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/44874/?format=api

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

{
    "ob_id": 44874,
    "uuid": "a2ac22ae97a34b51a81c8f53d414ec6b",
    "title": "ESA Precursors Climate Change Initiative (Precursors_cci): TROPOMI monthly mean level 3 tropospheric nitrogen dioxide (NO2) version 1.0 May 2018- December 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). https://doi.org/10.5194/essd-17-4627-2025\r\n\r\nTROPOspheric Monitoring Instrument (TROPOMI) global tropospheric nitrogen dioxide (NO2) spatiotemporally averaged per month over a standard grid from May 2018 to December 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 auxilliary 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.",
    "keywords": "TROPOMI,L3,NO2",
    "publicationState": "preview",
    "dataPublishedTime": null,
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "pending",
    "result_field": null,
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/12685/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/529/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "The L3 data were generated by spatiotemporally averaging operational TROPOMI L2 NO2 v2.3.1 data as part of the ESA CCI precursors project. Data was provided to CEDA for archival.",
    "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/45107/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/216545/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214964/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214965/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214966/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214967/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214968/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214969/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214963/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214970/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214971/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214972/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/214973/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/45265/?format=api",
    "procedureComputation": null,
    "permissions": [],
    "discoveryKeywords": []
}