Decide on web map framework to use

### **MapLibre GL JS**
The most actively developed open source web map framework right now. It's a community fork of Mapbox GL JS (created after Mapbox changed to a proprietary license in 2021).

- WebGL-based, so very performant for large datasets
- Excellent vector tile support
- Strong ecosystem — most new OSS mapping tools are built on it
- Best choice for a new OSS project in 2024+

### **Leaflet**
The longtime standard for web mapping. Simple, lightweight, huge plugin ecosystem.

- Very easy to get started
- Canvas/SVG based (not WebGL) so less performant at scale
- Better for simpler use cases or projects that don't need 3D/tilt
- Massive community, tons of examples

### **OpenLayers**
The most feature-complete of the three. Popular in enterprise GIS and government applications.

- Very strong CRS and projection support (important for your use case)
- Handles WMS, WFS, OGC standards natively
- Steeper learning curve
- More verbose API than Leaflet or MapLibre

Compare MapLibre GL JS, Leaflet, and OpenLayers against the project's mapping requirements, especially large datasets, vector tiles, 3D/tilt, CRS and projection support, and OGC services. Record the selected framework and rationale in this issue; no files, tests, or entry points are mentioned.

Written by the indexing model from the issue text.