USGS EROS has provided the following web services that can be used by the public to build custom applications:

• Elevation — Use the Elevation Service to obtain elevations from a variety of data sources for the United States, U.S. territories, and parts of North America.
• Graphics — Use the PDF Service to generate PDF documents composed of WMS map requests.
• Inventory — Use the Inventory Service to find out which datasets cover a specific geographic area. This service can also provide many characteristics of those datsets including download options, metadata URLs, and WMS information that can be used to request map images.
• Downloads — Use the Request Validation and Download Services to obtain full resolution data.

Service Name	REST (JSON)	SOAP (WSDL)	Description	Additional Info
Download_Service		Link	Use the Request Validation and Download Services to obtain full resolution data.	Users Guide 26 Feb 2010
Elevation Service		Link	Use the Elevation Service to obtain elevations from a variety of data sources for the United States, U.S. territories, and parts of North America.	Test page
Inventory Service	Link	Link	Use the Inventory Service to find out which datasets cover a specific geographic area. This service can also provide many characteristics of those datsets including download options, metadata URLs, and WMS information that can be used to request map images.	Users Guide 15 Mar 2013 Attributes 16 Dec 2009
PDF Service		Link
Request_Validation_Service		Link	Use the Request Validation and Download Services to obtain full resolution data.	Users Guide 13 Mar 2013

To view and print the PDF you must obtain and install the Acrobat® Reader, available at no charge from Adobe Systems.