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/14158/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 14158,
    "uuid": "00a0da5d759d4d69ae866a23b84011be",
    "title": "ESA Ozone Climate Change Initiative (Ozone CCI): Merged Level 3 Limb Ozone Monthly Zonal Mean (MZM) Profiles, Version 2",
    "abstract": "This dataset consists of a gridded composite of limb ozone profile data, combining data from a range of instruments. \r\n\r\nThe data are  zonal mean time series (10° latitude bin) and include uncertainty/variability of the Monthly Zonal Mean. \r\n\r\nThe merged monthly zonal mean data (MMZM) include merged ozone profiles in 10° latitude zones for each month, on the ozone-CCI pressure grid from 250 hPa to 1 hPa, and the parameters which characterize the uncertainty of the merged profiles. In Phase I of the ESA CCI Programme, the dataset has been created for 2 years, 2007 and 2008.\r\n\r\nThe merged monthly zonal mean data are structured into monthly netcdf files with self-explanatory names. For example, the file “ESACCI-OZONE-L3-LP-MERGED-MZM-200801-fv0002.nc” contains merged monthly zonal mean data for January 2008. In addition to the variables of the merged data, the profiles from individual instruments with their uncertainty parameters are also included (for the altitude range 250-1 hPa used in data merging).",
    "keywords": "ESA, CCI",
    "publicationState": "published",
    "dataPublishedTime": "2016-03-08T16:50:45",
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/14363/?format=api",
        "dataPath": "/neodc/esacci/ozone/data/limb_profiles/l3/merged/merged_monthly_zonal_mean/v0002",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 3200067,
        "numberOfFiles": 25,
        "fileFormat": "Data is in NetCDF format"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3799/?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/52758/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54902/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54903/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54904/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54905/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54906/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54907/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54908/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54909/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54910/?format=api"
    ],
    "dataLineage": "Data were processed by the ESA CCI Ozone project team and supplied to CEDA as part of the ESA CCI Open Data Portal Project",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/14147/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/14148/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54388/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54389/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54391/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54520/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/104867/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/105080/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/105260/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54390/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54387/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2531/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/esacci_ozone_terms_and_conditions.pdf",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        },
        {
            "ob_id": 1140,
            "name": "ESACCI"
        }
    ]
}