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/20087/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 20087,
    "uuid": "b8285969426a4e00b7481434291ad603",
    "title": "EUSTACE / CCI:  Global clear-sky sea surface temperature from the (A)ATSR series at 0.25 degrees with estimates of uncertainty components, v1.2, 1991-2012",
    "abstract": "This dataset consists of Sea Surface Temperature data with uncertainty estimates, from the Along Track Scanning Radiometer series of satellite instruments (ATSR-1, ATSR-2 and AATSR).  It forms part of the collection of datasets from the EUSTACE (EU Surface Temperature for All Corners of Earth) project, which is producing publically available daily estimates of surface air temperature since 1850 across the globe for the first time by combining surface and satellite data using novel statistical techniques.\r\n\r\nThe Sea Surface Temperature data provided here were retrieved in the context  of the European Space Agency's (ESA's) Climate Change Initiative (CCI) Sea Surface Temperature (SST) project, and comprise a Level 3c gridded product, on a 0.25 degree grid.   This v1.2 product was provided for input into the EUSTACE project.   It is provided here for traceability; more recent CCI data is available from the SST CCI catalogue pages.",
    "keywords": "SST, EUSTACE, CCI",
    "publicationState": "citable",
    "dataPublishedTime": "2019-04-08T10:40:04",
    "doiPublishedTime": "2019-04-08T13:06:12",
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/27446/?format=api",
        "dataPath": "/neodc/eustace/data/satellite_skin_temperature/UOR/ocean/ATSR/L3C/v1.2/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 38475900280,
        "numberOfFiles": 7613,
        "fileFormat": "Data are in NetCDF format"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/7366/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/529/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50415/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50417/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52536/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52539/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52542/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52543/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52545/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57986/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57987/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/57989/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/59095/?format=api"
    ],
    "dataLineage": "The Sea Surface Temperature data were originally retrieved from the (A)ATSR series of satellite instruments in the context of the European Space Agency Climate Change Initiative product.\r\n\r\nData are provided and archived for the EU EUSTACE project, which has received funding by the European Union's Horizon 2020 research and inovation programme under grant agreement no 640171.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/10510/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/19556/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/20098/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/30128/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143590/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76399/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76396/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76398/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143589/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76397/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/114676/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/114679/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/114677/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/114680/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/114678/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/27432/?format=api",
    "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"
        }
    ]
}