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/6108/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 6108,
    "uuid": "a20a19eaea281b50d333f3225e8115a4",
    "title": "Met Office: Vaisala Radian LAP3000 915MHz vertical wind profiler measurements at Isle of Man, UK (2005 - 2012)",
    "abstract": "The Met Office installed a Vaisala Radian LAP3000 915 MHz wind profiler near Meary Veg close to the Ronaldsway Aiport on the Isle of Man in 2005, relocating the instrument from its former deployment on South Uist which itself followed a deployment at the MST radar site at Capel Dewi near Aberystwyth. The deployment on the Isle of Man was an integral part of the Met Office's UK \"Operational Upper Air Network.\" Operating at 915 Mhz, it provides high resolution wind information from just above the surface (around 300m) up to a maximum of 8 km, depending on the atmospheric conditions. The site is located at 54.26 N, 4.37 W and a height of 55 m above mean sea-level and has a WMO id of 03203. The instrument's hight resolution is 60/200 m depending on the operational mode. It has a beam angle of 15.0 degrees and is operated with an averaging period of 30 minutes.\r\n\r\nThis dataset contains vertical wind profiles from the Vaisala Radian LAP3000 915MHz wind profiler located at the Isle of Man.",
    "keywords": "Met Office, wind",
    "publicationState": "published",
    "dataPublishedTime": "2003-11-16T16:06:42",
    "doiPublishedTime": null,
    "updateFrequency": "unknown",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/6109/?format=api",
        "dataPath": "/badc/ukmo-wind-prof/data/isleofman",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 892452953,
        "numberOfFiles": 1503,
        "fileFormat": "Data are ASCII formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/5073/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/137/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13200/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21769/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25857/?format=api"
    ],
    "dataLineage": "Data collected at various sites around the UK by the Met Office as part of the operational upper air network. A copy of the Met Office wind profiler data were then prepared and sent through to the BADC for use by the wider research community.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/3960/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/6095/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6092/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6599/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/25969/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/25971/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/25972/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/25973/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/25975/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/43128/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/43129/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/25970/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/6110/?format=api",
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2532/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "restricted",
            "accessRoles": "ukmo_wx",
            "label": "restricted: ukmo_wx group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/ukmo_agreement.pdf",
            "licenceClassifications": "academic"
        },
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2533/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "restricted",
            "accessRoles": "ukmo_wx_gov",
            "label": "restricted: ukmo_wx_gov group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/ukmo_agreement_gov.pdf",
            "licenceClassifications": "policy"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}