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/2911/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 2911,
    "uuid": "e8b83d5b1f626c265d50e502e4b3eccd",
    "title": "ACSOE OXICOA FREETEX-96: Ozone and Radical Chemistry Data from Jungfraujoch High Alpine Research Station",
    "abstract": "The Atmospheric Chemistry Studies in the Oceanic Environment (ACSOE) was a 5-year Natural Environment Research Council (NERC) programme on tropospheric chemistry coordinated by the University of East Anglia and involving research groups from a number of UK universities and research institutes. The project had three consortia of UK institutes and universities, each of which focused on a different scientific topic. OXICOA (OXIdising Capacity of the Ocean Atmosphere) was a study of oxidant, radical and related gas-phase chemistry in the clean and moderately polluted marine atmosphere. The FREETEX (Free Troposphere Experiment) campaigns as part of ACSOE-OXICOA were carried to collect data. The dataset includes measurements of ozone (O3, NOx, NOy, HNO3, PAN, CO, HO2 + RO2, HCHO, VOCs, etc.), at the Jungfraujoch High Alpine Research Station (3,580m above sea level) over a five-week period in 1996 and again in 1998.",
    "keywords": "ACSOE, OXICOA, FREETEX",
    "publicationState": "published",
    "dataPublishedTime": "2007-03-23T23:35:16",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2912/?format=api",
        "dataPath": "/badc/acsoe/data/freetex-96",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 8133133,
        "numberOfFiles": 7,
        "fileFormat": null
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3559/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/739/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Data collected over a five week period in 1996 and again in 1998, by remote field sites (Mace Head, Ireland; Weybourne, Norfolk; Tenerife), from the NERC research vessels Challenger and Discovery and aboard the Meteorological Research Flight C-130 and the Cranfield Jetstream aircrafts. Data acquired by BADC for archiving as programme was underway. All files are written as ASCII and consist of a single header followed by one or several tables.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/2008/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/12821/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/2910/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13106/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13111/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13109/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13110/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13175/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13105/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13108/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13107/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13112/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13116/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13121/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13149/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/13174/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/2917/?format=api",
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "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"
        }
    ]
}