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- NHDinARC QuickStart HTML 17k | PDF 145k
The "NHDinARC QuickStart" is a condensed and highly informative reference document for the NHDinARC data model. The document defines important components of the data model, while addressing basic questions about the dataset.
- Concepts and Contents HTML 597k | PDF 739k
"Concepts and Contents" is the primary reference document for the National Hydrography Dataset. In this document, one will find information ranging from a high level overview of the NHD to detailed descriptions of the NHD data content. The "Concepts and Contents" document describes the elements of the dataset that make the NHD an effective resource to new users as well as those who have been using the USGS Digital Line Graph and the EPA Reach File. The main points of this document are summarized in the "NHDinARC QuickStart" document.
- Introducing the NHDinARC HTML 150k | PDF 289k
"Introducing the NHDinARC" is a document that describes a common distribution format for the National Hydrography Dataset known as the NHDinARC format. Among the topics discussed within this document are a description of the NHDinARC data model and ARC/INFO elements used within the NHDinARC. The NHDinARC Schema, below, is a companion graphic to the "Introducing the NHDinARC".
- NHDinARC Schema - Diagram of the tables, the table items, the item definitions, and the relationships between the tables in the NHDinARC data model.
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- NHDinGEO Schema - Diagram of the tables, the table items, the item definitions, and the relationships between the tables in the NHDinGEO data model.
- NHD Data Standards
- Defines valid feature types and their characteristics, the delineation or extent of a feature, how a feature is stored in the data, and detailed capture conditions for each of the feature types in the National Hydrography Dataset (NHD).
- NHD Fact Sheet - A brief summary of the history and characteristics of the NHD, with additional information concerning obtaining, and maintaining the NHD.
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