gadm-boundaries

Native C++ boundaries batch generator for the GADM pipeline.
Uses GDAL/GEOS/PROJ for 10–100× speedup over the TypeScript pipeline on geometry union + GHS raster enrichment.

Prerequisites

Tool	Version
CMake	≥ 3.20
C++ compiler	C++20 (MSVC, GCC, or Clang)
vcpkg	Latest (set `VCPKG_ROOT` env var)

Setup

# Install native dependencies (one-time)
vcpkg install

Build

# Release (Ninja)
cmake --preset vcpkg
cmake --build build --config Release

# Windows MSVC
cmake --preset vcpkg-win
cmake --build build --config Release

# Debug
cmake --preset dev
cmake --build build/dev

Usage

# All countries, all levels
./build/boundaries --country=all

# Single country, specific level
./build/boundaries --country=DEU --level=0

# Force regeneration (ignore cache)
./build/boundaries --country=NGA --force

Output goes to cache/gadm/boundary_{code}_{level}.json — drop-in replacement for the TS pipeline.

Architecture

See docs/cpp-port.md for the full spec.

src/
├── main.cpp          # CLI entry, country loop, cache logic
├── gpkg_reader.h/cpp # GeoPackage → features (OGR)
├── geo_merge.h/cpp   # Geometry union (GEOS)
├── ghs_enrich.h/cpp  # GeoTIFF raster sampling + PIP
├── pip.h             # Inline ray-casting point-in-polygon
└── types.h           # BoundaryFeature, BoundaryResult structs

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