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/7970/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 7970,
    "uuid": "16e747e3eaac76de08043d4c1b8d32da",
    "title": "NCAVEO: Atmospheric water data profile version 1.0, collected using an UV Raman LiDAR at Chilbolton Facility for Atmospheric and Radio research",
    "abstract": "An atmospheric water vapour profile was recorded using a UV Raman LiDAR located at Chilbolton Facility for Atmospheric and Radio Research (CFARR), during the Network for Calibration and Validation of EO data (NCAVEO) 2006 Experiment. The profile was recorded on 16th June 2006, one day before the ‘golden day’. The ground-based Raman LiDAR system at the CFARR transmits a high power Nd:YAG pulse laser beam vertically into the atmosphere at 355 nm wavelength. The LiDAR measures both elastic backscattering and water vapour profiles in the troposphere. Inelastic scattering of the laser radiation by molecules in the atmosphere, termed Raman scattering, is used to determine the atmospheric water vapour and temperature profiles. This dataset contains data for the raw (20s/7.5m) and processed (5min/22.5m) data in separate files. For further information on the parameters used during the data collection and the data's file format please see the dataset's metadata document in linked documentation. ",
    "keywords": "NCAVEO, WATER PROFILE, LIDAR, CHILBOLTON",
    "publicationState": "published",
    "dataPublishedTime": "2008-09-26T09:10:17",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/12692/?format=api",
        "dataPath": "/neodc/ncaveo_field/data/cfarr-lidar-uv",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 6411788,
        "numberOfFiles": 11,
        "fileFormat": "Raw and processed data are in separate NetCDF files, accessible using HDFView, a visual software tool that can be freely downloaded from http://www.hdfgroup.org/products/java/hdfview/. 2 images providing quick examples of the data are also available in JPG format. "
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/2279/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/172/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54654/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54655/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54656/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54657/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54658/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54659/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54660/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54661/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54662/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54664/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54665/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54666/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54667/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55839/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55840/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55841/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55842/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55843/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55844/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/55845/?format=api"
    ],
    "dataLineage": "These data were provided to NEODC by university of Southampton, who carried out work to convert formats to NASA-Ames, and write metadata documents. The metadata documents describing the processing are archived alongside the data as PDF files.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/5182/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/7827/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/7824/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/30128/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32654/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32659/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32653/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32656/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32657/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32658/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32660/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/32655/?format=api"
    ],
    "procedureAcquisition": "https://api.catalogue.ceda.ac.uk/api/v2/acquisitions/7973/?format=api",
    "procedureCompositeProcess": null,
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2522/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "registered",
            "accessRoles": null,
            "label": "registered: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}