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/6937/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 6937,
    "uuid": "6bf9eadf3ec582306367685756496600",
    "title": "HadCM2 data as part of LINK",
    "abstract": "This dataset contains output data from a number of models from the UK Met Office Hadley Centre which was processed into text files at the Climate Research Unit at the University of East Anglia. The data extraction was intended for use by the Climate Impacts Community (and was funded by the UK Departement of Environment Food and Rural Affairs, Defra).\r\n\r\nOutput from each model is stored in a separate directory in the BADC archive, and the majority of the data comes from experiments performed using the Hadley centre Coupled Model, Version 3 (HadCM3).\r\n\r\nNote that is dataset is kept for historical purposes only. More consistent and complete HadCM3 data is available from the main British Atmospheric Data Centre (BADC) HadCM3 archive.",
    "keywords": "",
    "publicationState": "published",
    "dataPublishedTime": "2007-03-10T01:28:27",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "ongoing",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/6938/?format=api",
        "dataPath": "/badc/link/data/HadCM2",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 47912203857,
        "numberOfFiles": 40828,
        "fileFormat": "&lt;div property=\"cedacat:formats\"&gt;\r\n&lt;div class=\"formats\"&gt;Data availability and file format&lt;/div&gt;\r\n        &lt;p&gt;The Met. Office LINK data are now available to registered LINK users. Please note that this dataset is still in the process of being populated from the original Met Office archive. These data are stored as binary PP files. Please follow this &lt;a href=\"http://badc.nerc.ac.uk/cgi-bin/data_browser/data_browser/badc/link\"&gt;link&lt;/a&gt; to access the archive&lt;/p&gt;\r\n \r\n&lt;/div&gt;\r\n\r\n\r\n"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/2004/?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/2823/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/2853/?format=api"
    ],
    "dataLineage": "Data from the UK Met Office Hadley Centre models including HadCM2, HadCM3, HadRM2, HadRM3 and HadGEM1. Data extracted by the BADC from the Met Office is usually kept in their binary pp format.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/4545/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/6935/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6932/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29620/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29624/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29623/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29619/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29626/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29618/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29621/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29622/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/29625/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/72436/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/6939/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2613/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "restricted",
            "accessRoles": "link",
            "label": "restricted: link group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/ukmo_agreement.pdf",
            "licenceClassifications": "academic"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}