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Roadmap: Expo Spatial Layer 🗺️

This document outlines the strategic phases of development for the Expo Spatial Layer Engine. Our goal is to provide the most performant, production-ready GIS engine for React Native.

✅ Phase 1: Core Engine (Completed)

  • JSI/C++ integration with direct memory access.
  • Normalized Web Mercator projection logic.
  • Basic viewport culling.
  • Binary Zero-Copy data transfer via TypedArrays.

✅ Phase 2: Native Synchronization (Completed)

  • Integration with Google Maps via Native TileOverlay.
  • Native-to-C++ bridge (JNI) for instant camera updates.
  • QuadTree Integration: $O(\log n)$ spatial indexing for rendering and picking.
  • Agnostic Styling: Dynamic color mapping from JS to the tile renderer.
  • Result: Perfect sync with 1M+ points and <0.5ms interaction latency.

🚀 Phase 3: Production Readiness (Active)

1. 🍎 Full iOS Parity

  • Implement MKTileOverlay in Swift/Objective-C++.
  • Consume the same C++ QuadTree instance on iOS.
  • Parity for pointStyles and onPointClick events.

2. 🧩 Dynamic Clustering

  • Implement $O(n)$ super-clustering in C++.
  • Allow visualization of millions of points at low zoom levels without clutter.
  • Support for cluster counts and automatic expansion on zoom.

3. 🔥 Heatmap Mode

  • GPU-accelerated density maps.
  • Use point weights to generate Gaussian-blurred heat gradients.

🛠️ Phase 4: Developer Experience & Ecosystem

1. 🌐 Web Support (WASM)

  • Port the QuadTree engine to WebAssembly.
  • Provide a JS fallback for MapLibre-GL or Leaflet on the web.

2. 📂 GeoJSON & Vector Support

  • Native GeoJSON parser to avoid JS overhead for standard GIS formats.
  • Support for LineString and Polygon rendering.

3. 🎨 Advanced Styling API

  • Property-based styling (e.g., scale points based on a "magnitude" attribute).
  • Transitions and animations for point updates.

Contributing

We are currently focusing on iOS Parity. If you have experience with Objective-C++ and MapKit, we'd love your help! Check out CONTRIBUTING.md.
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