Elevation-derived hydrography—Representation, extraction, attribution, and delineation rules

With the increasing availability of 3D Elevation Program (3DEP) quality high resolution elevation data across the United States and the pressing need for better integrated elevation and hydrography data, the U.S. Geological Survey is developing guidance to improve the horizontal and vertical alignment of these datasets. The U.S. Geological Survey is providing the Elevation-Derived Hydrography—Acquisition Specifications for the acquisition of elevation-derived hydrography for the United States, and the companion document The Elevation-Derived Hydrography—Representation, Extraction, Attribution, and Delineation (READ) Rules, which describes the parameters for the portrayal of hydrography features as derived from elevation data. The READ Rules provide a definition, example, attribute value list, delineation instructions, representation rules, and data extraction rules for each hydrography feature required to meet the Elevation-Derived Hydrography—Acquisition Specifications.