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/41352/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 41352,
    "uuid": "3fa0152b55fd4a3b8357fdfcfc55f45d",
    "title": "NOx and O3 gas data from SASSO project - Version 0",
    "abstract": "This dataset contains data from the University of Manchester nitrogen oxides (NOx) monitor and ozone (O3) monitor collected at the University of Manchester, between January and February 2020 as part of the Soot Aerodynamic Size Selection for Optical properties (SASSO) project. The NOx and O3 concentrations inside the chamber were measured in real time during the experiment. \r\n\r\nNO, NO2, and NOx concentrations were measured using the NOx analyzer (Model 42i, Thermo Scientific), while O3 concentration was measured using the O3 analyzer (Model 49C, Thermo Scientific). These data reveal the conditions for each experiment.\r\n\r\nThis version 0 dataset contains NO, NO2, NOx and O3 concentration. The NOx monitor and O3 monitor are operated by University of Manchester scientists.",
    "keywords": "NOX, O3, SASSO",
    "publicationState": "published",
    "dataPublishedTime": "2024-08-01T15:57:38",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/41625/?format=api",
        "dataPath": "/badc/deposited2024/SASSO/SASSO_MAN_GAS_LABdata",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 440773,
        "numberOfFiles": 5,
        "fileFormat": "Data are BADC-CSV formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/11496/?format=api",
    "geographicExtent": null,
    "nonGeographicFlag": true,
    "phenomena": [],
    "dataLineage": "Data were produced by the SASSO project 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/38101/?format=api"
    ],
    "observationcollection_set": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201312/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201313/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201314/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201315/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201316/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201317/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/202885/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/201319/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/43067/?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": []
}