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/31977/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 31977,
    "uuid": "6e61f79cb6b0457eb84edaffcf0aab3a",
    "title": "UKCP Global (60km) - European Circulation Indices",
    "abstract": "A set of European Climate Indices calculated from UKCP Global (60km) projections from 1900-2100 under RCP8.5 produced by the Met Office in 2018 including: \r\n\r\n1. Daily Atlantic jet stream latitude and strength \r\n\r\n2. Daily 'weather pattern' classification - time-series of 1-8 or 1-30 weather patterns which are based on a classification scheme for the large scale synoptic situation.\r\n\r\n3. Winter North Atlantic Oscillation (NAO) index - annual time series represents the seasonal mean NAO as the sea level pressure gradient between Gibraltar and Iceland.\r\n\r\nFurther information on this dataset and UKCP18 can be found in the documentation section.",
    "keywords": "Jet Stream,Europe, Circulation, Clustering, Weather types, Weather patterns, Weather regimes, North Atlantic Oscillation, NAO, UKCP Global, UKCP, UKCP18",
    "publicationState": "published",
    "dataPublishedTime": "2020-10-22T18:49:03",
    "doiPublishedTime": null,
    "updateFrequency": "asNeeded",
    "status": "ongoing",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/31978/?format=api",
        "dataPath": "/badc/ukcp18/data/land-indices",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 945593987,
        "numberOfFiles": 132,
        "fileFormat": "Data are NetCDF formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/8770/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/2719/?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/7795/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9042/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9043/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50510/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50515/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50516/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50517/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51184/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51185/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51186/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51187/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51190/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/62501/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/75840/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/91400/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92146/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92147/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92148/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92149/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92150/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92151/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/92152/?format=api"
    ],
    "dataLineage": "Data provided by the UK Met Office",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/31980/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141537/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141535/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141536/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141538/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141539/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141540/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141534/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141542/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/141541/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/31979/?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"
        }
    ]
}