Geospatial coordinate library: China datums (GCJ-02/BD-09) and geodetic transforms.

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geocoordinates (language bindings)

UniFFI bindings for the geocoordinates geospatial library — China datums (GCJ-02 / BD-09), geodetic transforms.

A deliberately curated, flattened subset of the Rust API is exposed across the FFI boundary to Python, Kotlin, Swift, and TypeScript (Java consumes the Kotlin/JVM artifact). Generics, traits, operator overloads, and From/TryFrom conversions do not cross FFI, so they are re-expressed as flat records and free functions; approximate inverses keep their _fast / _refined names and carry an explicit max_error_m.

Surface

WGS-84 ↔ GCJ-02 ↔ BD-09 conversions (exact forward, approximate inverse with error bounds), Baidu Web Mercator, out_of_china, and haversine distance.

import geocoordinates_ffi as gc

gcj = gc.wgs84_to_gcj02(gc.Wgs84(lat=39.915, lon=116.404))
wgs = gc.gcj02_to_wgs84_refined(gcj)          # approximate inverse
print(wgs.lat, wgs.lon, "±", wgs.max_error_m, "m")

The WebAssembly/TypeScript bindings live in web/.

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0.1.1

Jun 12, 2026

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