Observation Instance

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{
    "ob_id": 44817,
    "uuid": "6181ff81c7dc4ab2a492c8f53f58df52",
    "title": "Deformation, Strains, and Velocities for the Tibetan Plateau from Sentinel-1 InSAR, GNSS, and Levelling Data, version 1",
    "abstract": "This dataset provides velocity and strain rate fields for the Tibetan Plateau derived from Sentinel-1 Interferometric Synthetic Aperture Radar (InSAR), Global Navigation Satellite System (GNSS), and levelling data. Interferograms in GeoTIFF format at ~100 m resolution are available from the Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics - Looking Inside the Continents from Space InSAR (COMET-LiCSAR) portal (https://comet.nerc.ac.uk/comet-lics-portal/) Using the Looking Inside the Continents from Space with Small Baseline Subset (LiCSBAS) approach, line-of-sight displacement time series and average velocities at ~1 km resolution are inverted, applying corrections for troposphere, ionosphere, Earth tides, and plate motions. Also compiling GNSS velocities and levelling observations from published studies. Following the velmap methodology, a unified coarse 3D velocity field is obtained that fits the GNSS, levelling, and InSAR data. From this, mosaics of ascending and descending line-of-sight velocities in a Eurasia reference frame. Inverting pixel-by-pixel for the east-west and vertical velocities directly from the referenced line-of-sight velocities, using the north–south velocities from the coarse 3D velocity model as a constraint. Strain and rotation rates are calculated from the horizontal gradients of the median-filtered east-west velocities at InSAR resolution and the north-south velocities from the coarse velocity model. Further details are provided in Wright et al. (2025, Science).\r\n\r\nThe directory overview for this dataset are given below:\r\nENU_vels/\r\nEast-west, north-south, and vertical velocity fields, along with their associated uncertainties.\r\n \r\ngeoreferenced_los_vels/\r\nLine-of-sight (LOS) velocities in a Eurasia-fixed reference frame defined by GNSS\r\n \r\nGNSS_levelling_data/\r\nCompiled GNSS velocities and levelling rates from published studies.\r\n \r\nLiCSBAS_los_vels/\r\nOriginal LOS velocities and displacement time series derived from LiCSBAS processing.\r\n \r\nstrain_rates/\r\nComponents of the horizontal velocity gradient tensor, second invariant, maximum shear, dilatation, and vorticity.\r\n \r\nvelmap_strain_rates/\r\nStrain rates calculated from velmap.\r\n\r\nvelmap_vels/\r\nCoarse 3D velocity model derived from velmap.",
    "keywords": "COMET, Sentinel 1",
    "publicationState": "citable",
    "dataPublishedTime": "2025-08-21T13:35:57",
    "doiPublishedTime": "2025-08-21T13:53:09",
    "updateFrequency": "",
    "status": "completed",
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        "dataPath": "/neodc/comet/publications_data/Wright_etal_2025_Tibet/v1.0",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 44692558075,
        "numberOfFiles": 7590,
        "fileFormat": "These data are provided in GeoTiff format."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/12632/?format=api",
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    "nonGeographicFlag": false,
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    "dataLineage": "Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).",
    "removedDataTime": null,
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    "language": "English",
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