A tract code or name is not a stable promise of geographic equivalence across census years. A direct text join can confuse boundary change with social change.
The reveal compares Census relationship files with NHGIS interpolation crosswalks, provides a worked count-allocation example and supplies mass-balance and identifier checks. It separates estimated harmonization from exact observation.
Scope: US census geography and aggregate-count workflows. It does not supply a new population estimate for a real tract or a universal rule for every demographic variable. Sources checked 18 October 2026. #CensusGeography #DataHarmonization
The reveal compares Census relationship files with NHGIS interpolation crosswalks, provides a worked count-allocation example and supplies mass-balance and identifier checks. It separates estimated harmonization from exact observation.
Scope: US census geography and aggregate-count workflows. It does not supply a new population estimate for a real tract or a universal rule for every demographic variable. Sources checked 18 October 2026. #CensusGeography #DataHarmonization
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Categories: Articles & Guides [c74], United States [c77]