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/19851/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 19851,
    "uuid": "8bbde1a8a0ce4a86904a3d7b2b917955",
    "title": "Global Sea Ice Concentration reprocessing dataset 1978-2015 (v1.2)",
    "abstract": "This dataset is v1.2 of the reprocessed sea ice concentration dataset of the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF), and has been produced using passive microwave data from the SMMR, SSM/I and SSMIS sensors. Ice concentration is computed from atmospherically corrected brightness temperatures, using a combination of state-of-the-art algorithms and dynamic tie-points. The dataset includes error-bars for each grid cell (uncertainties). Version 1.2 covers and extended time period from Oct 2009-Apr 2015 (labelled OSI-409-a). \r\n\r\nNo results from the ESA CCI Sea Ice project has been applied to this version of the reprocessed data set. However, the next full OSI SAF reprocessing in late 2016 will include research results from the ESA CCI Sea Ice project. \r\n\r\nThe OSI SAF asks all users to register at their central web site. By doing so, you can choose to get service messages about sea ice products, and they will be able to serve you better. They will also be able to better report on the use of our products. So please register  at this site if you are not already registered. \r\n\r\nUsers of this data set should acknowledge the data set by using this reference: \r\nEUMETSAT Ocean and Sea Ice Satellite Application Facility. Global sea ice concentration reprocessing dataset 1978-2015 (v1.2, 2015), [Online]. Norwegian and Danish Meteorological Institutes. Available from http://osisaf.met.no\r\n",
    "keywords": "Sea Ice, Eumetsat, OSI SAF",
    "publicationState": "preview",
    "dataPublishedTime": null,
    "doiPublishedTime": null,
    "updateFrequency": "",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/19852/?format=api",
        "dataPath": "http://osisaf.met.no/p/ice/index.html#conc-reproc",
        "oldDataPath": [],
        "storageLocation": "external",
        "storageStatus": "online",
        "volume": 0,
        "numberOfFiles": 0,
        "fileFormat": "Data are in NetCDF"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/5199/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/897/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Data were produced by the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF).\r\n\r\n This catalogue record was created by CEDA in the context of the ESA CCI Open Data Portal Project.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [],
    "observationcollection_set": [],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/75344/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/75343/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/75348/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/75347/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/75342/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/204931/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/204932/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/204933/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2629/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "",
            "licenceClassifications": ""
        }
    ],
    "discoveryKeywords": []
}