Pure Science

National Land Cover Data Classification Schemes

"NLCD 1992 was a success, and its success had a lot to do with building the momentum for NLCD 2001. NLCD 2001 improves upon NLCD 1992 in three important ways. Whereas NLCD 1992 was simply a land-cover data set, NLCD 2001 is a land-cover database comprised of three elements: land cover, impervious surface and canopy density. Second, NLCD 2001 used improved classification algorithms, which have resulted in data with more precise rendering of spatial boundaries between the 16 classes (an additional nine classes are available in coastal areas and another four classes in Alaska only).

"NLCD 1992 was a success, and its success had a lot to do with building the momentum for NLCD 2001. NLCD 2001 improves upon NLCD 1992 in three important ways. Whereas NLCD 1992 was simply a land-cover data set, NLCD 2001 is a land-cover database comprised of three elements: land cover, impervious surface and canopy density. Second, NLCD 2001 used improved classification algorithms, which have resulted in data with more precise rendering of spatial boundaries between the 16 classes (an additional nine classes are available in coastal areas and another four classes in Alaska only).

Mathematics Subject Classification

"The current 2010 Mathematics Subject Classification (MSC2010) is a revision of the MSC2000 that has been used by MR and Zbl since 2000. MSC2010 is the result of a collaborative effort by the editors of MR and Zbl to update their shared classification. These editors acknowledge the many helpful suggestions from the mathematical community during the revision process over more than two years."

Physics and Astronomy Classification Scheme

"The Physics and Astronomy Classification Scheme® (PACS) was developed by the American Institute of Physics (AIP) and has been used in Physical Review since 1975 to identify fields and sub-fields of physics. It is used in a variety of ways, for example, in the online journals as a tool in searching for articles by subject. PACS is arranged hierarchically, by subdivision of the whole spectrum of subject matter in physics- and astronomy-related sciences into segments and then repeating the process of subdivision down to four levels. The latest edition of PACS is the 2010 edition."

"The Physics and Astronomy Classification Scheme® (PACS) was developed by the American Institute of Physics (AIP) and has been used in Physical Review since 1975 to identify fields and sub-fields of physics. It is used in a variety of ways, for example, in the online journals as a tool in searching for articles by subject. PACS is arranged hierarchically, by subdivision of the whole spectrum of subject matter in physics- and astronomy-related sciences into segments and then repeating the process of subdivision down to four levels. The latest edition of PACS is the 2010 edition."

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.

Eigenschaften-Quellen-Index

"Der Eigenschaften-Quellen-Index weist Datenbanken, Nachschlagewerke und Websites für physiko-chemische und andere stoffbezogene Eigenschaften (Daten, Definition, Messung) nach. Er ist als System zweier verschränkter Thesauri für physikalische Eigenschaften und chemische Systeme realisiert. Physikalische Eigenschaften: 855 Deskriptoren, 347 Synonyme, 126 Facetten. Angegeben werden Eigenschaftsname, Synonyme und Übersetzungen, eine Definition sowie gebräuchliche Symbole und physikalische Einheiten gemäss IUPAC "Green Book". Chemische Systeme: Noch im Aufbau begriffen.

"The properties-source index provides databases, reference works, and websites for physico-chemical and other material-related properties (data, definition, measurement), realized as a system of two entangled thesauri for physical properties and chemical systems , 347 synonyms, 126 facets, the following are given: property names, synonyms and translations, a definition and common symbols and physical units according to the IUPAC "Green Book." 326 descriptors, 70 synonyms Sources: Round 830 Sources: Databases, reference books, websites, etc.

Department of the Environment and Heritage Thesaurus

"The DEH thesaurus is broadly based on a subset of the Thesaurus of Environmental Protection Terms, Department of Environmental Protection, WA, 1995. Over the years, current specific Commonwealth terminology has been incorporated into the thesaurus. The Department of the Environment and Heritage thesaurus is used to provide access to DEH web resources."

Geologische Bundesanstalt Thesaurus

"Der Thesaurus enthält Begriffe, wie sie in den Text-Publikationen und geologischen Karten der Bundesanstalt verwendet werden. Alle Begriffe haben eigene http-Webadressen, welche als Hyperlinks für Online-Texte, in Webanwendungen, oder als Attribute zu Geodaten verwendet werden können. Jeder einzelne Begriff kann auch mehrere alternative Namen besitzen, und ist in seiner Bedeutung (Semantik) durch übergeordnete, untergeordnete und verwandte Begriffe festgelegt.

"The thesaurus contains terms, as used in the text publications and geological maps of the Federal Institution, all of which have their own http web addresses, which can be used as hyperlinks for online texts, in web applications, or as attributes for geodata Single term can also have several alternative names, and is defined in its meaning (semantics) by superior, subordinate, and related terms.

Convention on Biological Diversity Controlled Vocabulary

"It facilitates searching and retrieving information by linking similar documents and on-line resources with unique terms. It standardizes descriptions, and so assists in efforts to make information interoperable. Because most terms are taken from official Convention documents, UNEP's ENVOC, and FAO’s AGROVOC, the translation of these terms is facilitated. The CBD Controlled Vocabulary was developed in 2003 with the intent to establish a list of terms to be used as descriptors (i.e. metadata) for CBD documents and web pages."

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