{
 "schema": "heimdall-observation/1",
 "id": "obs-0002",
 "slug": "diomede-islands-bering-strait-2024-2025",
 "status": "approved",
 "publish_date": "2026-09-25",
 "title": "Diomede Islands, Bering Strait, November 2024 and March 2025",
 "summary": "Two radar acquisitions of the same 48 by 27 km window, 108 days apart, record the strait's transition from open water in November to fractured pack ice in March.",
 "place": {
  "name": "Diomede Islands, Bering Strait",
  "lat": 65.76,
  "lon": -168.95
 },
 "layout": "diptych",
 "frames": [
  {
   "acquired": "2024-11-16",
   "label": "2024-11-16",
   "resolution_m": 25,
   "scenes": [
    "Sentinel-1A IW GRDH VV, relative orbit 161 descending, 2024-11-16"
   ],
   "avif": "/media/plate-2024-11-16.f65ab34d.avif",
   "webp": "/media/plate-2024-11-16.89591fc3.webp",
   "width": 960,
   "height": 540,
   "alt": "Satellite radar image of the Diomede Islands in the Bering Strait on 16 November 2024, surrounded by open water.",
   "print_avif": "/media/print-obs-0002-1.2f8e8de2.avif",
   "print_webp": "/media/print-obs-0002-1.bd590bbf.webp",
   "print_width": 1200,
   "print_height": 760
  },
  {
   "acquired": "2025-03-04",
   "label": "2025-03-04",
   "resolution_m": 25,
   "scenes": [
    "Sentinel-1A IW GRDH VV, relative orbit 161 descending, 2025-03-04"
   ],
   "avif": "/media/plate-2025-03-04.862ea8e6.avif",
   "webp": "/media/plate-2025-03-04.1941b4d7.webp",
   "width": 960,
   "height": 540,
   "alt": "The same area on 4 March 2025, with the islands surrounded by fractured pack ice.",
   "print_avif": "/media/print-obs-0002-2.60d5bad1.avif",
   "print_webp": "/media/print-obs-0002-2.2049ebd0.webp",
   "print_width": 1200,
   "print_height": 786
  }
 ],
 "sensor": {
  "source": "Sentinel-1",
  "product": "Sentinel-1A interferometric wide swath, ground-range detected, VV polarisation",
  "catalog": "Microsoft Planetary Computer STAC, collection sentinel-1-grd"
 },
 "modality": "sar",
 "themes": [
  "ice-and-snow",
  "islands",
  "coasts"
 ],
 "lane": "earth-systems",
 "region": {
  "country": "united-states",
  "admin": "Alaska"
 },
 "occasions": [
  "arctic-sea-ice-maximum"
 ],
 "overlays": [],
 "rights": {
  "imagery": "Contains modified Copernicus Sentinel data 2024, 2025. Copernicus Sentinel data is free, full, and open.",
  "overlay": "",
  "render": "Heimdall Research",
  "credit": "Contains modified Copernicus Sentinel data 2024, 2025."
 },
 "ctas": {
  "print": true,
  "analysis": true
 },
 "related": {
  "observations": [],
  "field_notes": [],
  "datasets": [
   "arctic-window"
  ]
 },
 "path": "/observations/diomede-islands-bering-strait-2024-2025/",
 "acquired_text": "2024-11-16 and 2025-03-04",
 "resolution_text": "25 m ground sample distance",
 "scene_ids": [
  "Sentinel-1A IW GRDH VV, relative orbit 161 descending, 2024-11-16",
  "Sentinel-1A IW GRDH VV, relative orbit 161 descending, 2025-03-04"
 ],
 "url": "https://heimdallresearch.com/observations/diomede-islands-bering-strait-2024-2025/",
 "map": "https://heimdallresearch.com/media/maps/obs-0002.e4a4f986.svg",
 "author": "Heimdall Research"
}