Files
republic-os/data/jurisdictions/us/states/sc/counties/kershaw/index.md
T
Fabio 1beeaab2db Graph: national county↔district↔legislator authority layer
The first edges in the repo. Every US county now links to the districts it
sits in, weighted by area overlap, and every legislator links to the district
they represent — county → district → representative, traversable.

Data (PostGIS, no Atlas dependency — computed directly from geometry):
- data/county_district_edges.jsonl — 16,328 weighted edges. area_weight =
  ST_Area(ST_Intersection(county, district))/ST_Area(county) over ST_MakeValid
  Census TIGER 2024 geometries, overlaps <0.5% dropped. Uses area-intersection,
  NOT centroid-in-polygon, so urban districts that carve through counties
  (e.g. GA CD-5 / Atlanta across Clayton+DeKalb+Fulton) are captured, not
  silently dropped. Per-county weights sum to ~1.0 per district type.

build.py:
- ~6,896 new district nodes: 435 CD (ACS demographics where available; sparse
  for the 8 states missing from acs_cd) + 4,927 state-house + 1,897 state-senate
  (geometry-only). GEOID/number-keyed, stable.
- county index.md gains a `districts:` block (frontmatter) + a ## Districts
  section (body links, so link-integrity checks them).
- legislators + US House members gain `represents:` pointing at their district
  node; edge stored once on the person, inverse left to the view.
- schemas/jurisdiction: classification enum + chamber/districts fields.

Honest gaps (logged, not hidden): ID + NH have no state-house geometry, so
their house districts get nodes (represents resolves) but no county edges;
CD nodes for acs_cd-missing states are demographically sparse.

Deterministic (byte-identical rebuild); validate.py passes 26,617 records,
link-integrity clean (every district/represents link resolves).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-04 22:28:08 -04:00

2.7 KiB
Raw Blame History

type, title, classification, fips, state, demographics, districts, sources, confidence, tags, timestamp
type title classification fips state demographics districts sources confidence tags timestamp
Jurisdiction Kershaw County, SC county 45055 SC
population population_under_18 population_18_64 population_65_plus median_household_income poverty_rate homeownership_rate unemployment_rate median_home_value gini_index vacancy_rate race_white race_black race_asian race_native hispanic bachelors_plus
68314 15860 39530 12924 68231 13.16 82.04 4.75 217100 0.4537 10.74 45586 16215 474 334 4057 15665
to rel area_weight
us/states/sc/districts/05 in-district 0.999
to rel area_weight
us/states/sc/districts/senate/27 in-district 0.5589
to rel area_weight
us/states/sc/districts/senate/35 in-district 0.441
to rel area_weight
us/states/sc/districts/house/65 in-district 0.3205
to rel area_weight
us/states/sc/districts/house/45 in-district 0.223
to rel area_weight
us/states/sc/districts/house/50 in-district 0.2211
to rel area_weight
us/states/sc/districts/house/70 in-district 0.1473
to rel area_weight
us/states/sc/districts/house/52 in-district 0.0881
field source
demographics Census ACS 2023
field source
districts PostGIS area-intersection over Census TIGER 2024 boundaries
official
jurisdiction
county
sc
2026-07-03

Kershaw County, SC

County jurisdiction — 1 officeholders mapped.

Demographics (ACS 2023)

Measure Value
Population 68314
Under 18 15860
1864 39530
65+ 12924
Median household income 68231
Poverty rate 13.16
Homeownership rate 82.04
Unemployment rate 4.75
Median home value 217100
Gini index 0.4537
Vacancy rate 10.74
White 45586
Black 16215
Asian 474
Native 334
Hispanic/Latino 4057
Bachelor's or higher 15665

Districts

Source

  • demographics: Census ACS 2023
  • districts: PostGIS area-intersection over Census TIGER 2024 boundaries