{
 "type": "FeatureCollection",
 "name": "analysis_polygon",
 "crs": {
  "type": "name",
  "properties": {
   "name": "urn:ogc:def:crs:OGC:1.3/CRS84"
  }
 },
 "features": [
  {
   "type": "Feature",
   "properties": {
    "id": "path_corridor",
    "label_zh": "气象分析区域",
    "sublabel_zh": "运移路径两侧 4 km 缓冲区,面积约 200 km²",
    "buffer_km": 4,
    "area_km2": 200.1,
    "approximate": true,
    "note_zh": "由实测运移路径缓冲生成,不是 DEM 流向提取的真实汇水区。取 4 km 是因为所得面积与该集水区量级相当;实测 3 至 5 km 之间各诊断量差异在 1% 以内",
    "source_zh": "由 source_to_port_path.shp 缓冲生成",
    "label_en": "Meteorological analysis area",
    "sublabel_en": "A 4 km buffer around the runout path, about 200 km²",
    "note_en": "Generated by buffering the surveyed runout path. It is not a DEM-derived catchment. A 4 km radius was chosen because the resulting area matches the scale of this catchment. Between 3 and 5 km the diagnostics differ by less than 1%.",
    "source_en": "Buffered from source_to_port_path.shp"
   },
   "geometry": {
    "type": "Polygon",
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