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Change Log

0.0.4 - 2026-04-15

Added

  • Single-call PROJ pipeline: forward + affine + inverse Mercator collapse into one WASM call via proj_create. Falls back to two-call path for compound CRS
  • Global projection support: Robinson, Mollweide, Eckert IV, and other world projections now render correctly
  • Initial test suite and benchmark
  • Local dev server with COOP/COEP headers

Fixed

  • Aspect ratio distortion on global projections: tile-local Y was encoded linear in latitude instead of Mercator Y. Uniform affine scale now preserves aspect ratio
  • Broken geometry at low zoom: pre-clip features to a 90-degree geographic grid before reprojecting, to avoid globe-spanning polygons producing irrecoverable topology errors after reprojection

Changed

  • getWorldBounds computes correct reprojected extent
  • Inverse Mercator transform shared as singleton (minor performance improvement)
  • proj-wasm bumped to ^0.1.0-alpha8 (PROJ 9.8.0 to 9.8.1)

Known Limitations

  • Interrupted projections (Goode Homolosine, etc.) are not supported

0.0.3 - 2026-03-15

Changed

  • transformCoordsF64() is now the sole transform engine; transformCoords() delegates to it. Both are exported.
  • reprojectGeoJSON() uses Float64Array internally, eliminating intermediate [number,number][] allocations
  • Clip envelope built via createEnvelope()/toGeometry() instead of GeoJSONReader parse
  • Clip fully-inside check expanded with 1% buffer to skip more geometric intersections
  • Validity repair (GeometryFixer.fix) skipped for point geometries
  • Finer-grained profiling breakdown (isValid vs fixRepair, geojsonRead/Write, densify ratio)
  • Made proj-wasm a dependency of backproj, made backproj a dependency of maplibre-proj

Removed

  • reprojectTile() standalone function — use createTileProcessor().reprojectTile() instead
  • mvt.ts module removed; FetchTileFn and OutputFeature types now exported from mvt-pipeline.ts

0.0.2 - 2026-03-11

Added

  • MVT reprojection via worker pool with input/output tile caching
  • Demo page shows both GeoJSON and MVT layers with data mode selector
  • Debug tile boundary overlay via reprojectStyle tileBoundaries option
  • __DEV__ build split: prod builds eliminate all profiling code

Fixed

  • Protocol handler errors on CRS change (stale protocol removed before MapLibre finished with it)

Changed

  • wasmts dependency updated to 0.1.0-alpha4
  • Demo page loads wasmts from CDN via import map instead of local script tag

0.0.1 - 2026-03-08

Added

  • backproj core package: projection-agnostic coordinate transformation via proj-wasm
    • initProj(), buildTransformer(crs), transformCoords(), transformPoint(), getWorldBounds()
    • reprojectGeoJSON() for batch reprojection of GeoJSON FeatureCollections
    • Accepts EPSG/ESRI codes, PROJ strings, WKT, PROJJSON
    • Rejects geographic CRS and interrupted projections at build time
    • Antimeridian-crossing and non-finite coordinate filtering (per-ring, handles MultiPolygon correctly)
  • maplibre-proj wrapper package: reprojectStyle() reprojects all inline GeoJSON sources in a MapLibre style and returns fake Mercator bounds for fitBounds()
  • npm workspaces monorepo structure
  • Browser demo page (docs/index.html)
    • CRS selector with searchable PROJ database browser and manual input mode (PROJ strings, WKT, .prj upload)
    • GeoJSON layer management: add by URL, upload file, remove, per-layer color/opacity
    • Default layers: Natural Earth 110m land, graticules, and countries
    • coi-serviceworker for SharedArrayBuffer on static hosting