An Object Model for Geologic Map Information
نویسندگان
چکیده
National geologic map databases are presently being constructed in the U.S. and Canada, as well as in several other countries. Here, we describe an object-based model for geologic map information, specifically designed to represent digital geologic maps and related geoscientific information. Although oriented to geoscience, several fundamental issues in representing geospatial information are explored in this design, including the philosophic and cognitive basis of mapping in general, and the overall framework in which map-related information can be represented. Thus, we take an ontologic approach to geospatial representation, supplemented by an epistemic view of the scientific process, which culminates in a very general model—a meta-model—for map information. Practical as well as theoretical considerations motivate this approach. Primarily, however, we describe the theoretical foundations of our meta-model, specifically semiotics, category theory, and ontology in geospatial information. Finally, we report briefly on a specific prototype data model derived from the meta-model and implemented in a commercial object-oriented GIS.
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