Abstract
The Topologically Integrated Geographic Encoding and Referencing (TIGER) data base is the Census Bureau's primary source for map production. Collecting and chaining the TIGER data base's topological elements of 0-cells (points), 1-cells (lines), and 2-cells (areas) into meaningful cartographic objects is a major step in map creation. Rather than have each mapping application directly access the TIGER data base and independently perform the chaining process, the Census Bureau creates a secondary data base – a cartographic extract – from which mapping applications retrieve the coordinate strings of pre-chained cartographic objects. While developed initially to reduce overall computer processing requirements, the cartographic extract has additional implications for mapping applications, such as providing a conceptual framework for approaching the mapping task and enhancing the preproduction decision-making processes.
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