{"database": "catalogue", "table": "datasets", "rows": [["data.gouv.fr", "https://www.data.gouv.fr/datasets/6a383d97db19b33e466e432b", 1, "Palmar\u00e8s auditable des pr\u00e9visions sargasses \u2014 Antilles fran\u00e7aises", "Comparaison quotidienne entre la pr\u00e9vision sargasses \u00e9mise (J+1 \u00e0 J+6, fig\u00e9e \u00e0 l'\u00e9mission dans une archive append-only) et l'observation satellite r\u00e9elle \u00e0 l'\u00e9ch\u00e9ance, pour les plages de Martinique et de Guadeloupe.\n\nLe jeu de donn\u00e9es fournit le **taux de justesse** du statut (propre / mod\u00e9r\u00e9 / \u00e0 \u00e9viter) par horizon et par r\u00e9gime (saison calme / arriv\u00e9es), le **MAE de l'indice AFAI** et le **taux de fausse alerte**. Recalcul\u00e9 \u00e0 chaque mise \u00e0 jour de l'archive ; aucun chiffre n'est r\u00e9tro-ajustable.\n\n**M\u00e9thode** : Alternative Floating Algae Index (AFAI) sur imagerie Sentinel-3 OLCI via Copernicus Marine / ERDDAP ; seuils NOAA SIR (Wang & Hu 2016).\n\n**Fiche, m\u00e9thodologie et visualisation** : [Palmar\u00e8s auditable des pr\u00e9visions sargasses](https://sargasses-martinique.com/recherche/)\n\nLicence : CC BY 4.0.", "https://www.data.gouv.fr/datasets/palmares-auditable-des-previsions-sargasses-antilles-francaises", "Yacov Assaraf", "http://www.opendefinition.org/licenses/cc-by", "2026-06-21T19:37:59.069000", "2026-06-21T20:08:36.078000", "[\"sargasses\"]", "[]", "https://www.data.gouv.fr/datasets/6a383d97db19b33e466e432b", "6a383d97db19b33e466e432b"]], "columns": ["portal_id", "key", "harvest_id", "title", "description", "landing_page", "publisher", "licence", "issued", "modified", "keywords", "themes", "uri", "identifier"], "primary_keys": ["portal_id", "key"], "primary_key_values": ["data.gouv.fr", "https://www.data.gouv.fr/datasets/6a383d97db19b33e466e432b"], "units": {}, "query_ms": 4.082916000697878, "source": "Dateno, DataPortals.org, data.europa.eu, opendatArchives, and each portal's DCAT catalogue", "source_url": "https://github.com/datenoio/dataportals-registry", "license": "CC BY 4.0 (portal directory, derived from Dateno); dataset metadata as each portal publishes it", "license_url": "https://creativecommons.org/licenses/by/4.0/"}