Strategies which, when implemented, enable disparate data to be combined in a single analysis. Includes combination of similar data from small components into larger, coherent assemblages as well as recognizing and exploiting relationships linking or connecting data that are maintained separately. May include efforts to make scientific information more easily found and obtained.
Explains how the NHD specifies point locations within streams by using a code to indicate the reach (including the hydrologic unit) and a measure, which indicates how far the point is from the downstream end of the reach.
Tutorial on geospatial semantics with hands-on exercises using standard Web browsers, divided into two sections, general semantics on the Web and specific examples of geospatial semantics using data from The Open Ontology Repository.