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/37090/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 37090,
    "uuid": "540a4c4cdfa6497993bbfa7c3e3df51a",
    "title": "Stratospheric Nudging And Predictable Surface Impacts (SNAPSI): Reference state data",
    "abstract": "Reference state data derived from the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA5 reanalysis for the nudging experiments of the Stratospheric Nudging And Predictable Surface Impacts (SNAPSI) project. \r\nThese reference states are used to nudge the stratosphere towards a specified evolution in the ensemble forecasts carried out by the SNAPSI project.\r\nThe data contain: \r\n(a) lightly processed horizontal winds and temperatures from ERA5 spanning three case studies of sudden stratospheric warmings from 2018 to 2019 and \r\n(b) climatological horizontal winds and temperatures.",
    "keywords": "stratosphere, arctic, antarctic, stratospheric polar vortex, SNAPSI, SNAP, APARC",
    "publicationState": "citable",
    "dataPublishedTime": "2022-04-19T16:51:10",
    "doiPublishedTime": "2022-04-20T16:09:36",
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/37089/?format=api",
        "dataPath": "/badc/snap/data/post-cmip6/SNAPSI/SNAP/SNAPSI-REF",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 352016376483,
        "numberOfFiles": 114,
        "fileFormat": "netCDF"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/10250/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/1/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/1633/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6023/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/7562/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/7768/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/7770/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9616/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47592/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47593/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47594/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47595/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47596/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47597/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47598/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47599/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47600/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47601/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47602/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/47603/?format=api"
    ],
    "dataLineage": "Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).\r\nThe data is based on model-level output from ERA5, downloaded on a 1x1 degree horizontal grid. It has been lightly processed to compute the climatology and put in a format consistent with the SNAPSI data request.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/12112/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/37088/?format=api"
    ],
    "observationcollection_set": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177285/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177286/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177287/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177288/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177289/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177290/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177291/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177292/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/30236/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2567/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://creativecommons.org/licenses/by-sa/4.0/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}