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/25384/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 25384,
    "uuid": "70146c789eda4296a3c3ab6706931d56",
    "title": "S-RIP: Zonal-mean heating rates of global atmospheric reanalyses on pressure levels",
    "abstract": "This dataset contains zonal-mean model-generated and diagnosed heating rates as potential temperature tendencies on pressure levels. The model-generated heating rates consist of total heating rates due to parameterized physics along with heating rates due to long-wave and short-wave radiative transfer, as generated during the model forecast step. The diagnosed heating rates are calculated from the zonal-mean atmospheric diagnostics (Zonal-mean reanalyses on pressure levels dataset) according to the zonal-mean thermodynamic equation. All heating rates are provided 6-hourly on identical horizontal and vertical grids as the dynamical variables included in Zonal-mean reanalyses on pressure levels dataset. However, the time axis of this dataset lags that of Zonal-mean reanalyses on pressure levels dataset by three hours.\r\n\r\nThis dataset was produced to facilitate the comparison of reanalysis datasets for the collaborators of the SPARC- Reanalysis Intercomparison Project (S-RIP). The dataset is substantially smaller in size compared to the full three dimensional reanalysis fields and uses unified numerical methods. The dataset includes all global reanalyses available at the time of its development and will be extended to new reanalysis products in the future.",
    "keywords": "S-RIP, Zonal mean, Pressure levels, Momentum equation, Transformed Eulerian mean,  E-P flux (Elliassen-Palm flux)",
    "publicationState": "citable",
    "dataPublishedTime": "2017-11-28T16:31:22",
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/25385/?format=api",
        "dataPath": "/badc/srip/data/diabatic",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 255618746151,
        "numberOfFiles": 32801,
        "fileFormat": "Data are netCDF formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/6774/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/529/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6023/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50416/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50542/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50543/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58067/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58068/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58069/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58070/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58071/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58072/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58073/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58074/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58075/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58076/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/58077/?format=api"
    ],
    "dataLineage": "The dataset was created for the SPARC- Reanalysis Intercomparison Project (S-RIP). Data has been archived at the Centre for Environmental Data Anaylsis (CEDA).",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/9574/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/25061/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/25062/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104755/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104756/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104757/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104758/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104760/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104761/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104762/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104754/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104759/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/25060/?format=api",
    "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"
        }
    ]
}