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I use a geographic information system (GIS). Can I download National Atlas map layers or connect to them as Web services? 

Yes and they're free. Nearly all map layers presented within our Map Maker are available for use outside the National Atlas. You can download these map layers at no cost using file transfer protocol (FTP). See our National Atlas Data Download page for more information about downloading National Atlas map layers.

You can also embed the National Atlas in your own application if your code takes advantage of the evolving Web Map Service (WMS) or Web Feature Service (WFS) specifications from the Open Geospatial Consortium. Please note that thematic data and a WMS for thematic data will not be available from The National Map when the National Atlas is taken offline on September 30, 2014.

Tags: Maps, National Atlas, Geospatial