{
 "schema": "Each site: slug (data file names), name, region, country, club/clubShort/source (whose site guide the metadata comes from), lat/lon of take-off (WGS84), takeoffAmsl_ft, relief_ft, windFrom [from°, to°] working arc (clockwise), strengthBand_mph, workingWind, character, hazards. Terrain/landcover per slug under data/terrain and data/landcover (scripts/fetch-terrain.mjs, scripts/fetch-surface.mjs).",
 "sites": [
  {
   "slug": "devils-dyke",
   "name": "Devil's Dyke",
   "region": "South Downs, West Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.88572,
   "lon": -0.21278,
   "gridRef": "TQ 258 111",
   "takeoffAmsl_ft": 700,
   "relief_ft": 500,
   "windFrom": [
    292.5,
    360
   ],
   "aspect": 330,
   "workingWind": "WNW – N",
   "strengthBand_mph": [
    10,
    22
   ],
   "character": "Half-mile NW ridge leading to a north-facing bowl with a NE spur, then a 2-mile north ridge toward Truleigh Hill. One of the classic South Downs sites.",
   "hazards": "Sea-breeze can encroach from behind the hill causing abrupt, severe turbulence. In NNE the take-off sits in wind-shadow with rotor at the rear of the paddock. Westerlies give very turbulent air off the bowls; the valley behind take-off holds rotor and sink."
  },
  {
   "slug": "firle",
   "name": "Firle",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.83478,
   "lon": 0.08719,
   "gridRef": "TQ 468 059",
   "takeoffAmsl_ft": 540,
   "relief_ft": 320,
   "windFrom": [
    315,
    22.5
   ],
   "aspect": 355,
   "workingWind": "NW – NNE",
   "strengthBand_mph": [
    9,
    20
   ],
   "character": "North-facing bowl giving on to the northerly Firle ridge. A friendly, popular training-friendly site in the right conditions.",
   "hazards": "Trees on the slope generate turbulence and dangerous sink near the fence. Steep wind gradient on take-off. Bowl geometry creates a venturi — wind can appear more aligned than it is, with serious rotor low in the bowl when off-axis, especially strong NE."
  },
  {
   "slug": "mount-caburn",
   "name": "Mount Caburn",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.86153,
   "lon": 0.05097,
   "gridRef": "TQ 443 088",
   "takeoffAmsl_ft": 500,
   "relief_ft": 420,
   "windFrom": [
    180,
    225
   ],
   "aspect": 202,
   "workingWind": "S – SW",
   "strengthBand_mph": [
    10,
    20
   ],
   "character": "South-west facing dome with a bowl beyond, standing free 2 km SE of Lewes. A distinctive isolated hill with a small but reliable lift band.",
   "hazards": "Often roughened by the sea breeze. Severe rotor behind the western ridge — carry ample height. Wind accelerates around the south/east sides; venturi in the bowl can produce 180° shifts over the landing field."
  },
  {
   "slug": "beachy-head",
   "name": "Beachy Head",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.73994,
   "lon": 0.25314,
   "gridRef": "TV 591 958",
   "takeoffAmsl_ft": 530,
   "relief_ft": 370,
   "windFrom": [
    112.5,
    180
   ],
   "aspect": 150,
   "workingWind": "ESE – S",
   "strengthBand_mph": [
    10,
    20
   ],
   "character": "South-east facing bowl with additional SSE-facing chalk cliffs above the sea, 2 miles SW of Eastbourne.",
   "hazards": "Serious turbulence when lapse rates are poor, especially in summer. Dangerous rotor behind the cliffs in southerly winds. No safe bottom landing below the main cliffs — slippery rocks and limited beach."
  },
  {
   "slug": "ditchling",
   "name": "Ditchling Beacon",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.90289,
   "lon": -0.12019,
   "gridRef": "TQ 325 132",
   "takeoffAmsl_ft": 720,
   "relief_ft": 550,
   "windFrom": [
    337.5,
    360
   ],
   "aspect": 350,
   "workingWind": "N – NNW",
   "strengthBand_mph": [
    10,
    22
   ],
   "character": "North-facing bowl with ridges running 7 km east to Offham and 2 km west to the Clayton windmills. One of the highest points on the South Downs.",
   "hazards": "Trees on the lower slopes create a steep wind gradient with lee turbulence. Strong winds produce rotor behind the trig point; NE winds can give site-wide rotor on the eastern side."
  },
  {
   "slug": "bo-peep",
   "name": "Bo Peep",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.82044,
   "lon": 0.12867,
   "gridRef": "TQ 500 043",
   "takeoffAmsl_ft": 600,
   "relief_ft": 300,
   "windFrom": [
    22.5,
    67.5
   ],
   "aspect": 45,
   "workingWind": "NNE – ENE",
   "strengthBand_mph": [
    9,
    20
   ],
   "character": "North-east ridge system with multiple bowls running west to a 700 ft trig point, and a northerly ridge past Firle. Superb soaring potential along the extended ridge.",
   "hazards": "Trees in front of the Bostal Down launch give severe turbulence in strong winds. Marked venturi in the quarry distorts wind assessment; rotor behind the quarry in NNE."
  },
  {
   "slug": "high-and-over",
   "name": "High & Over",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.78794,
   "lon": 0.14203,
   "gridRef": "TQ 510 011",
   "takeoffAmsl_ft": 250,
   "relief_ft": 220,
   "windFrom": [
    67.5,
    135
   ],
   "aspect": 90,
   "workingWind": "ENE – SE",
   "strengthBand_mph": [
    9,
    18
   ],
   "character": "A small, steep, tree-covered bowl facing due east over the Cuckmere river valley, south of Alfriston.",
   "hazards": "A fully recirculating rotor can set up over the car park. Fast changes in wind direction and strength with gusty thermals. Often sink over the trees in the bowl. Not a site for inexperienced pilots."
  },
  {
   "slug": "newhaven-cliffs",
   "name": "Newhaven Cliffs",
   "region": "South Downs, East Sussex",
   "country": "GB",
   "club": "Southern Hang Gliding Club",
   "clubShort": "SHGC",
   "source": "https://shgc.org.uk/siteguide",
   "lat": 50.78206,
   "lon": 0.05014,
   "gridRef": "TQ 446 000",
   "takeoffAmsl_ft": 180,
   "relief_ft": 160,
   "windFrom": [
    157.5,
    202.5
   ],
   "aspect": 180,
   "workingWind": "SSE – SSW",
   "strengthBand_mph": [
    10,
    20
   ],
   "character": "South-facing and SSW chalk sea-cliff runs. Coastal soaring where lift depends on the air–sea temperature differential as much as wind strength.",
   "hazards": "Rotor behind the cliff for almost its full extent where the land slopes away. Venturi and wind-shadow at the point in easterly components. The airflow at Brighton Marina is very turbulent — stay clear of the eastern arm."
  }
 ]
}