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implied speeds far above a shark's), as the paper's Technical Validation instructs; the median metric is in any case robust to them." } ], "https://w3id.org/sciencelive/o/terms/hasDiscipline": [ { "@id": "http://www.wikidata.org/entity/Q7173" } ], "https://w3id.org/sciencelive/o/terms/hasMethodologyDescription": [ { "@value": "An open hidden Markov geolocation model (pangeo-fish) on a HEALPix (NESTED, level 9) state space spanning the documented NE-Pacific + Gulf-of-California species range (lon[-125,-106], lat[22,38]) — a baseline-free grid fixed by ecology, not by the GPE3/Argos tracks. The daily emission is the product of three independent factors: (1) an astronomical TWILIGHT emission that scores each cell by how well its modelled sunrise/sunset time (astropy) matches the tag's detected dawn/dusk times; (2) a TEMPERATURE emission matching the tag's external depth-temperature record against the GLORYS12V1 thetao field; and (3) a BATHYMETRY factor (GEBCO/ETOPO) that masks land and softly requires the seabed to be at least as deep as the animal's observed dives. Movement uses a land-barrier Gaussian transition (a custom kernel that forbids probability flow across land), so the model cannot move the animal over land. The Brownian diffusion sigma is fit per tag by maximum likelihood; daily positions are taken by maximum-a-posteriori decode and joined into a continuous, land-respecting track via a constrained shortest-path decode. Release and pop-up coordinates are the only spatial anchors. Each tag's track is compared to the held-out SPOT Argos fixes (quality classes 1/2/3) by median great-circle distance, with GPE3 scored identically for reference." } ], "https://w3id.org/sciencelive/o/terms/hasScopeDescription": [ { "@value": "The paper's computed daily PAT geolocations of juvenile white sharks. Specifically, whether the daily positions GPE3 produced from the light series can be recovered by an independent, fully open method, evaluated on the four sharks that carry a co-deployed SPOT tag, so that the held-out Argos satellite fixes serve as an independent positional referee. In scope: the daily geolocation track and its positional accuracy. Out of scope: the depth and temperature time series themselves, the tag hardware, and any non-geolocation data product. 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