CSAC's generally define and delineate statistical entities following Census Bureau guidelines. The Census Bureau's staff linked the attribute information to the spatial framework of features. Most procedures for gathering the needed attributes are clerical. Preparations for the 1990 census involved making some minor updates in selected areas, but generally did not include changes in address numbering systems during the decade. Later during field operations, enumerators updated, verified, and corrected, when necessary, the addresses assigned to each block number by walking the perimeter and all interior streets of each census block.
Complete chains representing the limits of a file are free from gaps.
The Census Bureau performed automated tests to ensure logical consistency and limits of file. Programs and software have been developed by the Census Bureau programmers. Standard geographic codes, such as FIPS codes for States, counties, municipalities, and places are used when encoding spatial entities. For these two sources, data for a given category will contain attribute codes that reflect the information portrayed on the source. The digital line data for a given category of data contain at least the same level of content and detail as shown on the source.