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/33462/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 33462,
    "uuid": "acdfa050673c46d49d6a35bfa482762b",
    "title": "Mars Analysis Correction Data Assimilation (MACDA): MGS/TES v1.0 Reference Run Data",
    "abstract": "This dataset contains basic gridded atmospheric and surface variables for the planet Mars over three martian years (a martian year is 1.88 terrestrial years), produced as a reference run in association with the Mars Analysis Correction Data Assimilation (MACDA) v1.0 re-analysis. Each file in the dataset spans 30 martian mean solar days (sols) during the science mapping phase of the National Aeronautics and Space Administration's (NASA) Mars Global Surveyor (MGS) spacecraft, between May 1999 and August 2004.\r\n\r\nThis dataset is a reference run produced by re-analysis of Thermal Emission Spectrometer (TES) retrievals of only total dust opacities, using the MACDA scheme in a Mars global circulation model (MGCM). This reference dataset, therefore, should be used in association with the full re-analysis of TES retrievals of nadir thermal profiles and total dust opacities  - see linked dataset.\r\n\r\nThe MGCM used is the UK spectral version of the model developed by the Laboratoire de Météorologie Dynamique in Paris, France.\r\n\r\nMACDA is a collaboration between the University of Oxford and The Open University in the UK.",
    "keywords": "Mars, Martian, MGCM",
    "publicationState": "citable",
    "dataPublishedTime": "2022-01-19T15:01:32",
    "doiPublishedTime": "2022-01-24T10:21:08",
    "updateFrequency": "notPlanned",
    "status": "superseded",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/33463/?format=api",
        "dataPath": "/badc/mgs/data/macda/v1-0_reference-run",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 18577536228,
        "numberOfFiles": 65,
        "fileFormat": "Data are CF-compliant netCDF"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3061/?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/1050/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6019/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6020/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9834/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9835/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9836/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9837/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9838/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9839/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9840/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9841/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9842/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/9843/?format=api"
    ],
    "dataLineage": "Data provided to the Centre for Envirnomental Data Analysis (CEDA) by the project team members in December 2021. Mars Global Surveyor/ Thermal Emission Spectrometer retrievals have been provided by Michael D. Smith (National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, MD, USA) to the University of Oxford in 2005.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/10982/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/11610/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/11018/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149487/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149492/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149491/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149490/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149489/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149488/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149494/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149493/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149495/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149497/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149498/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/149499/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/11616/?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"
        }
    ]
}