Generate a hydrologic linear reference for point data representing locations of geographic features or field samples using the HydroLink Tool. This web-based GIS application allows for upload of a shapefile, CSV, or Excel file for easy linkage of spatial data records to the National Hydrography Dataset (NHD) Plus Medium Resolution and NHD High Resolution hydrology layers. The outputted value-added dataset can be associated with NHD parameters and other data linked to the NHD.
The application accesses, and modifies feature services stored in your USGS ArcGIS Online account. Use the "Login" button below to sign into the HydroLink Tool using your ArcGIS Online credentials or "Request ArcGIS Online Account (USGS only)" if one is needed.
GETTING STARTED - The HydroLink Tool aids in generating a linear reference for point data to the NHDPlusV2.1 Medium Resolution and NHD High Resolution hydrography layers. The tool employs the researcher’s local, field-based knowledge of the geospatial features where data were collected to improve both the spatial accuracy of the research data and assist in the linkage to these national surface water datasets.
Once the point location data are verified and linear referencing is complete, the output dataset includes the verified latitude and longitude coordinates and additional attributes to document the linkage to the hydrography datasets. The dataset can then be exported as a shapefile (SHP) from the tool, exported in multiple formats through ArcGIS Online [e.g. comma separated values (CSV), file geodatabase (FGDB), and GeoJSON], or published as a web service (e.g. map services with WMS enabled).
MY ARCGIS ONLINE FEATURE SERVICES - HydroLink only functions using correctly formatted Feature Services. Clicking “Add Shapefile” will automatically create a feature service in your ArcGIS Online account with the correct data structure to work against. Below is a list of all feature services in your personal ArcGIS Online account. Click the "Edit" button to begin editing a dataset, click the "View" button to view your dataset in ArcGIS Online, or click the “Export” button to download your final data in shapefile format.
|Add shapefile to your ArcGIS Online account. Shapefiles must be zipped before they can be uploaded.|
|Add a comma seperated values (CSV) file or Microsoft Excel file to your ArcGIS Online account.|
|Click "Locate" and then click a reach on the map.|