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/2305/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 2305,
    "uuid": "7a26a7868b77dedd1ee2296890ab7794",
    "title": "Euroclim500 - Causes of change in European mean and extreme climate over the past 500 years: HadCM3 model output from the NoLUSE experiment",
    "abstract": "Numerical climate output from the NoLUSE experiment run of the HadCM3 climate model as part of the NERC funded Euroclim500 project: Causes of change in European mean and extreme climate over the past 500 years. These data were produced by Andrew Schurer, Mike Mineter and Simon Tett using the HadCM3 climate model on the HECTOR supercomputer at the University of Edinburgh. This dataset includes data from 4 ensembles, r1 to r4. All ensembles ran with Solar, Volcs, GHGs, O3 and Orb forcings, the LUSE forcing set at 1400 levels and AER from 1820 onwards. The data are available in CF-netCDF to all registered users under the UK Government Open Data License.",
    "keywords": "HadCM3, Climate",
    "publicationState": "published",
    "dataPublishedTime": "2013-08-20T09:52:55",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2306/?format=api",
        "dataPath": "/badc/euroclim500/data/NoLUSE",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 2530419839786,
        "numberOfFiles": 2633,
        "fileFormat": "&lt;div property=\"cedacat:formats\"&gt;\n&lt;div class=\"formats\"&gt;Data availability and file format&lt;/div&gt;\n&lt;p&gt;Data are in CF-NetCDF format.&lt;/p&gt;\n&lt;/div&gt;\n\n\n"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/618/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/1/?format=api",
    "nonGeographicFlag": false,
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3357/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3360/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3361/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3365/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3367/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3410/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3411/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52362/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52363/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52364/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52365/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52366/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52367/?format=api",
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    ],
    "dataLineage": "Data produced on HECTOR computer at Edinburgh using HadCM3 model by Mike Mineter and Andrew Schurer during 2011/12, and converted from pp to cf-netcdf format. These files then supplied to BADC as they were produced by Andrew Schurer.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
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            "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"
        }
    ]
}