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/30290/?format=api
HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "ob_id": 30290,
    "uuid": "3e9f387293294f3b8a850524fcfc0c9c",
    "title": "HadISDH land: gridded global monthly land surface humidity data version 4.2.0.2019f",
    "abstract": "This is the 4.2.0.2019f version of the HadISDH (Integrated Surface Database Humidity) land data. These data are provided by the Met Office Hadley Centre. This version spans 1/1/1973 to 31/12/2019. \r\n\r\nThe data are monthly gridded (5 degree by 5 degree) fields. Products are available for temperature and six humidity variables: specific humidity (q), relative humidity (RH), dew point temperature (Td), wet bulb temperature (Tw), vapour pressure (e), dew point depression (DPD). Data are provided in either NetCDF or ASCII format.\r\n\r\nThis version extends the 4.1.0.2018f version to the end of 2019 and constitutes a minor update to HadISDH due to changing some of the code base from IDL to Python 3 and detecting and fixing various bugs in the process. These have led to small changes in regional and global average values and coverage. All other processing steps for HadISDH remain identical. Users are advised to read the update document in the Docs section for full details. \r\n\r\nAs in previous years, the annual scrape of NOAA’s Integrated Surface Dataset for HadISD.3.1.0.2019f, which is the basis of HadISDH.land, has pulled through some historical changes to stations. This, and the additional year of data, results in small changes to station selection. There has been an issue with data for April 2015 whereby it is missing for most of the globe. This will hopefully be resolved by next year’s update. The homogeneity adjustments differ slightly due to sensitivity to the addition and loss of stations, historical changes to stations previously included and the additional 12 months of data.\r\n\r\nTo keep informed about updates, news and announcements follow the HadOBS team on twitter @metofficeHadOBS.\r\n\r\nFor more detailed information e.g bug fixes, routine updates and other exploratory analysis, see the HadISDH blog: http://hadisdh.blogspot.co.uk/\r\n\r\nReferences:\r\n\r\nWhen using the dataset in a paper please cite the following papers (see Docs for link to the publications) and this dataset (using the \"citable as\" reference):\r\n\r\nWillett, K. M., Dunn, R. J. H., Thorne, P. W., Bell, S., de Podesta, M., Parker, D. E., Jones, P. D., and Williams Jr., C. N.: HadISDH land surface multi-variable humidity and temperature record for climate monitoring, Clim. Past, 10, 1983-2006, doi:10.5194/cp-10-1983-2014, 2014.\r\n\r\nDunn, R. J. H., et al. 2016: Expanding HadISD: quality-controlled, sub-daily station data from 1931, Geoscientific Instrumentation, Methods and Data Systems, 5, 473-491.\r\n\r\nSmith, A., N. Lott, and R. Vose, 2011: The Integrated Surface Database: Recent Developments and Partnerships. Bulletin of the American Meteorological Society, 92, 704–708, doi:10.1175/2011BAMS3015.1\r\n\r\nWe strongly recommend that you read these papers before making use of the data, more detail on the dataset can be found in an earlier publication:\r\n\r\nWillett, K. M., Williams Jr., C. N., Dunn, R. J. H., Thorne, P. W., Bell, S., de Podesta, M., Jones, P. D., and Parker D. E., 2013: HadISDH: An updated land surface specific humidity product for climate monitoring. Climate of the Past, 9, 657-677, doi:10.5194/cp-9-657-2013.",
    "keywords": "HadISDH, humidity, surface, land, gridded, station, specific humidity, temperature, dew point temperature, wet bulb temperature, dew point temperature, vapour pressure, in-situ",
    "publicationState": "citable",
    "dataPublishedTime": "2020-06-29T11:40:00",
    "doiPublishedTime": "2020-08-05T10:42:29",
    "updateFrequency": "notPlanned",
    "status": "superseded",
    "result_field": {
        "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/30620/?format=api",
        "dataPath": "/badc/ukmo-hadobs/data/insitu/MOHC/HadOBS/HadISDH/mon/HadISDHTable/r1/v4-2-0-2019f/",
        "oldDataPath": [],
        "storageLocation": "internal",
        "storageStatus": "online",
        "volume": 359985321,
        "numberOfFiles": 29,
        "fileFormat": "These data are provided in NetCDF and ASCII formats, descriptors of the file formats are included in Docs."
    },
    "timePeriod": "https://api.catalogue.ceda.ac.uk/api/v2/times/8311/?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/1050/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12353/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12354/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12357/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12360/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12361/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12362/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12375/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12376/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12385/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12386/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12387/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/12388/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29013/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29014/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29015/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29017/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29020/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29023/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29024/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29025/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29026/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29027/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29028/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29029/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29031/?format=api",
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        "https://api.catalogue.ceda.ac.uk/api/v2/phenomona/29035/?format=api"
    ],
    "dataLineage": "HadISDH-land is a global land surface (~2 m) humidity dataset and is produced by the Met Office Hadley Centre in collaboration with Maynooth University, NOAA NCEI, NPL and CRU. It is based on the quality controlled sub-daily HadISD from the Met Office Hadley Centre which is in turn based on the ISD dataset from NOAA's NCEI. It is passed to CEDA for archiving and distribution.",
    "removedDataTime": null,
    "removedDataReason": "",
    "language": "English",
    "identifier_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/identifiers/10742/?format=api"
    ],
    "projects": [
        "https://api.catalogue.ceda.ac.uk/api/v2/projects/13164/?format=api"
    ],
    "observationcollection_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/observationcollections/13522/?format=api"
    ],
    "responsiblepartyinfo_set": [
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/130893/?format=api",
        "https://api.catalogue.ceda.ac.uk/api/v2/rpis/130894/?format=api",
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    ],
    "procedureAcquisition": null,
    "procedureCompositeProcess": null,
    "procedureComputation": "https://api.catalogue.ceda.ac.uk/api/v2/computations/13526/?format=api",
    "permissions": [
        {
            "ob_id": "https://api.catalogue.ceda.ac.uk/api/v2/observations/2561/?format=api",
            "useLimitation": null,
            "accessConstraints": null,
            "accessCategory": "public",
            "accessRoles": null,
            "label": "public: None group",
            "licenceURL": "http://www.nationalarchives.gov.uk/doc/non-commercial-government-licence/version/2/",
            "licenceClassifications": "personal, academic, policy"
        }
    ],
    "discoveryKeywords": [
        {
            "ob_id": 1138,
            "name": "NDGO0003"
        }
    ]
}