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Elevation-Derived Hydrography READ Rules: Guidelines

By NGP Standards and Specifications

These are official USGS guidelines and supplement published specifications. Please see the Elevation-Derived Hydrography Specifications website for more information. Official published specifications may supersede these guidelines in the future. 

Elevation-Derived Hydrography Specifications
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Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Alaska and CONUS* Elevation-Derived Hydrography Network Connectivity through Ice Masses (version 1)

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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)

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Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Alaska and CONUS Elevation-Derived Hydrography Stream River Special Condition: Complex Interlacing Channels (version 3)

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Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Alaska and CONUS* Elevation-Derived Hydrography for Sea/Ocean (version 3)

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Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Alaska and CONUS* Elevation-Derived Hydrography Connector through Infrastructure Areas (version 2)

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Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Alaska and CONUS* Elevation-Derived Hydrography X, Y, and Z Coordinate Precision (version 5)

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Guideline for Hydrography Acquisition Representation, Extraction, Attribution, and Delineation Rules Update for Elevation-Derived Hydrography Inclusion or Omission of NHD Waterbody Features (version 2)