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/12493/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 12493,
    "uuid": "51132aea5ed0433ca338d32a912e3976",
    "title": "UKCP09: Met Office regional land surface climate observations - long term averages for administrative regions and river basins",
    "abstract": "This dataset contains a set of reference long term averages for observed climate variables that have been spatially averaged over a set of 14 administrative regions and 23 river basins across the British Isles (see links to maps and lists below). Where possible, reference climatologies for each of the periods 1961-1990, 1971-2000 and 1981-2010 are available for each variable. The availability of a variable for a given reference period was dependant on sufficient data for that variable within the reference period. Each regional value is an average of the 5km x 5km grid cell values that fall within it.  \r\n\r\nThe data were derived from the Met Office gridded land surface climate observations – long term averages at 5km resolution (See related dataset) and are provided as space delimited text files.\r\n\r\nThe 14 administrative regions used within UKCP09 were:\r\n- East Midlands                 \r\n- East of England               \r\n- East Scotland                 \r\n- London                        \r\n- North East England            \r\n- North Scotland                \r\n- North West England            \r\n- Northern Ireland              \r\n- South East England            \r\n- South West England            \r\n- Wales                         \r\n- West Midlands                 \r\n- West Scotland                 \r\n- Yorkshire & The Humber        \r\n\r\nThe 23 river basin regions used within UKCP09 were:              \r\n- Anglian                       \r\n- Argyll                        \r\n- Clyde                         \r\n- Dee                           \r\n- Forth                         \r\n- Humber                        \r\n- Neagh Bann                    \r\n- North East Scotland           \r\n- North Eastern Ireland         \r\n- North Highland                \r\n- North West England            \r\n- North Western Ireland         \r\n- Northumbria                   \r\n- Orkney and Shetland           \r\n- Severn                        \r\n- Solway                        \r\n- South East England            \r\n- South West England            \r\n- Tay                           \r\n- Thames                        \r\n- Tweed                         \r\n- West Highland                 \r\n- Western Wales",
    "keywords": "UKCP09, Met Office, DEFRA, land surface, climate observations",
    "publicationState": "published",
    "dataPublishedTime": "2017-08-21T11:41:06",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/12494/?format=api",
        "dataPath": "/badc/ukcp09/data/gridded-land-obs/gridded-land-obs-regional-averages",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 297955,
        "numberOfFiles": 79,
        "fileFormat": "Data are provided in the original ASCII format used within the UKCP09 project. Please see linked documentation for further details."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/6747/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/674/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13194/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13197/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21769/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21824/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21914/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21927/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21974/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21978/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23369/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23370/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23371/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/24576/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25388/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25397/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25869/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25871/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25872/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25882/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25978/?format=api"
    ],
    "dataLineage": "Data were produced by the Met Office for the UKCP09 service and then prepared for archiving with Centre for Environmental Data Analysis (CEDA).",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/12420/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/12422/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47862/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47861/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47860/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47859/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47857/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47856/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47855/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102084/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/47858/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/24942/?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"
        }
    ]
}