geographic entity is known. A "blank" means that <br /> the name is not populated (it is not clear from NHD documentation <br />GNIS Name <br />whether this means that the feature does not have a corresponding esriFieldTypeString <br /> record in the GNIS database or that a matching effort has not <br /> occurred). <br />Page 14 Of 17 ~~ilversFd'e Technology, Inc. <br />4M1'xerov Reseurrc.s E piper.: mg and Cunse~Rrnq <br />