Reference Systems
نویسندگان
چکیده
منابع مشابه
Time and Reference Systems
Geodesy is the science of the measurement and mapping of the Earth’s surface, and in this context it is also the science that defines and realizes coordinates and associated coordinate systems. Geodesy thus is the foundation for all applications of GNSS. This chapter presents the reference systems needed to describe coordinates of points on the Earth’s surface or in near space and to relate coo...
متن کاملSemantic reference systems
Four centuries after René Descartes watched a fly walk across his ceiling and wondered how to capture its position (Gribbin 2002), we use Cartesian coordinates routinely to describe locations. We identify the positions of entities in the real world, transform their GIS representations from one coordinate system to another, and integrate spatially referenced data across multiple coordinate syste...
متن کاملSemantic Reference Systems for
What is needed to enable communication about observation and measurement results in information systems? Information system ontologies make a certain conceptualization explicit and partially account for the meanings of symbols associated with this conceptualization. Yet, the meaning of symbols denoting observation results such as /100m/, /328ft/ or /deep/ cannot be specified with currently avai...
متن کاملImplementing Semantic Reference Systems
The analogy of Semantic Reference Systems proposed in (Kuhn in press) is being explored here with respect to the computational mechanisms it suggests. Semantic referencing, grounding in a semantic datum, semantic projection, and semantic transformation are defined and demonstrated through an implementation of a semantic reference system for a simple vehicle navigation model. The idea of wrappin...
متن کاملIntelligent Systems Reference Library 36
Traditional query processing techniques have played a major role in the success of relational Database Management Systems over the last decade. However, they do not obviously extend to much more challenging, unorganized and unpredictable data providers, typical of emerging data intensive applications and novel processing environments. For them, advanced query processing and data integration app...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1997
ISSN: 0252-9211
DOI: 10.1017/s025292110004642x