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/24096/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 24096,
    "uuid": "90b28cd6975e43568e19122ee01b0476",
    "title": "SAFIRE-ATR42 AS54 EUFAR TETRAD Flight, 2010-09-15: in situ atmospheric measurements",
    "abstract": "In situ atmospheric measurements using the SAFIRE ATR42 Core Instrument suite onboard the ATR42 - SAFIRE aircraft for the TETRAD- Training & Education for Turbulence Research project (flight reference: as54).\r\n\r\nData were collected over the Toulon-Hyeres Airport (South of France) area.\r\n",
    "keywords": "TETRAD, EUFAR, aircraft, atmospheric",
    "publicationState": "citable",
    "dataPublishedTime": "2015-11-20T14:15:44",
    "doiPublishedTime": "2018-01-17T10:51:00",
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/24095/?format=api",
        "dataPath": "/badc/eufar/data/projects/tetrad/safire-atr42_as54_20100915_tetrad",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 94978742,
        "numberOfFiles": 6,
        "fileFormat": "Data are netCDF and ENVI Binary formatted. Ancillary files may be plain ASCII or PDF formatted. Image files may be PNG or JPG formatted."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/6560/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/1725/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/1050/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20228/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20229/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20230/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20231/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20232/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20233/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20234/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20235/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20237/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20238/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20239/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20240/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20241/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20242/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20243/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20244/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20245/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20247/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20248/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20249/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20250/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20251/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20252/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20253/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20254/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20255/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20256/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20257/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20258/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20260/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20262/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20264/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20266/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20268/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20269/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20270/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20271/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20272/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20273/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20274/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20298/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20299/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20300/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20301/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20307/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20308/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20309/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20310/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20313/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20319/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/20321/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/26124/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/26125/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/26126/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/26127/?format=api"
    ],
    "dataLineage": "Data were collected by instrument scientists during the flight before preparation and delivery for archiving at the Centre for Environmental Data Analysis (CEDA).",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/9443/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/19969/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6382/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/24084/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98827/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98820/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98823/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98824/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98825/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98826/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/106118/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/98819/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/106119/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/105923/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/106120/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/24093/?format=api",
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2528/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://creativecommons.org/licenses/by/4.0/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}