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/8213/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 8213,
    "uuid": "bbdbb4e5ef063592ad8f3288f8441569",
    "title": "Advanced Visible and Near InfraRed Radiometer type 2 (AVNIR 2) UK data",
    "abstract": "The Advanced Visible and Near InfraRed 4-band Radiometer type-2 (AVNIR-2) is a visible and near infrared 4-band radiometer offering 10m spatial resolution optical imagery that is often used for land and coastal earth observation applications. AVNIR-2 is on board the Japanese earth observation Advanced Land Observing Satellite (ALOS) and was developed by the Japanese Aerospace Exploration Agency (JAXA). The data were acquired by the Landmap project from ESA, and are available for large areas of the Republic of Ireland and small areas of Scotland and England, for 2007 to 2008. The Joint Information Systems Committee (JISC) funded Landmap service which ran from 2001 to July 2014 collected and hosted a large amount of earth observation data for the majority of the UK. After removal of JISC funding in 2013, the Landmap service is no longer operational, with the data now held at the NEODC.\r\n\r\nWhen using these data please also add the following copyright statement: ESA 2004/2005/2006/2007/2008…. Received and Distributed by University of Manchester under licence from the European Space Agency.",
    "keywords": "",
    "publicationState": "published",
    "dataPublishedTime": "2014-07-29T12:32:35",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "completed",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/8214/?format=api",
        "dataPath": "/neodc/landmap/data/optical/avnir2",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 39259067273,
        "numberOfFiles": 876,
        "fileFormat": "&lt;div property=\"cedacat:formats\"&gt;\n&lt;div class=\"formats\"&gt;Data availability and file format&lt;/div&gt;\n&lt;p&gt;The data are archived in the directory structure of region/year/data type/data for ease of use. Full Colour Composition (FCC), True Colour Composition (TCC) and Full Composite (FC) data are available as GeoTiff files which can be opened by most Geographic Information Systems (GIS) and Image Processors (IP) such as the freely available &lt;a href=\"http://www.brockmann-consult.de/cms/web/beam/\"&gt;Basic ERS &amp;amp; Envisat (A)ATSR and Meris Toolbox (BEAM)&lt;/a&gt; or &lt;a href=\"http://www.hexagongeospatial.com/products/ERDASERViewer/Details.aspx\"&gt;Erdas ER viewer&lt;/a&gt;. Geotiff files are TIFF files which have geographic metadata embedded as tags within the TIFF file. The geographic metadata can then be used to position the image in the correct location and geometry on the screen of a geographic information display. FCC data comprises of bands 4, 3 and 2, TCC of 3, 2 and 1 and FC of all bands. Metadata, in the form of aux, rrd and tfw files, are contained in the same folders as the data. The tfw files are GeoTiff World Files which are used to geo-reference images to an appropriate projection scheme.\n&lt;/p&gt;\n&lt;/div&gt;\n\n\n"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/2352/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/183/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Data collected and prepared by the Landmap team before a copy of the data were obtained by NEODC directly from Landmap.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/5293/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/8044/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/8212/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/33157/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/33158/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/33159/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/33160/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/43520/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/33156/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/43522/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/108871/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/43521/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/8219/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2588/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "restricted",
            "accessRoles": "landmap",
            "label": "restricted: landmap group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/landmap.pdf",
            "licenceClassifications": "academic, specific"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}