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/10967/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 10967,
    "uuid": "6a7935465d374c7a9eac70c046f4cfcb",
    "title": "Raw Data from Digital Ionosondes for COST-271 Action Effects of the Upper Atmosphere on Terrestrial and Earth-Space Communications",
    "abstract": "This service gives access to a collection of raw data files and processed data gathered from digital ionosondes, mostly in Europe, from 1995 to the present day, as part of the UK contribution to the COST-271 action Effects of the Upper Atmosphere on Terrestrial and Earth-Space Communications.\r\n\r\nThis Prompt Ionospheric Database Service gives access to a collection of raw data files gathered from ionosondes, mostly in Europe, and has been developed as part of the UK contribution to the COST-271 action Effects of the Upper Atmosphere on Terrestrial and Earth-Space Communications. If you are new to ionospheric sounding, basic introductions to ionosonde theory and ionogram interpretation are available from the UK Ionospheric Monitoring Group web site.\r\n\r\nThe observatories are located in Athens, Greece; Chilton, UK; Dources, Belgium; El Arenosillo, Spain; Juliursruh, Germany; Lerwick, UK; Lycksele, Sweden; Pruhonice, Czech Republic; Rome, Italy; Tortosa, Spain; Tromso, Norway; Warsaw, Poland.\r\n\r\n\r\nThe data can be queried and displayed in several ways, so that you can:\r\nGet details about the stations and who operates them. \r\nView data availability\r\nDisplay a table of auto-scaled parameters\r\nPlot selected auto-scaled parameters\r\nCarry out a true-height analysis (using POLAN with certain default options)\r\nProduce an SEC-style output file of parameters\r\nDownload raw data files for use with SAO-Explorer. \r\nRetrieve manually scaled parameters in the same format as the auto-scaled parameters\r\nIt is also possible to set up a 'schedule' of data retrievals to be carried out repeatedly and automatically, with the data products either e-mailed or made available on the UK Solar System Data Centre (UKSSDC) anonymous FTP site.",
    "keywords": "Ionosonde",
    "publicationState": "working",
    "dataPublishedTime": null,
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "ongoing",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/19791/?format=api",
        "dataPath": "http://www.ukssdc.ac.uk/prompt_database.html",
        "oldDataPath": [],
        "storageLocation": "external",
        "storageStatus": "offline",
        "volume": 0,
        "numberOfFiles": 0,
        "fileFormat": "paper"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3049/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/496/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "needed",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/19806/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/10944/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39564/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39567/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39568/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39569/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39570/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39563/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39565/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/39566/?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": []
}