GET

Observation Instance

Get a list of Observation objects.

### Available end points:

- `/observations/` - Will list all Results in the database
- `/observations.json` - Will return all Results in json format. This can
also be achieved by using the accept header. `application/json`
- `/observations/<object_id>/` - Returns Results object with that id

### Available Methods:

- `GET`
- `HEAD`

### Available filters:

- `title`
- `uuid`
- `keywords`
- `status`
- `result_field`
- `discoveryKeywords`
- `updateFrequency`
- `nonGeographicFlag`
- `publicationState`
- `permissions`

### How to use filters:

These filters can be used like django query filters using __ for related model relationships.

- `/observations/?uuid=d594d53df2612bbd89c2e0e770b5c1a0`
- `/observations/?status=completed`
- `/observations/?results_field__dataPath__startswith=/neodc/esacci`
- `/observations/?discoveryKeywords__name=ESACCI`
- `/observations/?nonGeographicFlag=True`

Filters can be stacked to build an 'AND' relationship. E.g.

- `/observations/?publicationState__in=published,citable&nonGeographicFlag=True`
- `/observations/?publicationState__in=published,citable&discoveryKeyword__name=NDGO0003`

GET /api/v2/observations/44909/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 44909,
    "uuid": "559901afef54425f8e755f9305d0af3a",
    "title": "ESA Precursors Climate Change Initiative (Precursors_cci): IASI/Metop-A NH3 L3 product, version 4R",
    "abstract": "This long-term dataset contains monthly Level 3 (L3) gridded ammonia (NH3) total column data derived from IASI (Infrared Atmospheric Sounding Interferometer) measurements onboard Metop-A (Meteorological operational satellite-A) data produced as part of the European Space Agency's (ESA) Climate Change Initiative (CCI) Precursors for aerosols and ozone project. The temporal range of this dataset is October 2007 to October 2021. Full documentation can be found at the project website: https://climate.esa.int/en/projects/precursors-for-aerosols-and-ozone/.\r\n\r\nThe version number is 4.0.1R. Data are available in NetCDF format.\r\n\r\nThis dataset forms part of the ESA Precursors Climate Change Initiative (Precursors_cci): Precursors IASI NH3 L3 data products v4R. doi:10.5285/463862326d574951bea52527f9df397d. https://dx.doi.org/10.5285/463862326d574951bea52527f9df397d",
    "keywords": "ESA, CCI, Precursors, Ammonia, aerosol precursors, satellite, observation, atmosphere, ammonia, NH3, level 3, total column, agriculture, fertilizers, livestock, biomass burning, industrial emissions, air quality, IASI",
    "publicationState": "published",
    "dataPublishedTime": "2026-02-19T10:39:57",
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/45299/?format=api",
        "dataPath": "/neodc/esacci/precursors/data/IASI_NH3_L3/v4R/METOP-A/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 16232040881,
        "numberOfFiles": 170,
        "fileFormat": "netcdf"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/12913/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/529/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51186/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51187/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/62501/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92775/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92776/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92777/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92778/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92779/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92780/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92781/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92782/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92783/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92784/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92785/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92786/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92787/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92788/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92789/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92790/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92791/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92792/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92793/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92794/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92795/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92796/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92797/?format=api"
    ],
    "dataLineage": "Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/45106/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/44908/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/45107/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215156/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215157/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215158/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215159/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215160/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215161/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215162/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/215163/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216560/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216561/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/45270/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2674/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/esacci_precursors_for_aerosols_and_ozone_terms_and_conditions.pdf",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": []
}