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/29933/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 29933,
    "uuid": "4b344dac208f4a82a35d544f6837d111",
    "title": "ESA Soil Moisture Climate Change Initiative (Soil_Moisture_cci): PASSIVE Product, Version 04.5",
    "abstract": "The Soil Moisture CCI PASSIVE dataset is one of the three datasets created as part of the European Space Agency's (ESA) Soil Moisture Essential Climate Variable (ECV) Climate Change Initiative (CCI) project. The product has been created by merging data from the SMMR, SSM/I, TMI, AMSR-E, WindSat, AMSR2 and SMOS satellite instruments. ACTIVE and COMBINED products have also been created.\r\n\r\nThe v04.5 PASSIVE product presents a global coverage of surface soil moisture at a spatial resolution of 0.25 degrees. The product is provided in volumetric units [m3 m-3] and covers the period (yyyy-mm-dd) 1978-11-01 to 2018-12-31. It consists of global daily images stored within yearly folders and are NetCDF-4 classic file formatted. For information regarding the theoretical and algorithmic base of the product, please see the Algorithm Theoretical Baseline Document. Other additional reference documents and information relating to the dataset can also be found on the CCI Soil Moisture project web site or within the Product Specification Document.\r\n\r\nThe data set should be cited using all three of the following references:\r\n\r\n1. Gruber, A., Scanlon, T., van der Schalie, R., Wagner, W., and Dorigo, W. (2019). Evolution of the ESA CCI Soil Moisture climate data records and their underlying merging methodology, Earth Syst. Sci. Data, 11, 717–739, https://doi.org/10.5194/essd-11-717-2019\r\n\r\n2. Dorigo, W.A., Wagner, W., Albergel, C., Albrecht, F., Balsamo, G., Brocca, L., Chung, D., Ertl, M., Forkel, M., Gruber, A., Haas, E., Hamer, D. P. Hirschi, M., Ikonen, J., De Jeu, R. Kidd, R. Lahoz, W., Liu, Y.Y., Miralles, D., Lecomte, P. (2017). ESA CCI Soil Moisture for improved Earth system understanding: State-of-the art and future directions. In Remote Sensing of Environment, 2017, ISSN 0034-4257, https://doi.org/10.1016/j.rse.2017.07.001\r\n\r\n3. Gruber, A., Dorigo, W. A., Crow, W., Wagner W. (2017). Triple Collocation-Based Merging of Satellite Soil Moisture Retrievals. IEEE Transactions on Geoscience and Remote Sensing. PP. 1-13. 10.1109/TGRS.2017.2734070",
    "keywords": "ESA, CCI, PASSIVE",
    "publicationState": "published",
    "dataPublishedTime": "2019-12-19T18:19:14",
    "doiPublishedTime": null,
    "updateFrequency": "notPlanned",
    "status": "superseded",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/29934/?format=api",
        "dataPath": "/neodc/esacci/soil_moisture/data/daily_files/PASSIVE/v04.5",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 11957254311,
        "numberOfFiles": 14672,
        "fileFormat": "Data are netCDF formatted."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/8154/?format=api",
    "geographicExtent": "https://api.catalogue.ceda.ac.uk/api/v2/bboxes/529/?format=api",
    "nonGeographicFlag": false,
    "phenomena": [
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/50512/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52664/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/52665/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54641/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54643/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54646/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54647/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54648/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54649/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54650/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/54651/?format=api"
    ],
    "dataLineage": "Data were processed by the ESA CCI Soil Moisture project team and transferred to CEDA for the ESA CCI Open Data Portal Project. This dataset forms part of the Soil Moisture v04.5 dataset (doi:10.5285/38b8e5e524e1449ab4b4994970752644. http://dx.doi.org/10.5285/38b8e5e524e1449ab4b4994970752644)",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/13332/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/29937/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129333/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129334/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129336/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129337/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129338/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129339/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129340/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129335/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129342/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129341/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129343/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129344/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129345/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129346/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129347/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129348/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129349/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129350/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129620/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/129351/?format=api"
    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": "https://api.catalogue.ceda.ac.uk/api/v2/composites/27140/?format=api",
    "procedureComputation": null,
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2535/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "https://artefacts.ceda.ac.uk/licences/specific_licences/esacci_soilmoisture_terms_and_conditions.pdf",
            "licenceClassifications": "any"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}