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/13817/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 13817,
    "uuid": "e2fa7ab1d5b34e2b928b23488329ddef",
    "title": "SPECS - ECMWF-IFS4 Model data prepared for SPECS SnowInit (2004-2014)",
    "abstract": "This dataset includes the ECMWF-IFS4 model output prepared for SPECS SnowInit (2004-2014). These data were prepared by the European Centre for Medium-range Weather Forecasting (ECMWF), as part of the SPECS project. \r\n\r\nModel id is IFS4 (atmosphere: IFS4(201505212,CY42R1,N128TL255L91); ocean:NEMO3.4.1(L34E5,ORCA1_Z42,1°L42); seaice:N/A; MACC:N/A; land:CHTESSEL,ERA-Interim forcing, lakes, fixed glaciers (CY41R1, internal exp.id gd80, climate.v012); wave:WAM(CY41R1,1°); ozone:Cariolle(v2.9); climversion:climate.v012), no external forcing.\r\n\r\nfrequency is daily and monthly. \r\n\r\nDaily Atmospheric variables are:\r\nclt  pr  psl  rlut  rsds  tas  tasmax  tasmin  tdps  uas  vas\r\n\r\nMonthly atmos variables:\r\nal  clt  hfls  hfss  mrso  pr  psl  rls  rlut  rsds  rsdt  rss  rsut  snld  ta  tas  tasmax  tasmin  tdps  uas  vas  zg\r\n\r\n",
    "keywords": "specs, ifs, ecmwf, climate, model",
    "publicationState": "published",
    "dataPublishedTime": "2015-12-17T19:19:25",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/13818/?format=api",
        "dataPath": "/badc/specs/data/SPECS/output/ECMWF/IFS4/snowInit/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 2343168101397,
        "numberOfFiles": 149843,
        "fileFormat": "NetCDF"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3688/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/528/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/6023/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/11044/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/11045/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50418/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50426/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50475/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50496/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50498/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50554/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50555/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50566/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50579/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50591/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50596/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50598/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50603/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50608/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52741/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52747/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52748/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52755/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53094/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53095/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53105/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53128/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53129/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53130/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53131/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53132/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53133/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53134/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53135/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/53136/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54797/?format=api"
    ],
    "dataLineage": "Data were supplied by SPECS participants to CEDA for archiving in 2015.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/8695/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/12970/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/6086/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52922/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52921/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52919/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52923/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52927/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52928/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52924/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52926/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/52925/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/54823/?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"
        }
    ]
}