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/27729/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 27729,
    "uuid": "8f8eab18b07e420a9b7230d86ed172fe",
    "title": "P25-Future: Future 25km regional pan-Africa data",
    "abstract": "The future 25km regional pan-Africa (P25: Present) data were produced using the Met Office's Unified Model, the IMPALA (Improving Model Processes for African cLimAte) project ran a ten year timeslice simulation that is representative of end the 21st century (2095-2105) using a 30-year averaged sea surface temperature (SST) anomaly (2085-2115 relative to 1975-2005). Parameters include (but not limited to); near-surface air temperature, outgoing longwave radiation, surface latent heat flux and surface sensible heat flux. The NERC funded IMPALA project is within the Future Climate for Africa (FCFA) programme.\r\n\r\nHere a subset of variables of the data produced is provided in NetCDF format for community reuse, variables are available at a range of temporal frequencies.",
    "keywords": "P25, future, IMPALA, FCFA",
    "publicationState": "published",
    "dataPublishedTime": "2019-10-14T14:01:29",
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/27735/?format=api",
        "dataPath": "/badc/impala/data/param-25km/future",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 240832795579,
        "numberOfFiles": 32522,
        "fileFormat": "Data are provided in NetCDF formats."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/7417/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/2312/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6023/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/19043/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50498/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50512/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50542/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50543/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52993/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54154/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54155/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54156/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54157/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54158/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54159/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54160/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54161/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54162/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54163/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54164/?format=api"
    ],
    "dataLineage": "The data were passed from the project team to the Centre for Environmental Data Analysis for archival and distribution.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/26912/?format=api"
    ],
    "observationcollection_set": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115905/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115906/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115907/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115909/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115910/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115912/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115914/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115913/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115911/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115916/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115917/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/148583/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/28036/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2522/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "registered",
            "accessRoles": null,
            "label": "registered: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}