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/2110/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 2110,
    "uuid": "a7a9bdfd26c101e4bdcfde1c8d158272",
    "title": "European Synoptic Network station data collated by the Met Office (1990-1996)",
    "abstract": "The Met Office European synoptic stations reported hourly surface data from 141 European stations for the period 1990-1996. The dataset includes parameters such as temperature, wind, rainfall, cloud cover, past and present weather, and visibility. Note - this has been superseded by the MIDAS Land Surface Station Dataset.",
    "keywords": "Met Office, meteorology, Europe, SYNOP",
    "publicationState": "published",
    "dataPublishedTime": "2007-01-23T00:31:53",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "obsolete",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2111/?format=api",
        "dataPath": "/badc/ukmo-synop/data/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 448761111,
        "numberOfFiles": 915,
        "fileFormat": "The data held at the BADC, are stored in a simple ASCII format (plain text and \"human\" readable). See linked documentation for information on the the European data file format."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3413/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/33/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13194/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/13197/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21911/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21912/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21913/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21919/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21920/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21935/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21937/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21939/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21945/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21948/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21950/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21951/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21954/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21960/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21961/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21962/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21964/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21966/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21978/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23421/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23600/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23603/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/23604/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25384/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25388/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25393/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25397/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25402/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25404/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25858/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25862/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25869/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25870/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25872/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25903/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25956/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/91306/?format=api"
    ],
    "dataLineage": "Data collated by the Met Office from messages transmitted by collecting stations for the period 1990-1996, and then delivered to the BADC for archiving.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/1490/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/4/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/2109/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9201/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9206/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9200/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9203/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9204/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9205/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9207/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/9202/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/2113/?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"
        }
    ]
}