geonative-proj

Pure-Rust projection engine for the geonative geospatial library. No PROJ, no C dep.

v0.1 coverage

• Spherical Mercator: EPSG:4326 ↔ EPSG:3857
• Transverse Mercator (Krüger n-series, 6th order) — shared between:
  • WGS84/UTM zones 1–60 N+S (EPSG:32601–32760)
  • GDA2020/MGA zones 46–59 (EPSG:7846–7859) — TM on GRS80
• GDA2020 geographic (EPSG:7844) treated as identity with EPSG:4326 — ~1.5 m caveat for visualisation; full Helmert 7-parameter transform deferred to v0.2.

Usage

use geonative_proj::Transformer;
use geonative_core::Coord;

let t = Transformer::from_epsg(7855, 4326)?;   // Vicmap MGA Zone 55 → WGS84
let mut c = Coord::xy(500000.0, 5800000.0);
t.transform(&mut c)?;
println!("{}, {}", c.x, c.y);  // ~144.96, -37.81
# Ok::<(), geonative_proj::ProjError>(())

Roadmap

• Lambert Conformal Conic, Albers Equal Area, Polar Stereographic
• WKT / PROJJSON parsing for Crs::Wkt and Crs::Projjson
• NTv2 grid shifts (optional geonative-proj-grids sibling crate)
• Full Helmert 7-param datum transforms (4326 ↔ 7844 survey-grade)