The Rivers & Streams Download command allows the user to download the National Hydrograph Dataset (NHD) from the USGS web map service as shapefile data, showing river and stream data on the Map View. The NHD represents the water drainage network of the United States, and includes features such as rivers, streams, canals, lakes, ponds, coastline, dams, and other hydrography-related data.
Note that this command works only within the United States.
Follow the steps below to download the river and stream data:
- From the Map Data ribbon menu, select the Hydrography Data menu item, and then choose the Rivers & Streams Download command.
- The Rivers & Streams Download dialog box will be displayed.
- The General Specifications section allows the user to specify the layer group name and location to save the downloaded shapefile. By default, the Layer group name is Rivers & Streams, which can be changed by the user. Click the […] button beside the Shapefile path entry to specify the directory location to save the downloaded GIS shapefiles.
- The Rivers & Streams Data Boundary Limits section allows the user to define the extent of the NHD map data to be downloaded. The following options are available for defining the extent of the NHD map data to be downloaded:
- Current screen limits: When this option is selected, the software will use the current extent of the Map View as a boundary limit for the NHD map data to be downloaded.
- User-defined limits: When this option is selected, the user can click on the [Pick] button and draw a rectangle region on the Map View to define the boundary limits for the NHD map data to be downloaded.
- Model extents: If a project model has been defined, this option will create a bounding rectangular region to correspond to the extents of the defined model, plus an additional buffer boundary.
- When all the options have been defined, click the [OK] button and the software will load and display the hydrography layers on the Map View.
- In the Map Data Layers panel, the software provides a data legend for each hydrography layer that lists the hydrography data included with that layer. Expand the layer to see the data legend.