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/7449/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 7449,
    "uuid": "3bee278d54ecee4c771c77d2f064b71e",
    "title": "QPENSO: picontrol experiment monthly mean ocean and atmosphere model fields measurements",
    "abstract": "Model simulations undertaken by the Quantifying variability of the El Nino Southern Oscillation on adaptation-relevant time scales using a novel palaeodata-modelling approach (QPENSO) project. These are coupled ocean-atmosphere experiments with a modified version of the HadCM3 (UM version 4.5) climate model. The model has been modified to include stable isotopes of oxygen in both the ocean and atmosphere sub-models, after Tindall et al., 2009. The simulations are grouped into two experiments: 1) 'picontrol', comprising a single 750 year duration unforced pre-industrial boundary condition simulation; 2) 'forced', comprising a suite of six historical simulations of the interval 1160-1360 AD and including changes in solar, volcanic and greenhouse gas forcing. The six simulations represent an initial-condition ensemble over this interval.",
    "keywords": "NERC, QPENSO, el nino, ENSO, paleo, model, picontrol, simulation, oxygen",
    "publicationState": "published",
    "dataPublishedTime": "2013-09-19T16:27:16",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/7450/?format=api",
        "dataPath": "/badc/nerc-rm2010/data/qpenso/picontrol",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 9967510463,
        "numberOfFiles": 6,
        "fileFormat": "NetCDF"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3322/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/524/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/4385/?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/9045/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51157/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/51158/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57181/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57182/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57183/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57184/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57185/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57186/?format=api"
    ],
    "dataLineage": "Data created by QPENSO project team based in the School of Geosciences, University of Edinburgh. The data were transferred to the BADC at the end of the project.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/4830/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/8726/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/7451/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/7448/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31189/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31188/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31193/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31187/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31190/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31191/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31192/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/53050/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/31194/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/7452/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2543/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "registered",
            "accessRoles": null,
            "label": "registered: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/missing_licence.pdf",
            "licenceClassifications": "unstated"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}