Virginia

United States Patent Classification

"The USPC is a system for organizing all U.S. patent documents and many other technical documents into relatively small collections based on common subject matter. Each subject matter division in the USPC includes a major component called a class and a minor component called a subclass. A class generally delineates one technology from another. Subclasses delineate processes, structural features, and functional features of the subject matter encompassed within the scope of a class. Every class has a unique alphanumeric identifier, as do most subclasses.

U.S. National Vegetation Classification

"Classifying vegetation is a critical to sound ecological science and efficient land assessment, management and planning. The National Vegetation Classification (NVC) is a central organizing framework for how all vegetation in the United States is inventoried and studied, from broad scale formations (biomes) to fine-scale plant communities. The purpose of the NVC is to produce uniform statistics about vegetation resources across the nation, based on vegetation data gathered at local, regional, or national levels.

U.S. Geological Survey Library Classification System

"The U.S. Geological Survey Library classification system has been designed for earth science libraries. It is a tool for assigning call numbers to earth science and allied pure science materials in order to collect these materials into related subject groups on the library shelves and arrange them alphabetically by author and title. The classification can be used as a retrieval system to access materials through the subject and geographic numbers.

Defense Technical Information Center Thesaurus

"The Thesaurus provides a broad multidisciplinary subject term vocabulary that aids in information search and retrieval. Subject terms, called Descriptors, are organized into hierarchies, where series of narrower terms are linked to broader terms. After performing a Thesaurus search, a user can insert a Descriptor directly into the Technical Reports Guided Search page. 16463 terms, 8598 relations between terms, 2278 non-preferred terms."

U.S. Geological Survey Thesaurus

"The USGS Thesaurus is the principal controlled vocabulary supporting Science Topics. It is designed as a formal thesaurus conforming to ANSI/NISO Z39.19, with rigid adherence to the hierarchical (BT, NT) term relationships, generic non-hierarchical (RT) relationships, and lead-in term relationships linking non-preferred terms to descriptors either singly (UF) or in a compound USE-WITH relationship. The thesaurus is faceted, meaning its top terms delineate general aspects of information resources: Sciences: Major educational fields, fields of study, and professional groupings within USGS.

NASA Thesaurus

"The Hierarchical Listing With Definitions contains all subject terms and USE cross references currently approved for use, and displays the full hierarchical structure for each term along with a definition when available. In addition, the listing has been developed to serve as an orthographic authority for upper/lowercase forms of all terms and cross references. The term-added date, displayed for all terms added after April 1988, is also given.

AIRS/211 LA County Taxonomy of Human Services

"This site is a support tool which allows licensed subscribers to search the AIRS/211 LA County Taxonomy in a variety of ways, print the Taxonomy in various formats, download the file that will allow them to incorporate the Taxonomy in their database initially and keep it updated over time as the Taxonomy changes and grows, view recent changes and additions, and develop, save and share customized versions of the Taxonomy through the Filters function. Separate versions of the Taxonomy are available to U.S. and Canadian subscribers.

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