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/26584/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 26584,
    "uuid": "e6edf4076e7e42f681f495ccf0ec22cb",
    "title": "20 and 30 year climatologies from CMIP3 climate model output as used in the 2007 IPCC Fourth Assessment Report (AR4)",
    "abstract": "Climatology data used in Climate Change 2007, the Fourth Assessment Report (AR4) of the United Nations Intergovernmental Panel on Climate Change (IPCC) calculated from Coupled Model Intercomparison Project Phase 3 (CMIP3) model output.\r\n\r\nSimulations of global climate models were run by various climate modelling groups coordinated by the World Climate Research Programme (WCRP) on behalf of the IPCC.\r\n\r\nClimatology data was calculated from global climate model simulations of experiments representative of Special Report on Emission Scenarios (SRES) scenarios: A1b, A2, B1, the commitment scenario experiment (COMMIT),  the twentieth century experiment (20C3M), the pre-industrial control (PICTL) and the idealised experiments 1PCTO2X and 1PCTO4X.\r\n\r\nThe AR4 climatologies are 20-year period averages. 30-year period averages have also been calculated for comparison with the IPCC Third Assessment Report (TAR).  The monthly climatology data covers the period from 1850-2100. The climatologies are of global scope and are provided on latitude-longitude grids.\r\n\r\nThe period averages are:\r\n20x: 20-year averages [+20-39, +46-65, +80-99, +180-199] as used in chapter 10 of IPCC 2007, \r\n30a: 30-year averages [+01-30, +31-60, +61-90] as used in the observed climatologies, \r\n30b: 30-year averages [+10-39, +40-69, +70-99] for compatibility with the IPCC 3rd Assessment Report (TAR).\r\n\r\nThe climatology period averages listed above are relative to AD2000 for SRES scenarios A1B, A2, B1, and the commitment scenario COMMIT, relative to AD1900 for the twentieth century run (20C3M) and relative to the start of the experiment for the pre-industrial control (PICTL) and the 1PCTO2X and 1PCTO4X runs.  \r\n\r\nData files are 'tar' files with names of the form [model]_[experiment]_[variable]_{climatology}.tar.  \r\n\r\nThe experiments in this dataset include the SRES future scenarios: \r\nA1B Globalisation with rapid economic growth, \r\nA2 Regionalisation with regionally oriented economic development, \r\nB1 Globalisation with global environmental sustainability.\r\nAlso:\r\nCOMMIT simulation of climate change we are committed to given the current loading of greenhouse gasses and zero future emissions. \r\nPICTL the pre-industrial control. \r\n20C3M the 20th century climate simulaiton. \r\n1PTO2X and 1PTO4X idealised simulaitons where the concentration of atmospheric carbon dioxide (CO2) is increased by 1 percent per year from pre-industrial concentration until reaching 2x and 4x the original concentration.\r\n\r\nThe dataset is comprised of monthly mean surface data for the following atmospheric variables: \r\nspecific humidity, \r\nprecipitation flux, \r\nair pressure at sea level, \r\nsurface downwelling shortwave flux in air, \r\nair temperature, \r\nair temperature daily max, \r\nair temperature daily min, \r\neastward wind, \r\nnorthward wind.",
    "keywords": "IPCC, DDC, AR4, CMIP3, SRES, COMMIT, PICTL, 20C3M, 1PCTO2X, 1PCTO4X, Climate Change",
    "publicationState": "published",
    "dataPublishedTime": "2021-06-01T20:39:47",
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/26583/?format=api",
        "dataPath": "/badc/ipcc-ddc/data/netcdf/ar4_v2",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 13488312498,
        "numberOfFiles": 16002,
        "fileFormat": "netcdf"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/7159/?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/6021/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6022/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8030/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8031/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/8142/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50512/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50559/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50561/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54336/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55250/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55251/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55252/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55253/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55254/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55255/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55256/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55257/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55258/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55259/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55260/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55261/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55262/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55263/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55264/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55265/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55266/?format=api"
    ],
    "dataLineage": "Climatology data calculated from global climate model simulations for a variety of experiments from  the Coupled Model Intercomparison Project Phase 3 (CMIP3).",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/26576/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/26582/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/5525/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143532/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143531/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143535/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143534/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143533/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/111715/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143545/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/111718/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143544/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/111716/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/111717/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2528/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://creativecommons.org/licenses/by/4.0/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}