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/25075/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 25075,
    "uuid": "10ba8b8b61094c1b83940d8b49c39601",
    "title": "UGAMP: 3-D ozone column monthly average 1988",
    "abstract": "The UK Universities Global Atmospheric Modelling Programme (UGAMP) ozone climatology project. This  dataset contains a 3-dimensional climatology of ozone monthly means, combining various satellite observations and ozone sonde data. The data are global and covers 1988.\r\n\r\nEach file contains a ligne of text followed by the variable itself, in free format.\r\n\r\nEvery single three-dimensional field var is stored as\r\n\r\n(((var(i, j, k), i=1, 144), j=1, 73), k=1, 47)\r\nwhere\r\ni is the longitude index (from 0°E to 357.5°E by 2.5°);\r\nj is the latitude index (from South Pole to North Pole by 2.5°);\r\nk is the level index (from top to bottom).\r\n\r\nEvery two-dimensional field (zonal means) is stored as\r\n\r\n((var(j, k), j=1, 73), k=1, 47)\r\nwith the same conventions as above.",
    "keywords": "UGAMp, Model, Climate, ozone",
    "publicationState": "published",
    "dataPublishedTime": "2007-01-08T15:44:21",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/25076/?format=api",
        "dataPath": "/badc/ugamp-o3-climatology/data/y88",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 13960373,
        "numberOfFiles": 13,
        "fileFormat": "Data are ASCII formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/6782/?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/21771/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/22896/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25394/?format=api"
    ],
    "dataLineage": "Data provided as is by the University of Reading from satellite observations (SBUV, SAGE II, SME, TOMS) as well as ozone sonde data provided by the Atmospheric Environment Service of Canada. Data is provided to the BADC where it is then stored.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/1275/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/1272/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102742/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102743/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102744/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102746/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102747/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102748/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102749/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/102745/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/1284/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2526/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}