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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

4.9 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

Montgomery County, MD

county

24031

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
1065949	243139	641671	181139	132450	7.45	65.3	4.93	640300	0.4691	4.26	448341	198264	164064	6190	223958	695754

to	rel	area_weight
us/states/md/districts/08	in-district	0.549

to	rel	area_weight
us/states/md/districts/06	in-district	0.4193

to	rel	area_weight
us/states/md/districts/04	in-district	0.0287

to	rel	area_weight
us/states/md/districts/senate/15	in-district	0.3608

to	rel	area_weight
us/states/md/districts/senate/14	in-district	0.2325

to	rel	area_weight
us/states/md/districts/senate/16	in-district	0.0814

to	rel	area_weight
us/states/md/districts/senate/19	in-district	0.078

to	rel	area_weight
us/states/md/districts/senate/9	in-district	0.0618

to	rel	area_weight
us/states/md/districts/senate/39	in-district	0.0574

to	rel	area_weight
us/states/md/districts/senate/17	in-district	0.0492

to	rel	area_weight
us/states/md/districts/senate/18	in-district	0.0406

to	rel	area_weight
us/states/md/districts/senate/20	in-district	0.0376

to	rel	area_weight
us/states/md/districts/house/15	in-district	0.3608

to	rel	area_weight
us/states/md/districts/house/14	in-district	0.2325

to	rel	area_weight
us/states/md/districts/house/16	in-district	0.0814

to	rel	area_weight
us/states/md/districts/house/19	in-district	0.078

to	rel	area_weight
us/states/md/districts/house/9a	in-district	0.0618

to	rel	area_weight
us/states/md/districts/house/39	in-district	0.0574

to	rel	area_weight
us/states/md/districts/house/17	in-district	0.0492

to	rel	area_weight
us/states/md/districts/house/18	in-district	0.0406

to	rel	area_weight
us/states/md/districts/house/20	in-district	0.0376

field	source
demographics	Census ACS 2023

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

official

jurisdiction

county

2026-07-03

Montgomery County, MD

County jurisdiction — 2 officeholders mapped.

Demographics (ACS 2023)

Measure	Value
Population	1065949
Under 18	243139
18–64	641671
65+	181139
Median household income	132450
Poverty rate	7.45
Homeownership rate	65.3
Unemployment rate	4.93
Median home value	640300
Gini index	0.4691
Vacancy rate	4.26
White	448341
Black	198264
Asian	164064
Native	6190
Hispanic/Latino	223958
Bachelor's or higher	695754

Districts

MD-08 — 55% (congressional)
MD-06 — 42% (congressional)
MD-04 — 3% (congressional)
MD Senate District 15 — 36% (state senate)
MD Senate District 14 — 23% (state senate)
MD Senate District 16 — 8% (state senate)
MD Senate District 19 — 8% (state senate)
MD Senate District 9 — 6% (state senate)
MD Senate District 39 — 6% (state senate)
MD Senate District 17 — 5% (state senate)
MD Senate District 18 — 4% (state senate)
MD Senate District 20 — 4% (state senate)
MD House District 15 — 36% (state house)
MD House District 14 — 23% (state house)
MD House District 16 — 8% (state house)
MD House District 19 — 8% (state house)
MD House District 9A — 6% (state house)
MD House District 39 — 6% (state house)
MD House District 17 — 5% (state house)
MD House District 18 — 4% (state house)
MD House District 20 — 4% (state house)

Source

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

4.9 KiB Raw Blame History Unescape Escape

Montgomery County, MD

Demographics (ACS 2023)

Districts

Source

4.9 KiB

Raw Blame History