Section 04 · 4 entries
Boundaries
Lines drawn around counts, and the features they borrow.
Statistical geography starts from a target population and finds lines to fit it, which is the reverse of how it reads.
Photo: 1930 Enumeration District Map, Polk County, IA - NARA - 117090788 · Wikimedia CommonsEntries in Boundaries
Ref · subject · read- 016 A census tract is drawn around a numberStatistical geography starts from a target population and finds lines to fit it, which is the reverse of how it reads. 3 min
- 017 Borrowed featuresBoundaries follow rivers, roads and ridges because those were already surveyed — and inherit their errors. 2 min
- 018 When the feature movesA boundary tied to a river that has since shifted. Which one wins depends on the wording. 2 min
- 019 Block levelThe smallest published unit, and why it is published at all. 2 min