WPI Worcester Polytechnic Institute

Computer Science Department

Title: Temporal Extent for Global Change Research Databases

Author(s): Robert F. Dugan Jr., Nabil I. Hachem, and Michael A. Gennert, Computer Science Department, Worcester Polytechnic Institute, Worcester, MA 01609

Source: Proc. Wkshp. on Advances in Geographic Information Systems, Washington, DC, Nov. 1993.

Abstract: We propose temporal extent, a concept that can be used to produce summary or abstracted information about the values of temporal attributes in a database relation or class of objects. In its simplest form, the temporal extent is a one-dimensional interval representing the minimum and maximum time points of the instances in a class. More generally, a set of temporal intervals are used to capture the temporal coverage of a set of temporal objects or class. The summary provides information about the class in a compact form that can be used concurrently with statistical abstraction mechanisms for approximate query answering and for fast browsing.

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matt@cs.wpi.edu / Aug 8, 1996