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.
EPA WATERS Service
Draw a Polygon
Find Feature From ScienceBase