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/25964/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 25964,
    "uuid": "ed7d19d3be8d43bbb3ae804418fb7bf4",
    "title": "Arctic Cloud Summer Expedition (ACSE): visibility and precipitation measurements from the Finnish Meteorological Institute Vaisala FD12P present weather sensor on board Icebreaker Oden",
    "abstract": "This dataset contains visibility and precipitation measurements from the Finnish Meteorological Institute (FMI) Vaisala FD12P present weather sensor, operated by cruise participants from Stockholm University, on board Icebreaker Oden mounted on board the Swedish Icebreaker Oden durning Arctic Cloud Summer Expedition (ACSE). These data were then prepared by Ian Brooks from the University of Leeds for inclusion in this archive.\r\n\r\nACSE took place in the Arctic during summer 2014. These measurements were used to complement a suite of other observations taken during the cruise. Those of the UK contribution, as well as selected other data such as these data, are available within the associated data collection in the Centre for Environmental Data Analysis (CEDA) archives. Other cruise data may be available in the NOAA ACSE and The Bolin Centre for Climate Research SWERUS (SWEdish-Russian-US) holdings - see online resources linked to this record.\r\n\r\nSome outputs from this instrument were used as part of the quality control for some other measurements.\r\n\r\nThe Arctic Cloud Summer Expedition (ACSE) was a collaboration between the University of Leeds, the University of Stockholm, and NOAA-CIRES. ACSE aimed to study the response of Arctic boundary layer cloud to changes in surface conditions in the Arctic Ocean as a working package of the larger Swedish-Russian-US Investigation of Climate, Cryosphere and Carbon interaction (SWERUS-C3) Expedition in Summer 2014. This expedition was a core component to the overall SWERUS-C3 programme and was supported by the Swedish Polar Research Secretariat.\r\n\r\nACSE took place during a 3-month cruise of the Swedish Icebreaker Oden from Tromso, Norway to Barrow, Alaska and back over the summer of 2014. During this cruise ACSE scientists measured surface turbulent exchange, boundary layer structure, and cloud properties. Many of the measurements used remote sensing approaches - radar, lidar, and microwave radiometers - to retrieve vertical profiles of the dynamic and microphysical properties of the lower atmosphere and cloud.\r\n\r\nThe UK participation of ACSE was funded by the Natural Environment Research Council (NERC, grant: NE/K011820/1) and involved instrumentation from the Atmospheric Measurement Facility of the UK's National Centre for Atmospheric Science (NCAS AMF). This dataset collection contains data mainy from the UK contribution with some additional data from other institutes also archived to complement the suite of meteorological measurements.",
    "keywords": "visibility, precipitation",
    "publicationState": "citable",
    "dataPublishedTime": "2018-04-14T12:43:04",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "final",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/25965/?format=api",
        "dataPath": "/badc/acse/data/fmi-vaisala-fd12p",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 6114320,
        "numberOfFiles": 2,
        "fileFormat": "Data are CF-compliant netCDF formatted."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/7013/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/2195/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/4385/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54754/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/56587/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/56588/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/56589/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/56590/?format=api"
    ],
    "dataLineage": "Data were collected, quality controlled and prepared for archiving by the instrument scientists before upload to the Centre for Environmental Data Analysis (CEDA) for long term archiving.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/10090/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/24932/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/25948/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108578/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108579/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108581/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108582/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108583/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108584/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108580/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108577/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108585/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/109263/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108586/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/25967/?format=api",
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2522/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "registered",
            "accessRoles": null,
            "label": "registered: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}