Function write_trainpath_geojson 

pub fn write_trainpath_geojson(
    train_path: &TrainPath,
    netelements: &HashMap<String, Netelement>,
    writer: &mut impl Write,
) -> Result<(), ProjectionError>

Write TrainPath as GeoJSON FeatureCollection

Serializes a TrainPath to GeoJSON, with each segment as a separate feature. The overall path probability and metadata are stored in the FeatureCollection properties.

Arguments

• train_path - The TrainPath to serialize
• netelements - Map of netelement IDs to Netelement geometries (for creating LineString features)
• writer - Output writer

Output Format

{
  "type": "FeatureCollection",
  "properties": {
    "overall_probability": 0.89,
    "calculated_at": "2025-01-15T10:30:00Z",
    "distance_scale": 10.0,
    "heading_scale": 2.0
  },
  "features": [
    {
      "type": "Feature",
      "geometry": { "type": "LineString", "coordinates": [...] },
      "properties": {
        "netelement_id": "NE_A",
        "probability": 0.87,
        "start_intrinsic": 0.0,
        "end_intrinsic": 1.0,
        "gnss_start_index": 0,
        "gnss_end_index": 10
      }
    }
  ]
}