{
  "center_lat_lon": [
    42.966901,
    19.528321
  ],
  "half_side_m": 2000.0,
  "grid_shape": [
    134,
    134
  ],
  "grid_step_m_approx": 30.0,
  "bounds_lon_lat": [
    19.503768511598835,
    42.948904383363924,
    19.55287348840116,
    42.984897616636076
  ],
  "source": "Mapzen Terrain Tiles on AWS, Terrarium zoom 12",
  "source_urls": [
    "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/12/2269/1505.png",
    "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/12/2270/1505.png"
  ],
  "method": "nearest Terrarium sample at nominal 30 m grid; centered finite-difference slope; valley position = mean neighborhood elevation minus local elevation; index = 0.55*clipped(1-slope/30) + 0.45*clipped((valley+10)/45)",
  "limitations": [
    "terrain-only clue, not groundwater probability or well yield",
    "original regional DEM effective resolution and vertical accuracy vary by source",
    "edge neighborhood truncated; slope gradients near grid edge less reliable",
    "no Sentinel, geology, wells or field validation included"
  ],
  "source_access_date_utc": "2026-09-23",
  "water_features": "OpenStreetMap map API snapshot 2026-09-23; 34 features, unverified"
}