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/37066/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 37066,
    "uuid": "a07ea49c7b754f15af99005cd351f550",
    "title": "Passive seismicity recorded using four-component ocean bottom seismometers deployed in and around an active fluid flow structure: Scanner Pockmark, North Sea",
    "abstract": "A passive source seismic dataset was acquired during RRS James Cook cruise JC152, around the Scanner Pockmark Complex in the North Sea. Data were recorded on 25 four-component ocean bottom seismometers (OBS - hydrophone and three-component geophone), deployed in and around Scanner Pockmark, recording at a sampling rate of 4 kHz. The OBS recorded continuously between deployment and recovery (28/08/2017 to 05/09/2017) including through periods of active source seismic data acquisition, indicated in the cruise report (Bull, 2017).\r\n\r\nData are provided in miniSEED format. The receiver drop locations are provided in the associated metadata directory. The data were acquired as part of the 'Characterization of major overburden leakage pathways above sub-seafloor CO2 storage reservoirs in the North Sea' (CHIMNEY) project, funded by the Natural Environment Research Council (NERC) under grant reference NE/N016130/1.",
    "keywords": "seismic reflection, ocean bottom seismograph, active source seismology, passive source seismology, fluid flow pathways",
    "publicationState": "published",
    "dataPublishedTime": "2022-04-26T16:05:20",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/37067/?format=api",
        "dataPath": "/bodc/USO220011/CHIMNEY_OBS_passive",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 646089806422,
        "numberOfFiles": 21079,
        "fileFormat": "Data are miniseed formatted data files, file naming convention is a logger identifer fiollowed by the date and time of the drop in <YYYY><DOY>HHMMSS format,"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/10245/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/3423/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Passive seismic data were acquired during NERC cruise JC152 from August-September 2017 in the North Sea. The raw data were processed by the science party and provided to the British Oceanographic Data Centre for long-term archive. Data were subsequently archived at CEDA.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/37051/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/37081/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177204/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177207/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177203/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177202/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177208/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177206/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177201/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177205/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177209/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177210/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177211/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/177212/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/37079/?format=api",
    "procedureCompositeProcess": null,
    "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"
        }
    ]
}