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/14465/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 14465,
    "uuid": "a55694199afd4993869fafce201c1b0a",
    "title": "ECMWF ERA-Interim: monthly ozone climatology source data from satellite and ozonesondes (1966-1993)",
    "abstract": "This monthly ozone climatology dataset was produced from a combination of satellite and ozonesonde data from 1966 to 1993. It was produced following the method described by Fortuin and Langematz (1994) and is used by the radiation code within the ECMWF IFS to generate the output from from ERA-Interim reanalysis model runs (see Dee et al. 2011 for further details).\r\n\r\nThe ozone values are given in ppmv on 36 vertical pressure levels and 19 latitudinal bands. These are then internally interpolated to the grid used by the model before entering the radiation scheme.\r\n\r\nThe 19 latitudinal bands the data are present are at: -90, -80, -70, -60, -50, -40, -30, -20, -10, 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 degrees.\r\n\r\nThe climatology was originally produced by Fortuin and Langematz (1994) in response to the many GCMs at that time that used a prescribed ozone field. The aim was to generate a reference field with the required spatial and temporal coverage for use within modelling studies.",
    "keywords": "ECMWF, ERA, Interim, reanalysis, surface, model, Gaussian, N256, analysis",
    "publicationState": "published",
    "dataPublishedTime": "2016-12-22T16:25:32",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/14466/?format=api",
        "dataPath": "/badc/ecmwf-era-interim/data/supplementary/fortuin_langematz_ozone_climatology",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 35530,
        "numberOfFiles": 3,
        "fileFormat": "Data are NetCDF formatted."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3840/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/1/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13235/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13236/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13237/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13238/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25394/?format=api"
    ],
    "dataLineage": "Data are generated by the ERA-Interim project team at European Centre for Medium-Range Weather Forecasts (ECMWF) as part of the input into the ECMWF IFS. These data were then extracted from the ECMWF system by Alessio Bozzo at ECMWF and sent to Alison Ming, University of Cambridge, for preparation before submission to Centre for Environmental Data Analysis (CEDA) for ingestion into the archive.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/6305/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6302/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56118/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56115/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56117/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56122/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56119/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56120/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56121/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56116/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/56427/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/6306/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2639/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "registered",
            "accessRoles": null,
            "label": "registered: None group",
            "licenceURL": "http://creativecommons.org/licenses/by/3.0/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}