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/6284/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 6284,
    "uuid": "17129bb5c8069a8e8cff93dc791e04a0",
    "title": "RAPID: HadCM3 control 9K simulation freshwater experiment",
    "abstract": "The \"ISOMAP UK\" project  was a combined data-modelling investigation of water isotopes and their interpretation during rapid climate change events project was a Natural Environment Research Council (NERC) RAPID Climate Change Research Programme project (Round 1 - NER/T/S/2002/00460 - Duration 1 May 2003 - 30 Apr 2008) led by Prof J.A. Holmes of the University College London, with co-investigators at the University of Southampton, University of Liverpool, University of Manchester, University of Bristol and the NERC British Antarctic Survey. \r\n\r\nThis dataset contains comparison of high-resolution isotope records from terrestrial archives in NW Europe with model simulations of isotopes in precipitation. This is a control 9K simulation, and a freshwater hosing experiment.  The freshwater hosing experiment had 5Sv of freshwater added to the North Atlantic for 1 year.  The freshwater forcing was then removed and the model allowed to adjust.\r\n\r\nRapid Climate Change (RAPID) was a £20 million, six-year (2001-2007) programme for the Natural Environment Research Council. The programme aimed to improve the ability to quantify the probability and magnitude of future rapid change in climate, with a main (but not exclusive) focus on the role of the Atlantic Ocean's Thermohaline Circulation.",
    "keywords": "RAPID, Climate change, water",
    "publicationState": "published",
    "dataPublishedTime": "2014-09-21T15:24:03",
    "doiPublishedTime": null,
    "updateFrequency": "asNeeded",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/6285/?format=api",
        "dataPath": "/badc/rapid/data/Holmes_Rapid1_Round1",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 199291333,
        "numberOfFiles": 15,
        "fileFormat": "Data are netCDF formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/5020/?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/1323/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/1636/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/2007/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/3063/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/4385/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8535/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8536/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8537/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8538/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8539/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8540/?format=api"
    ],
    "dataLineage": "Data files provided as is by Jeni Milsom at Bristol University.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/4084/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/19093/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6283/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26581/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26579/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26582/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26583/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26584/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26585/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/71864/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26580/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/72430/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/5533/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2526/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}