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/6293/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 6293,
    "uuid": "51fa59ba02504de3d7e6ce21b155f742",
    "title": "3 GHz S-band radar data at Chilbolton Observatory site (CAMRa) for the CWVC Campaign (1999-2001)",
    "abstract": "These data are part of the NERC Clouds, Water Vapour and Climate (CWVC) programme. With a diameter of 25 metres the 3 GHz CAMRa at Chilbolton Observatory (UK) is the largest steerable meteorological radar in the world. Polarisation and Doppler data are stored in netCDF format for 30 March 1999, 9 June 2000, 20 October 2000, 21 November 2000, and 28 February 2001. Quicklook images are also available.",
    "keywords": "ENGINEERING SPECTRAL",
    "publicationState": "published",
    "dataPublishedTime": "2007-02-16T22:59:12",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/6294/?format=api",
        "dataPath": "/badc/cwvc/data/Mixed_phase_clouds",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 3963432215,
        "numberOfFiles": 4857,
        "fileFormat": "&lt;div property=\"cedacat:formats\"&gt;\n&lt;div class=\"formats\"&gt;Availability of data and file format&lt;/div&gt;\n&lt;p&gt;\nData and quicklook images, for 30 March 1999, 9 June 2000,\n20 October 2000, 21 November 2000, 28 February 2001, are available.\n\n&lt;/p&gt;&lt;p&gt;Data are stored in the BADC\n&lt;a href=\"http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/cwvc/data/Mixed_phase_clouds/radar-camra\"&gt;CWVC Mixed Phase Clouds data project archive&lt;/a&gt;.\n\n&lt;/p&gt;&lt;p&gt;Images are stored in the BADC\n&lt;a href=\"http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/cwvc/images/Mixed_phase_clouds/\"&gt;CWVC Mixed Phase Clouds images project archive&lt;/a&gt;.\n&lt;/p&gt;&lt;p&gt;\nThe data are in &lt;a href=\"http://badc.nerc.ac.uk/help/formats/netcdf/\"&gt;netCDF&lt;/a&gt; (binary) \nformat and comply with the CF conventions (\n&lt;a href=\"http://www.cfconventions.org\"&gt;NetCDF Climate and Forecast Metadata\nConvention&lt;/a&gt; (Eaton et al., 2001)).\n&lt;/p&gt;\n\n&lt;p /&gt;&lt;/div&gt;\n"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/1829/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/63/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8476/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8477/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8478/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8479/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8480/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8481/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8482/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8483/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8484/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8485/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8486/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8487/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8488/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8489/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25971/?format=api"
    ],
    "dataLineage": "Data files supplied as is in 2003; filenames may have been updated from original to be consistent with the BADC Filename convention.\nPolarisation and Doppler data are stored in netCDF format for 30 March 1999, 9 June 2000, 20 October 2000, 21 November 2000, and 28 February 2001.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/4094/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/868/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6292/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26619/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26618/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26623/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26624/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26617/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26620/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26621/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/26622/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54660/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/6295/?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"
        }
    ]
}