What is the National Hydrography dataset?
The National Hydrography Dataset (NHD) represents the water drainage network of the United States with features such as rivers, streams, canals, lakes, ponds, coastline, dams, and streamgages. The NHD is the most up-to-date and comprehensive hydrography dataset for the Nation.
Where can I download NHD?
To download data, please visit https://www.usgs.gov/core-science-systems/ngp/national-hydrography/access-national-hydrography-products.
What is NHD waterbody?
Description: Abstract: The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation’s surface water drainage system.
What’s the definition of hydrography?
Hydrography is the science that measures and describes the physical features of the navigable portion of the Earth’s surface and adjoining coastal areas. Hydrographic surveyors study these bodies of water to see what the “floor” looks like.
What is hydrography map?
A hydrographic survey map is a type of topographic map, which is used to reveal the slopes and contours of land. Hydrographic maps are specially made to survey underwater land terrain. Such maps can be used to help in investigations, oceanography studies and naval services.
What is linear hydrography?
Linear Hydrography contains linear water features (streams, rivers, etc. ): “The Linear Hydrography National Geodatabase contains all linear hydrography (rivers, streams, etc.) for the nation.
What is a USGS blue line stream?
Blue line stream means a stream that appears as a broken or solid blue line (or a purple line) on a United States Geological Service (USGS) topographical map. Sample 1. Sample 2. Blue line stream means creeks or streams which are indicated on the USGS quadrants of which Butler County is contained.
What is a blueline Creek?
(a) Definition: Blueline creek: A creek, stream or watercourse indicated by a solid or broken blue line on a U.S. Geologic Survey 7.5 minute series quadrangle map.
What is the National Hydrography Dataset (nHD)?
What is the National Hydrography Dataset (NHD)? What is the National Hydrography Dataset (NHD)? The National Hydrography Dataset (NHD) is a digital vector dataset used by Geographic Information Systems (GIS) to define the spatial locations of surface waters and is designed to provide comprehensive coverage of surface water data for the U.S.
What data is included in the NHD?
The NHD is available as a file geodatabase download, which maintains the richness of the complex NHD database model, including multiple feature datasets, feature classes, event feature classes, attribute tables, relationship classes, domains, and feature-level metadata.
What is the National Elevation Dataset?
Greatly improved 30 meter National Elevation Dataset (NED). Nationally complete Watershed Boundary Dataset (WBD). A set of value added attributes to enhance stream network navigation, analysis and display. An elevation-based catchment for each flowline in the stream network. Catchment characteristics. Headwater node areas.
How do we communicate with the National Hydrography database?
We communicate monthly through the NHD Newsletters and Hydrography Advisory Calls, and hold special seminars and workshops as well. Please visit the National Hydrography Dataset Playlist on the USGS YouTube Channel for recorded Advisory Calls and the News tab on the left for more detailed information. For questions, please email [email protected].