NHDPlus High Resolution
The NHDPlus High Resolution (NHDPlus HR) is a scalable geospatial hydrography framework built from the high resolution National Hydrography Dataset, nationally complete Watershed Boundary Dataset, and ⅓ arc-second (10 meter ground spacing) 3D Elevation Program data. The NHDPlus HR brings modeling and assessment down to a local, neighborhood level, while nesting seamlessly into the national context.
NHDPlus HR is modeled after the highly successful NHDPlus Version 2. Like the NHDPlus version 2, the NHDPlus HR is comprised of a nationally seamless network of stream reaches, elevation-based catchment areas, flow surfaces, and value-added attributes that enhance stream network navigation, analysis, and data display. However, users will find that the NHDPlus HR, which increases the number of features nationally from about three million in the NHDPlus Version 2 to over 30 million, provides richer, more current content that also can be used at a variety of scales.
The NHDPlus HR framework extends the hydrologic network seamlessly across the terrain by including not only streams, but also associated catchment areas that drain to each stream segment. This association allows information about the landscape to be related to the stream network. Observational data on the stream network, such as water quality samples, streamgage measurements, or fish distribution, can also be linked to the framework. Together, the framework and linked data can support a limitless range and type of applications, for example:
When completed, the NHDPlus HR will provide a common geospatial framework that is open and accessible for use by everyone, including government, citizens, and industry. It will be the geospatial framework supporting the Open Water Data Initiative, which seeks to integrate currently fragmented water information into a connected national water data infrastructure to underpin innovation, modeling, data sharing, and solution development. NHDPlus HR will not only provide far more detail than NHDPlus V2 in order to support local analysis and modeling, special attributes also allow the selection of more generalized stream networks for regional or national analysis, while retaining the spatial accuracy of the highest-resolution, nationally available datasets.
What are the components of NHDPlus HR?
The NHDPlus HR is built using:
NHDPlus HR consists of vector and raster data layers. It includes a snapshot of the NHD and WBD at the time the NHDPlus HR was built, as well as the following components:
A poster of the NHDPlus Data Model v1.0 is available with details on dataset structure, feature classes, domains, and relationships.
What is NHDPlus HR Beta?
Large geospatial datasets sometimes contain errors due to processing, input errors, or other issues, particularly when they are first created. To ensure data quality, the NHDPlus HR is being created in an iterative fashion starting with production of a “Beta” version. While in Beta, the data will undergo a structured review by volunteers in the user community, during which errors in the component hydrography datasets (NHD and WBD) will be identified and corrected. The data will then be “refreshed” using the updated component datasets to create an improved product. This period of user review is a vital part of the overall process. Please see the section below on helping with the NHDPlus HR for more information on how to get involved.
How do I access NHDPlus HR?
Note that two download files are available for each area: a file geodatabase (GDB) of all vector datasets in compressed ZIP format, and a collection of raster files in 7-Zip compressed format. An NHDPlus HR User Guide for more information on what is contained in these download files is under development and will be available soon.
Where is NHDPlus HR available?
The map to the right provides a general overview of the NHDPlus HR Beta production process.
Below is the general processing order for creating the Beta version of the NHDPlus HR. It is subject to change based on data readiness and program prioritization.
Approximate Scale Representation using the VisibilityFilter Attribute
Please note: The VisibilityFeature attribute currently is only available for NHDPlus HR Regions 1 and 6. After a period of testing, it will be included in all NHD and NHDPlus HR data as datasets are produced.
The VisibilityFilter attribute enables users to represent NHD vector features in the NHDPlus HR at eight different map scales. Using an algorithm, each feature is assigned a VisibilityFilter value, indicating the approximate appropriate map scale, and all larger scales, for representing the features. This attribute is available for the NHDFlowline, NHDWaterbody, NHDArea, and NHDLine feature classes. Details on methods for using the VisbilityFilter attribute, information on known issues, and citations for determining the map scale levels are available on the Scale Representation using the VisibilityFilter Attribute page.
How can I help with NHDPlus HR?
Improving the NHD and WBD prior to NHDPlus HR Production: Partners proficient with NHD or WBD editing tools can perform the required review/quality control (QC) and fix problems in the NHD and WBD data before the datasets are used in NHDPlus HR production. Partners who have local knowledge but are not trained editors can get involved in the review/QC effort following the release of the web-based markup application later in 2017. Areas are not available for editing during the NHDPlus HR build process. Please visit the section above on data availability to see areas available for editing. Please contact the NHD Point of Contact in your area for questions about NHD and WBD editing.
NHDPlus HR Beta review/QC: The USGS is seeking volunteers to perform a review/QC of the NHDPlus HR Beta in various Hydrologic Regions. This opportunity is ideal for users with previous NHDPlus Version 2 (medium resolution) experience and, most importantly, local hydrography knowledge. Please contact email@example.com directly to participate in the NHDPlus HR Beta review/QC process.
How can I learn more about NHDPlus HR?
A poster of the NHDPlus Data Model v1.0 is available with details on dataset structure, feature classes, domains, and relationships. An NHDPlus HR User Guide for more information on what is contained in these download files is under development and will be available soon.
Errors in the NHDPlus HR Beta Dataset
How do I report errors in NHDPlus HR?
If you discover an error in the NHDPlus HR stream network or waterbodies, please report the issue via web form. In the future, we will have a web-based markup application that will provide an easier and more robust method for reporting errors.
Known errors in the NHDPlus HR Beta Datasets
Below are issues identified in the NHDPlus HR Beta datasets which do not need further reporting.
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