{
 "method": "danger-report model (gradient boosting on hazard field + soundings + coast + elevation + imagery + radar + gravity; year-split validated AUC 0.93) applied on a 500 m grid to chart-safe water within 6 km of a sounding; boxes ranked by expected reported-danger area per ship-day",
 "relevance": "within 30 km of the Churchill route or an NRCan shipping route / Arctic sea route, or 15 km of a sealift community; inland lakes excluded",
 "top20": [
  {
   "lon": -83.5,
   "lat": 64.0,
   "area_km2": 118,
   "cells": 1053,
   "expected_reports_km2": 26.74,
   "ship_days": 2.9,
   "reports_per_ship_day": 9.083
  },
  {
   "lon": -78.5,
   "lat": 64.5,
   "area_km2": 55,
   "cells": 512,
   "expected_reports_km2": 7.96,
   "ship_days": 1.4,
   "reports_per_ship_day": 5.767
  },
  {
   "lon": -94.0,
   "lat": 69.0,
   "area_km2": 31,
   "cells": 430,
   "expected_reports_km2": 4.26,
   "ship_days": 0.8,
   "reports_per_ship_day": 5.506
  },
  {
   "lon": -92.0,
   "lat": 63.5,
   "area_km2": 58,
   "cells": 509,
   "expected_reports_km2": 6.85,
   "ship_days": 1.5,
   "reports_per_ship_day": 4.698
  },
  {
   "lon": -65.5,
   "lat": 62.5,
   "area_km2": 138,
   "cells": 1112,
   "expected_reports_km2": 14.63,
   "ship_days": 3.4,
   "reports_per_ship_day": 4.254
  },
  {
   "lon": -69.0,
   "lat": 63.5,
   "area_km2": 175,
   "cells": 1516,
   "expected_reports_km2": 16.47,
   "ship_days": 4.4,
   "reports_per_ship_day": 3.775
  },
  {
   "lon": -91.0,
   "lat": 63.0,
   "area_km2": 289,
   "cells": 2459,
   "expected_reports_km2": 24.12,
   "ship_days": 7.2,
   "reports_per_ship_day": 3.335
  },
  {
   "lon": -59.0,
   "lat": 65.5,
   "area_km2": 90,
   "cells": 904,
   "expected_reports_km2": 6.13,
   "ship_days": 2.2,
   "reports_per_ship_day": 2.726
  },
  {
   "lon": -91.5,
   "lat": 63.5,
   "area_km2": 143,
   "cells": 1241,
   "expected_reports_km2": 9.36,
   "ship_days": 3.6,
   "reports_per_ship_day": 2.611
  },
  {
   "lon": -91.5,
   "lat": 62.5,
   "area_km2": 580,
   "cells": 4699,
   "expected_reports_km2": 37.49,
   "ship_days": 14.5,
   "reports_per_ship_day": 2.585
  },
  {
   "lon": -58.5,
   "lat": 65.5,
   "area_km2": 268,
   "cells": 2700,
   "expected_reports_km2": 16.83,
   "ship_days": 6.7,
   "reports_per_ship_day": 2.509
  },
  {
   "lon": -92.5,
   "lat": 62.5,
   "area_km2": 75,
   "cells": 614,
   "expected_reports_km2": 4.64,
   "ship_days": 1.9,
   "reports_per_ship_day": 2.469
  },
  {
   "lon": -68.5,
   "lat": 63.5,
   "area_km2": 301,
   "cells": 2603,
   "expected_reports_km2": 17.75,
   "ship_days": 7.5,
   "reports_per_ship_day": 2.359
  },
  {
   "lon": -94.0,
   "lat": 61.0,
   "area_km2": 481,
   "cells": 3530,
   "expected_reports_km2": 27.02,
   "ship_days": 12.0,
   "reports_per_ship_day": 2.248
  },
  {
   "lon": -63.5,
   "lat": 70.5,
   "area_km2": 60,
   "cells": 950,
   "expected_reports_km2": 3.29,
   "ship_days": 1.5,
   "reports_per_ship_day": 2.178
  },
  {
   "lon": -68.5,
   "lat": 63.0,
   "area_km2": 388,
   "cells": 3312,
   "expected_reports_km2": 18.85,
   "ship_days": 9.7,
   "reports_per_ship_day": 1.943
  },
  {
   "lon": -92.0,
   "lat": 62.5,
   "area_km2": 296,
   "cells": 2407,
   "expected_reports_km2": 14.28,
   "ship_days": 7.4,
   "reports_per_ship_day": 1.932
  },
  {
   "lon": -59.5,
   "lat": 65.0,
   "area_km2": 783,
   "cells": 7671,
   "expected_reports_km2": 37.4,
   "ship_days": 19.6,
   "reports_per_ship_day": 1.911
  },
  {
   "lon": -60.0,
   "lat": 65.5,
   "area_km2": 579,
   "cells": 5868,
   "expected_reports_km2": 27.42,
   "ship_days": 14.5,
   "reports_per_ship_day": 1.893
  },
  {
   "lon": -64.5,
   "lat": 70.5,
   "area_km2": 65,
   "cells": 1011,
   "expected_reports_km2": 3.0,
   "ship_days": 1.6,
   "reports_per_ship_day": 1.857
  }
 ],
 "total": {
  "area_km2": 4973,
  "ship_days": 124,
  "cost_low_MCAD": 13,
  "cost_high_MCAD": 23
 },
 "n_boxes": 1205
}