Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Alaska and CONUS* Elevation-Derived Hydrography Vertical Integration of Linear Features Through Depressions (version 4)

These are official USGS guidelines and supplement published specifications concerning Elevation-Derived Hydrography Vertical Integration of Linear Features through Depressions. Please see the Elevation Derived Hydrography Specifications website for more information. Official published specifications may supersede these guidelines in the future.