Observation Instance – Django REST framework

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/45686/?format=api

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 45686,
    "uuid": "0065ceb2b1ff4f40b2a1e961faef2b77",
    "title": "ESA Precursors for Aerosols and Ozone Climate Change Initiative (Precursors_cci): OMI monthly mean level 3 tropospheric nitrogen dioxide (NO2) version 1.0 October 2004 - March 2021",
    "abstract": "The dataset was produced as part of the European Space Agency (ESA) Climate Change Initiative+ (CCI+) precursors for aerosols and ozone project by the Royal Netherlands Meteorological Institute (KNMI).\r\n\r\nOzone Monitoring Instrument (OMI) global tropospheric nitrogen dioxide (NO2) spatiotemporally averaged per month over a standard grid from October 2004 to March 2021. The dataset is provided in four different spatial resolutions: 0.2x0.2 (900x1800 grid cells), 0.5x0.5 (360x720), 1x1 (180x360), 2x2.5 (91x144) and includes auxiliary variables (e.g. cloud and surface properties, propagated level 3 uncertainties, averaging kernels). The data are provided in monthly netCDF files for each spatial resolution. doi: https://doi.org/10.21944/cci-no2-omi-l3",
    "keywords": "cci,no2,L3,nitrogen dioxide,omi",
    "publicationState": "published",
    "dataPublishedTime": "2026-07-15T09:13:58",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://catalogue.ceda.ac.uk/api/v2/observations/46117/?format=api",
        "dataPath": "/neodc/esacci/precursors/data/OMI_NO2_L3/v1.0/monthly/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 102343832326,
        "numberOfFiles": 793,
        "fileFormat": "netcdf"
    },
    "timePeriod": "https://catalogue.ceda.ac.uk/api/v2/times/13073/?format=api",
    "geographicExtent": "https://catalogue.ceda.ac.uk/api/v2/bboxes/5118/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/51157/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/51158/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/62501/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92991/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92992/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92993/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92994/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92995/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92996/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92997/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92998/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/92999/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93000/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93001/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93002/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93003/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93004/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93005/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93006/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93007/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93008/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93009/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93010/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93011/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93012/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93013/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93014/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93015/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93016/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93930/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93931/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/phenomona/93932/?format=api"
    ],
    "dataLineage": "Data were generated by spatiotemporally averaging operational OMI L2 NO2 QA4ECV version 1 data.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://catalogue.ceda.ac.uk/api/v2/projects/45106/?format=api"
    ],
    "observationcollection_set": [
        "https://catalogue.ceda.ac.uk/api/v2/observationcollections/45107/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://catalogue.ceda.ac.uk/api/v2/rpis/220292/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218358/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218359/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218360/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218361/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218362/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218363/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218357/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218364/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218365/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218366/?format=api",
        "https://catalogue.ceda.ac.uk/api/v2/rpis/218367/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://catalogue.ceda.ac.uk/api/v2/composites/46089/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://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": [
        {
            "ob_id": 1140,
            "name": "ESACCI"
        }
    ]
}