U.S. Geological Survey

This services uses the EPA Waters web service to retrieve a watershed polygon from the NHD+ dataset above the point selected on the map. Give your waters analysis shape a unique name and select a point near the outlet of the watershed you want to define. The Waters web service will be queried and the data will be loaded as a web feature service for analysis and a web map service for visualization. The name you give will appear in the feature types list as waters:name. If you click a new point with the waters shape name set to the name of an existing waters feature type, the existing one will be overwritten. Note that the NHD+ hydrography is not accurate in all places so use this service cautiously.

Select a zipped file containing (at a minimum) the .shp, .shx, .prj, and .dbf components of your shapefile. There is more information about uploading shapefiles at the Geo Data Portal FAQ.

Select to draw your area of interest. Click on the map to specify each vertex of a polygon. On the last vertex, double click to finish the polygon. Give it a name and click the submit button to save the geometry and select it for processing.

Through collaboration with ScienceBase, the Geo Data Portal is able to access features exposed on the Science Base server.