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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

3.1 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

Black Hawk County, IA

county

19013

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
131049	28744	79167	23138	66417	14.95	66.23	4.56	188900	0.4494	7.51	104148	12135	3565	382	6861	34410

to	rel	area_weight
us/states/ia/districts/02	in-district	1.0

to	rel	area_weight
us/states/ia/districts/senate/34	in-district	0.3564

to	rel	area_weight
us/states/ia/districts/senate/38	in-district	0.3543

to	rel	area_weight
us/states/ia/districts/senate/27	in-district	0.1927

to	rel	area_weight
us/states/ia/districts/house/68	in-district	0.3563

to	rel	area_weight
us/states/ia/districts/house/76	in-district	0.3188

to	rel	area_weight
us/states/ia/districts/house/54	in-district	0.1927

to	rel	area_weight
us/states/ia/districts/house/62	in-district	0.0561

to	rel	area_weight
us/states/ia/districts/house/61	in-district	0.0405

to	rel	area_weight
us/states/ia/districts/house/75	in-district	0.0355

field	source
demographics	Census ACS 2023

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

official

jurisdiction

county

2026-07-03

Black Hawk County, IA

County jurisdiction — 2 officeholders mapped.

Demographics (ACS 2023)

Measure	Value
Population	131049
Under 18	28744
18–64	79167
65+	23138
Median household income	66417
Poverty rate	14.95
Homeownership rate	66.23
Unemployment rate	4.56
Median home value	188900
Gini index	0.4494
Vacancy rate	7.51
White	104148
Black	12135
Asian	3565
Native	382
Hispanic/Latino	6861
Bachelor's or higher	34410

Districts

IA-02 — 100% (congressional)
IA Senate District 34 — 36% (state senate)
IA Senate District 38 — 35% (state senate)
IA Senate District 27 — 19% (state senate)
IA House District 68 — 36% (state house)
IA House District 76 — 32% (state house)
IA House District 54 — 19% (state house)
IA House District 62 — 6% (state house)
IA House District 61 — 4% (state house)
IA House District 75 — 4% (state house)

Source

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

3.1 KiB Raw Blame History Unescape Escape

Black Hawk County, IA

Demographics (ACS 2023)

Districts

Source

3.1 KiB

Raw Blame History