For more information, please follow the link: 9.0 - Download and Cart.
Data from The National Map is free and in the public domain.  We use the "Cart" and "Checkout" terminology in TNM viewer only as a tracking mechanism to maintain download statistics.
USGS has implemented delivery of staged data from The National Map for themes, such as Contours, Elevation, Hydrography, Land Cover, and Orthoimagery, that no longer require custom clipping.
USGS has developed a ScienceBase Product Index API that will support calling our catalog of over two million staged data files.
Use the following procedures:  1) Use the Add Data tool in the Advanced toolbar in the upper middle of the map display.  2) Select KML/RSS and enter either a file or URL.
Digital Elevation Models (DEMs) are staged at resolutions of 2 arc-second in Alaska (about 60 meters north-south, and varies from 20-35 meters east-west), 1 arc-second (about 30 meters), and 1/3 arc-second (about 10 meters), and are available
To help in the transition of raster data to different file formats, a set of scripts is available at
An error may sometimes occur which times out the web browser after clicking on a download pop-up window. If you just try refreshing, it may open the archive (.zip) file. This occurrence randomly happens with download of Elevation and Orthoimagery data
If you select too many product themes, such as every theme in the initial USGS Available Data for download selection box, you get this type of behavior where the dropdown menus are hidden.  We recommend that you try downloading only up to five themes a