{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://prekzursil.github.io/tracelines/docs/schema/coverage.schema.json",
  "title": "tracelines coverage GeoJSON",
  "description": "A GeoJSON FeatureCollection of continuous street-level coverage polylines (EPSG:4326, coordinates are [lon, lat]).",
  "type": "object",
  "required": ["type", "features"],
  "properties": {
    "type": { "const": "FeatureCollection" },
    "features": { "type": "array", "items": { "$ref": "#/$defs/feature" } },
    "properties": {
      "type": "object",
      "description": "Optional run metadata (stats, counts) added by the proxy/CLI."
    }
  },
  "$defs": {
    "feature": {
      "type": "object",
      "required": ["type", "geometry", "properties"],
      "properties": {
        "type": { "const": "Feature" },
        "geometry": {
          "type": "object",
          "required": ["type", "coordinates"],
          "properties": {
            "type": { "const": "LineString" },
            "coordinates": {
              "type": "array",
              "minItems": 2,
              "items": {
                "type": "array",
                "minItems": 2,
                "maxItems": 2,
                "items": { "type": "number" }
              }
            }
          }
        },
        "properties": {
          "type": "object",
          "required": ["source", "length_m", "n_points"],
          "properties": {
            "source": { "enum": ["google", "mapillary", "kartaview"] },
            "length_m": { "type": "number", "minimum": 0 },
            "n_points": { "type": "integer", "minimum": 2 },
            "id": { "type": "string" },
            "capture_date": { "type": "string", "description": "YYYY-MM or ISO date" },
            "is_pano": { "type": "boolean", "description": "Mapillary 360 flag" },
            "pano_ids": { "type": "array", "items": { "type": "string" } },
            "sequence_id": { "type": "string" }
          }
        }
      }
    }
  }
}