Observation Instance – Django REST framework

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/20022/?format=api

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 20022,
    "uuid": "275dfa6961464bfdada866b156f2605a",
    "title": "Sentinel 1B C-band Synthetic Aperture Radar (SAR): Extra Wide (EW) mode Ground Range Detected (GRD) Medium Resolution (MR) Level 1 data",
    "abstract": "This dataset contains Extra Wide swath (EW) Ground Range Detected (GRD) Medium Resolution (MR) C-band Synthetic Aperture Radar (SAR) data from the European Space Agency (ESA) Sentinel 1B satellite. Sentinel 1A was launched on 25th April 2016 and provides continuous all-weather, day and night imaging radar data. The EW mode is primarily used for wide-area coastal monitoring. The EW mode supports single (HH or VV) and dual (HH+HV or VV+VH) polarisation. These data are available via CEDA to any registered user in the UK.",
    "keywords": "Sentinel, radar, Synthetic Aperture Radar, SAR, Extra Wide, EW, Ground Range Detected, GRD",
    "publicationState": "published",
    "dataPublishedTime": "2022-10-26T14:02:18",
    "doiPublishedTime": null,
    "updateFrequency": "asNeeded",
    "status": "ongoing",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/20032/?format=api",
        "dataPath": "/neodc/sentinel1b/data/EW/L1_GRD/m/IPF_v2",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 12543638216111,
        "numberOfFiles": 240826,
        "fileFormat": "Image data files are in a binary format. Quicklook images are in png format. Manifest files with relevant metadata are in SAFE format."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/3587/?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/25947/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/25995/?format=api"
    ],
    "dataLineage": "Data collected and prepared by European Space Agency (ESA). Downloaded from the Collaborative Hub for use by the UK scientific community.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/12321/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/20016/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/30129/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76122/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76121/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76126/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/146223/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76123/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/143591/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76125/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76127/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76128/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/146224/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/76124/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/20019/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2586/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://sentinel.esa.int/documents/247904/690755/Sentinel_Data_Legal_Notice",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": []
}