wilayah

Location lookup for Indonesian villages by GPS coordinates or name.

Returns BMKG-compatible adm4 administrative codes (e.g., 31.71.03.1001) for 83,758 villages across Indonesia, based on the official Kemendagri decree (Kepmendagri No 300.2.2-2138 Tahun 2025) with coordinates computed from BIG (Badan Informasi Geospasial) polygon boundaries.

Features

• Nearest village search by GPS with Haversine distance
• Full-text search (FTS5) across village name, district, city, province
• Exact code lookup and hierarchical prefix queries
• Disambiguation helper (find_by_name_unique) for unambiguous results
• Single portable binary with embedded ~27 MB SQLite database (RTree spatial index)

Quick start (library)

use wilayah;

let conn = wilayah::open()?;

// Find nearest villages by GPS
let nearest = wilayah::find_nearest(&conn, -6.1647, 106.8453, 5)?;

// Search by name (FTS5, BM25 ranked)
let results = wilayah::find_by_name(&conn, "kemayoran", 10)?;

// Unambiguous lookup — returns Found, Ambiguous, or NotFound
let unique = wilayah::find_by_name_unique(&conn, "gambir")?;
println!("{unique}"); // "Gambir — Gambir, Kota Administrasi Jakarta Pusat, ... (31.71.05.1001)"

// Direct lookup by administrative code
let v = wilayah::find_by_code(&conn, "31.71.03.1001")?;

// List all villages in a kecamatan, kabupaten, or province (paginated)
let result = wilayah::find_by_code_prefix(&conn, "31.71.03", 100, 0)?;
println!("{} of {} villages", result.villages.len(), result.total);

Quick start (HTTP server)

cargo run --release --example serve

curl "http://localhost:3000/nearest?lat=-6.1647&lon=106.8453"
curl "http://localhost:3000/search?q=Kemayoran"
curl "http://localhost:3000/code?q=31.71.03.1001"
curl "http://localhost:3000/code?prefix=31.71.03"

Alternatively, build and run the binary directly:

cargo build --release
./target/release/examples/serve

API

GET /

Server info and village count.

GET /nearest

GET /search

GET /code

Provide either q or prefix. Exact lookup returns {"result": {...}} (or null), prefix returns {"results": [...], "total": N, "has_more": bool}.

Data

Data pipeline (build-time only):

• Kemendagri PDF (57 MB, 4,428 pages) → village codes and names via pdftotext parser
• BIG ArcGIS API → village polygon geometries → centroid computation (84 batches, 83k+ features)
• Merge → match by administrative code; fallback to kecamatan centroid for new villages (pemekaran)
• Build → SQLite with indexes, RTree, FTS5, SHA-256 signature

Building: download vs pipeline

By default, cargo build downloads a pre-built database from the GitHub Releases artifact (no build-time dependencies needed). This gives instant builds.

To rebuild the database from scratch (e.g., for data updates or verification), use the build_db example:

# Remove any cached database
rm -rf data/cache data/locations.db

# Run full pipeline (requires pdftotext, network access)
cargo run --example build_db --features build-db

# After it completes, you can build the library as usual
cargo build

Set WILAYAH_REFRESH_BIG=1 to force re-fetch from BIG API:

WILAYAH_REFRESH_BIG=1 cargo run --example build_db --features build-db

The build script (build.rs) downloads a pre-built database from the latest GitHub Release into OUT_DIR. If data/locations.db exists locally (from a previous pipeline run), it copies that instead.

Environment variables

Architecture

Components

• Library src/lib.rs: public API (open, find_nearest, find_by_name, etc.)
• Database layer src/db.rs: SQLite access (RTree, FTS5)
• Builder src/builder.rs: full data build process (PDF → BIG → DB)
• Build script build.rs: download shim (copies or downloads pre-built DB)
• Examples:
  • serve — axum HTTP API server (default)
  • build_db — CLI wrapper for Pipeline (requires build-db feature)
  • verify_legacy — compare official DB with legacy snapshot (no feature needed)

Build flow

cargo build → build.rs (download) → copy/Download DB → embed
cargo run --example build_db --features build-db → Pipeline.run() → build DB
cargo run --example verify_legacy → compare embedded DB vs data/cache/legacy_snapshot.json

The builder code lives in src/builder.rs, accessible as wilayah::builder when the build-db feature is enabled. Both the build_db example and any programmatic usage share the same Pipeline struct.

Verification

The verification tool compares the current database with the legacy community-sourced dataset (cahyadsn/wilayah) and prints a report:

cargo run --example verify_legacy

Output includes:

• New villages (present in official but not legacy)
• Missing villages (present in legacy but not official)
• Name differences
• Coordinate drift > 1km
• Hierarchy differences (district/city/province)

The verification code is not part of the build. The legacy snapshot is generated automatically on first official pipeline run and saved to data/cache/legacy_snapshot.json.

Disambiguation

find_by_name_unique() returns a LookupResult with Display support for CLI-friendly output:

Both Village and LookupResult implement Display and serde::Serialize.

License

MIT