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/1909/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 1909,
    "uuid": "edc26f533a631b18d971e7474a40325d",
    "title": "WLSTA: Climatic Land Surface Temperatures over a month and a square half degree grid.",
    "abstract": "This CD-ROM is produced by the European Space Agency (ESA) and contains land surface temperature demonstration products as estimated from the Advanced Very High Resolution Radiometer (AVHRR) sensor onboard the National Oceanic and Atmospheric Administration (NOAA) series of polar orbiters. The data used are from the full resolution (1 km) composites (decade) data set processed in the framework of the \"1 km AVHRR Global Land Data Set\" collaborative project of the United States Geological Survey (USGS) EROS Data Centre (EDC), NOAA, NASA, ESA under the guidance of IGBP and CEOS. This CD-ROM contains excerpts from the full resolution land surface temperature (1 km pixel) data set over Europe, as well as so called world monthly \"climatic values\" (0.5 degree x 0.5 degree grid). The full processed data set runs from July 1992 to June 1993. This dataset contains climatic land Surface temperatures measurements over a month and a square half degree grid.",
    "keywords": "WLSTA, Temperature, AVHRR",
    "publicationState": "published",
    "dataPublishedTime": "2007-02-13T18:57:06",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/1910/?format=api",
        "dataPath": "/badc/CDs/wlsta/climatic/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 87467069,
        "numberOfFiles": 37,
        "fileFormat": "Data are ASCII and Binary formatted"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3772/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/1/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/21955/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/24205/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/24206/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/24207/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25872/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25874/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25876/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25902/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25906/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25962/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25994/?format=api"
    ],
    "dataLineage": "The CD-ROM was produced by the European Space Agency (ESA) using the Advanced Very High Resolution Radiometer (AVHRR) sensor onboard the National Oceanic and Atmospheric Administration (NOAA) series of polar orbiters. It was published in the 1990's. CEDA-BADC acquired a copy and later uploaded its content into the BADC archive for online browsing.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/1379/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/1911/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/1908/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5537/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5542/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5536/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5540/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5541/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5543/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5539/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/5538/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/1916/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2521/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/missing_licence.pdf",
            "licenceClassifications": "unstated"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}