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/29910/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 29910,
    "uuid": "a11904c87b50418d898756a9d9d12579",
    "title": "BACI: System State Vector (SSV)  land surface time series dataset for the Ethiopian fast track site, 2000-2015,  v1.0",
    "abstract": "The BACI Surface State Vector (SSV) dataset for the Ethopian fst track site and provides a description of the surface state from a combination of satellite observations across wavelength domains i.e. albedo (visible), Land Surface Temperature (LST) (passive/thermal microwave) and backscatter (active microwave). The dataset contains a unique spatially and temporally consistent (as far as the observations allow) series of observations of the land surface, across optical and microwave domains. The innovation of this approach is in providing a SSV in a common space/time framework, containing information from multiple, independent data streams, with associated uncertainty. The methods used can be used to combine data from multiple different satellite sources. The resulting dataset is intended to make the best use of all available observations to detect changes in the land surface state: the combination of data is likely to show changes that would not be apparent from data in a single wavelength region. The inclusion of uncertainty also allows the strength of the resulting changes to be properly quantified.",
    "keywords": "BACI, TOWARDS A BIOSPHERE ATMOSPHERE CHANGE INDEX, State Surface Vector, Ethiopia, albedo, mircrowave, backscatter",
    "publicationState": "working",
    "dataPublishedTime": null,
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "planned",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/29911/?format=api",
        "dataPath": "/neodc/baci_ssv/data/v1.0/fast_track_sites/03_ethiopia/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 862,
        "numberOfFiles": 1,
        "fileFormat": "netCDF version 4"
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/8136/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/2554/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [],
    "dataLineage": "Provided by Mathias Disney of  the University College London BACI project team to CEDA for publication",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/27434/?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/204946/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129158/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129156/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129160/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129163/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/204945/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129150/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129157/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129161/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129162/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129151/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129255/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129152/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129153/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129154/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129155/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/27704/?format=api",
    "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": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}