NDLI: Accurate modeling of region data

Content Provider	IEEE Xplore Digital Library
Author	Proietti, G. Faloutsos, C.
Copyright Year	1989
Abstract	Spatial data appear in numerous applications, such as GIS, multimedia and even traditional databases. Most of the analysis on spatial data has focused on point data, typically using the uniformity assumption, or, more accurately, a fractal distribution. However, no results exist for nonpoint spatial data, like 2D regions (e.g., islands), 3D volumes (e.g., physical objects in the real world), etc. This is exactly the problem we solve in this paper. Based on experimental evidence that real areas and volumes follow a "power law," that we named REGAL (REGion Area Law), we show 1) the theoretical implications of our model and its connection with the ubiquitous fractals and 2) the first of its practical uses, namely, the selectivity estimation for range queries. Experiments on a variety of real data sets (islands, lakes, and human-inhabited areas) show that our method is extremely accurate, enjoying a maximum relative error ranging from 1 to 5 percent, versus 30-70 percent of a naive model that uses the uniformity assumption.
Sponsorship	IEEE IEEE Comput. Soc. Tech. Committee on Data Eng IEEE Computer Society
Starting Page	874
Ending Page	883
Page Count	10
File Size	290626
File Format	PDF
ISSN	10414347
Volume Number	13
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Database systems Geographic Information Systems Multimedia databases Fractals Object oriented modeling Multidimensional systems Spatial databases Data analysis Image databases Application software
Content Type	Text
Resource Type	Article
Subject	Information Systems Computational Theory and Mathematics Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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