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/45251/?format=api

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

{
    "ob_id": 45251,
    "uuid": "c4e5b5939c3240fb823896cefadbfe75",
    "title": "Nitrous oxide and carbon monoxide measurements from Ho Chi Minh City, Vietnam 2018-2019",
    "abstract": "Continuous in situ mole fractions measurements of nitrous oxide and carbon monoxide from instruments located on the roof of an 11-storey building (∼40m) at the Vietnam National University HCMC, University of Science campus in Ho Chi Minh City, Vietnam (10.7625°N, 106.6823°E).  These measurements were taken between October 2018 to March 2019 as part of the Two City study of Air Quality in Vietnam project NE/P014771/1.",
    "keywords": "nitrous oxide,carbon monoxide,vietnam",
    "publicationState": "citable",
    "dataPublishedTime": "2026-01-30T09:35:23",
    "doiPublishedTime": "2026-02-03T10:46:49",
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/45259/?format=api",
        "dataPath": "/badc/deposited2026/Vietnam_Two_Cities/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 2035001,
        "numberOfFiles": 2,
        "fileFormat": "BADC-CSV"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/12908/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/4991/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92766/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92767/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92768/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92769/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92770/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92771/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92772/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92773/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92774/?format=api"
    ],
    "dataLineage": "This data resources were collected by the project team - the NERC funded  project  enitited \"A Two City study of Air Quality in Vietnam\" - before archival at CEDA",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/13707/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/45252/?format=api"
    ],
    "observationcollection_set": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216532/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216511/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216512/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216513/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216514/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216515/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216516/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216510/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216517/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/45253/?format=api",
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2526/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": []
}