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/26598/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 26598,
    "uuid": "9d0f61dc7a1b4017b22d88f9d38ab398",
    "title": "IPCC AR5 Seasonal Mean Temperature and Precipitation in IPCC Regions for CMIP3 and CMIP5",
    "abstract": "Projected regional average change in seasonal and annual mean temperature and precipitation for the IPCC SREX regions for CMIP5 and CMIP3.  The data were produced in 2014 by the Intergovernmental Panel on Climate Change (IPCC) Working Group II (WGII) Chapter 21 author team for the IPCC Fifth Assessment Report (AR5). \r\n\r\nRegional average seasonal and annual mean temperature and precipitation for the period 2071-2100 are compared to a baseline of 1961-1990 for CMIP5 and CMIP3 General Circulation Model (GCM) projections.\r\nThe data compare the range of projections from 35 Coupled Model Intercomparison Project Phase 5 (CMIP5) ensemble under four Representative Concentration Pathway (RCP) scenarios compared with GCM projections from 22 CMIP3 ensemble under three Special Report on Emission Scenarios (SRES) scenarios. \r\n\r\nRegional averages are based on SREX regions defined by the IPCC Special Report on Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation (IPCC, 2012: also known as \"SREX\").",
    "keywords": "IPCC AR5 IPCC-DDC regional CMIP CMIP3 CMIP5 SREX RCP25 RCP45 RCP60 RCP85 A1B A2 B1",
    "publicationState": "published",
    "dataPublishedTime": "2019-09-11T15:01:08",
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/27739/?format=api",
        "dataPath": "/badc/ipcc-ddc-regions/data/ar5/seasonal-means",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 6785403,
        "numberOfFiles": 8,
        "fileFormat": ".xls, .csv, .txt"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/7404/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/2411/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58094/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58095/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58096/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58097/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58098/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58099/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58100/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58101/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58102/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58103/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58104/?format=api"
    ],
    "dataLineage": "Temperature and Precipitation in IPCC Regions for CMIP3 and CMIP5 prepared from CMIP5 projections for the IPCC 5th Assessment Report WGII; reformatted for the IPCC DDC by CEDA;\r\n\r\nOriginal data generated for the IPCC AR5 WGII team by Carol McSweeney (UK Met Office).\r\n\r\nscatter_headings.csv headings correspond to the data in IPCC-AR5-WGII-Chap21SM_scatter.csv\r\n\r\nvar_IPCC-AR5-WGII-Chap21SM_scatter.csv has the same data in a different organisation .. more columns, fewer rows.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/426/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/11975/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/26579/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/5525/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115955/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115949/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115950/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115958/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115952/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115953/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115954/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115956/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115957/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/115951/?format=api"
    ],
    "procedureAcquisition": null,
    "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"
        }
    ]
}