A sea of undifferentiated information is forming from the body of data that is collected by people and organizations, across government, for different purposes, at different times, and using different methodologies. The resulting massive data heterogeneity requires automatic methods for data alignment, matching and/or merging. In this poster, we describe two systems, Guspin#8482; and Sift#8482;, for automatically identifying equivalence classes and for aligning data across databases. Our technology, based on principles of information theory, measures the relative importance of data, leveraging them to quantify the similarity between entities. These systems have been applied to solve real problems faced by the Environmental Protection Agency and its counterparts at the state and local government level.
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