A probe center server (10) previously performs filtering to determine whether or not a projection norm of a link in a feature space can be interpolated, and notifies a probe terminal (20) to preferentially collect and upload detected probe data for the link whose missing data can not be interpolated...http://www.google.com/patents/US7555381?utm_source=gb-gplus-sharePatent US7555381 - Traffic information providing device, traffic information providing system, traffic information transmission method, and traffic information request method
