Marco Ruocco
نویسنده
چکیده
Terrain data can be stored in a variety of data structures, data models and data formats. A data structure is the internal representation or machine storage method, while a data format is the actual specification of the data structure, and provides a scheme for the systematic storage of data for transfer, processing and retrieval. A data model instead is a more complex entity that, in this tentative definition, represents the phenomenon of terrain according to its ontology (e.g. inherent characteristics) and it is therefore at a more abstract and conceptually higher level than the other two. More specifically a data model of terrain implies a continuous view of the surface under consideration (Kumler 1992). The view employed here considers all terrain representations first as data structures (because they are physically stored as structures in bits and bytes) and then, in their continuity implications, as data models. In other words, different data structures imply different surface characteristics, beyond the data that they actually contain (e.g. contour representation implies a smooth terrain). The objective of this paper is to review the major and emergent data structures for terrain representation, their data models implications and a sample of the formats in which they are distributed.
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تاریخ انتشار 2001