{
  "annotation_id": "7934dda1-6405-4226-8e6e-216f2cd1ce03",
  "date_created": "2026-03-02T18:00:50.434000Z",
  "date_modified": "2026-03-02T18:00:50.434000Z",
  "file_hash": "bcfd4f6a4b5a537def436b31d71ba80dac38bc84529b2722bb540677c08b64cd",
  "private": false,
  "record": {
    "abstract": "We report on the retrieval of directional sea surface roughness, in terms of\nits full directional mean square slope (including direction and isotropy), from\nGlobal Navigation Satellite System Reflections (GNSS-R) Delay-Doppler-Map (DDM)\ndata collected during an experimental flight at 1 km altitude. This study\nemphasizes the utilization of the entire DDM to more precisely infer ocean\nroughness directional parameters. In particular, we argue that the DDM exhibits\nthe impact of both roughness and scatterer velocity. Obtained estimates are\nanalyzed and compared to co-located Jason-1 measurements, ECMWF numerical\nweather model outputs and optical data.",
    "arxiv_id": "physics/0407037",
    "authors": [
      "O. Germain",
      "G. Ruffini",
      "F. Soulat",
      "M. Caparrini",
      "B. Chapron",
      "P. Silvestrin"
    ],
    "categories": [
      "physics.ao-ph",
      "physics.ins-det"
    ],
    "doi": "10.1029/2004GL020991",
    "title": "The Eddy Experiment: GNSS-R speculometry for directional sea-roughness   retrieval from low altitude aircraft",
    "url": "https://arxiv.org/abs/physics/0407037"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e1fb85f9-2a37-4349-ae1c-da80e08d4be5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}