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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

4.7 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

Richland County, SC

county

45079

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
422117	90969	271680	59468	63784	17.2	60.27	6.45	242800	0.4851	10.47	170439	200284	12651	885	27169	155853

to	rel	area_weight
us/states/sc/districts/06	in-district	0.535

to	rel	area_weight
us/states/sc/districts/02	in-district	0.4602

to	rel	area_weight
us/states/sc/districts/senate/21	in-district	0.4548

to	rel	area_weight
us/states/sc/districts/senate/19	in-district	0.1815

to	rel	area_weight
us/states/sc/districts/senate/35	in-district	0.1478

to	rel	area_weight
us/states/sc/districts/senate/22	in-district	0.1211

to	rel	area_weight
us/states/sc/districts/senate/18	in-district	0.0818

to	rel	area_weight
us/states/sc/districts/senate/26	in-district	0.0129

to	rel	area_weight
us/states/sc/districts/house/70	in-district	0.3344

to	rel	area_weight
us/states/sc/districts/house/52	in-district	0.1259

to	rel	area_weight
us/states/sc/districts/house/73	in-district	0.1147

to	rel	area_weight
us/states/sc/districts/house/78	in-district	0.1058

to	rel	area_weight
us/states/sc/districts/house/71	in-district	0.0861

to	rel	area_weight
us/states/sc/districts/house/77	in-district	0.0753

to	rel	area_weight
us/states/sc/districts/house/41	in-district	0.0423

to	rel	area_weight
us/states/sc/districts/house/72	in-district	0.0279

to	rel	area_weight
us/states/sc/districts/house/76	in-district	0.0243

to	rel	area_weight
us/states/sc/districts/house/79	in-district	0.0216

to	rel	area_weight
us/states/sc/districts/house/74	in-district	0.0209

to	rel	area_weight
us/states/sc/districts/house/75	in-district	0.0203

field	source
demographics	Census ACS 2023

field	source
districts	PostGIS area-intersection over Census TIGER 2024 boundaries

official

jurisdiction

county

2026-07-03

Richland County, SC

County jurisdiction — 1 officeholders mapped.

Demographics (ACS 2023)

Measure	Value
Population	422117
Under 18	90969
18–64	271680
65+	59468
Median household income	63784
Poverty rate	17.2
Homeownership rate	60.27
Unemployment rate	6.45
Median home value	242800
Gini index	0.4851
Vacancy rate	10.47
White	170439
Black	200284
Asian	12651
Native	885
Hispanic/Latino	27169
Bachelor's or higher	155853

Districts

SC-06 — 54% (congressional)
SC-02 — 46% (congressional)
SC Senate District 21 — 45% (state senate)
SC Senate District 19 — 18% (state senate)
SC Senate District 35 — 15% (state senate)
SC Senate District 22 — 12% (state senate)
SC Senate District 18 — 8% (state senate)
SC Senate District 26 — 1% (state senate)
SC House District 70 — 33% (state house)
SC House District 52 — 13% (state house)
SC House District 73 — 11% (state house)
SC House District 78 — 11% (state house)
SC House District 71 — 9% (state house)
SC House District 77 — 8% (state house)
SC House District 41 — 4% (state house)
SC House District 72 — 3% (state house)
SC House District 76 — 2% (state house)
SC House District 79 — 2% (state house)
SC House District 74 — 2% (state house)
SC House District 75 — 2% (state house)

Source

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

4.7 KiB Raw Blame History Unescape Escape

Richland County, SC

Demographics (ACS 2023)

Districts

Source

4.7 KiB

Raw Blame History