The USGS Contour Web Service creates a vector shapefile of contours for the desired area, which the user inputs in terms of latitude and longitude. If desired, the user may also choose the contour interval and units and a name for the resulting shapefile. The generated files are packaged in one zipfile and placed on the USGS webserver where they are publicly available. This service returns a URL that can be used to obtain the finished file.
The following is a list of how-to and tutorial content that matched your search term. ProgrammableWeb's how-to content comes from two sources; full-blown tutorials that we publish ourselves and other highly relevant tutorials that we find elsewhere on the Web. This list represents on combination of both tutorial types and if you go to ProgrammableWeb's API University, you'll not only be able to find more, they are organized based on your role (API providers or developers who consumes APIs). If you know of a tutorial that would be of interest to the ProgrammableWeb community, we'd like to know about it. Be sure to check our guidelines for making contributions to ProgrammableWeb.