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/21775/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 21775,
    "uuid": "0719a31ab2484b56813db071ef30e5d2",
    "title": "WCRP CMIP5: The MIROC team MIROC5 model output for the sstClim4xCO2 experiment",
    "abstract": "WCRP CMIP5: The MIROC team MIROC5 model output for the SST Climatology With 4XCO2 Forcing (sstClim4xCO2) experiment. These data cover the following realms: aerosol, atmos, land and landIce; at the following frequencies: day, fx, mon and monClim. The runs included the ensemble members: r0i0p0 and r1i1p1.\n\nThe WCRP Coupled Model Intercomparison Project, Phase 5 (CMIP5), was a global climate model intercomparison project, coordinated by PCMDI (Program For Climate Model Diagnosis and Intercomparison) on behalf of the World Climate Research Program (WCRP) and provided input for the Intergovernmental Panel on Climate Change (IPCC) 5th Assessment Report (AR5).\n\nThe MIROC team consisted of the following agencies: Atmosphere and Ocean Research Institute (AORI) and Japan Agency for Marine-Earth Science and Technology (JAMSTEC).",
    "keywords": "CMIP5, CMIP, WCRP, climate change, MIROC, MIROC5, sstClim4xCO2, aerosol, atmos, land, landIce, day, fx, mon, monClim",
    "publicationState": "published",
    "dataPublishedTime": "2013-11-21T13:52:02.006086",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/21774/?format=api",
        "dataPath": "/badc/cmip5/data/cmip5/output1/MIROC/MIROC5/sstClim4xCO2/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 217795922427,
        "numberOfFiles": 1401,
        "fileFormat": "Data are netCDF formatted."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/5815/?format=api",
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    "nonGeographicFlag": false,
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            "accessCategory": "registered",
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            "label": "registered: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/cmip5_open.pdf",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
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            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}