Hyrax JSON

From OPeNDAP Documentation

1 Overview

With funding from the Australian Bureau of Meteorology we have developed prototype JSON data and metadata responses for Hyrax. After reviewing some the existing JSON encodings for DAP content we chose to implement two prototype encodings.

The first, and most likely the most useful, is based on the w10n specification as realized by the good folks at JPL. This encoding utilizes an abstract model to capture the structure of the dataset and it's metadata. In this model the properties of the JSON object are made of a controlled vocabulary. This means that clients utilizing these responses can always "know" what to look for in each returned object. No matter what dataset is being accessed the client has a consistent mechanism for extracting variable names and values.

The second encoding utilizes an "instance" representation model wherein the datasets variable names are used to create the properties of the returned object. This means that each dataset potentially has a different set of properties and that client software must be written to navigate each dataset. For data providers with large sets of homogeneous holdings this representation allows the quick development of targeted clients that can work with these data. However since the variable names form the dataset become JSON properties there is no promise that the JSON objects will actually be valid as variable names in DAP datasets have few content restriction and the JSON property names must be valid Javascript variable names. Because of this this second representation probably doesn't have the required flexibility to become an official JSON representation for the DAP.

The intention is to develop this work (in particular the w10n representation) into a DAP4 extension that defines the JSON representation for the DAP4 data and metadata responses.


2 Details

2.1 Data Type Transform

w10n
The w10n data model views the world as a directed graph of nodes and leaves. This view starts at the catalog level and continues into the structure of the datasets.
  • Only leaves are allowed to have data.
  • Both nodes and leaves have metadata (attributes).
  • Leaf data must be transmittable as either a single value, or an N-dimensional array of values, of a simple type.
Simple Types
f - Floating point value

This means that only DAP arrays of simple types and instances of simple types may be represented as leaves. Everything else must be a node.

Since the DAP data model also can be seen as a directed graph the mapping is nearly complete.

  • There may be incomplete matching with type space of the simple types supported in both models.
Simple Types Type Map
DAP Type w10n Type
Byte
Int16
UInt16
Int32
UInt32
Float32 f
Float64
String
Url

(Needed: A complete type list from w10n - In section 5.2.2 of the w10n spec. the type property for the leaf response is identified but there is no listing of the allowed values presented. We are expecting to get this information from JPL by 08/18/2014 at which point I will complete this section and update the code to reflect the mapping as stated here.)

2.1.1 Unmapped Types

  • The DAP allows arrays of complex types like structures and grids. No w10n representation for this if offered.

2.2 Navigation

W10n defines a navigation component that allows the user to traverse the directed graph of a collection of dataset holdings on the server. This work is focused not on implementing the collection navigation aspects of the w10n standard but rather on the JSON data and metadata representations. Thus, DAP request URLs (and alternately HTTP Accepts headers received from the requesting client) are used here to solicit JSON encoded responses from the server. The use of DAP constraint expressions (i.e. query strings) in the regular DAP manner in conjunction with the DAP URL will have the typical effects on the result. Subsetting by index, selection of variables, and subsetting by value (where supported) will control what variables and what parts of variables will be returned in the response.

3 Installation

The JSON functionality is implemented as components of the OLFS and the BES. The OLFS JSON code is built into the OLFS and is not an add-on. In the BES the JSON support is contained in the fileout_json module. The file out_json module is now part of the Hyrax trunk (the shrew project) and part of the Hyrax-1.9 release branch. The next minor release of the Hyrax server will contain the JSON response capability.

3.1 From subversion trunk

3.2 From the Hyrax-1.9 release branch


4 Soliciting the JSON response

Let datasetUrl=http://test.opendap.org/opendap/data/nc/coads_climatology.nc

4.1 DAP4 requests

Using the DAP4 URLs to request both the DMR and the Data responses in a JSON encoding.

NB: Currently what is returned is really a JSON encoding of the DAP data (.dods) and metadata (.ddx) objects. When we have full DAP4 within Hyrax these responses will return JSON version of the DAP4 DMR and Data objects.


DAP4 w10n JSON Metadata request
datasetUrl.dmr.json
DAP4 w10n JSON Data request
datasetUrl.dap.json
DAP4 Instance Object Metadata request
datasetUrl.dmr.ijsn
DAP4 Instance Object Data request
datasetUrl.dap.ijsn

4.2 DAP2 requests

DAP2 w10n JSON Data request
Entire Dataset
datasetUrl.json
Just the variable named "COADSX"
datasetUrl.json?COADSX
DAP2 Instance Object JSON Data request
Entire Dataset
datasetUrl.ijsn
Just the variable named "COADSX"
datasetUrl.ijsn?COADSX

5 Examples

5.1 Dataset - coads_climatology.nc

(I'm putting in the DAP2 dataset descriptions for now, the DAP4 will follow)

5.1.1 DDS

Here is the DDS for the grid dataset, our friend coads_climatology.nc:

Dataset {
    Float64 COADSX[COADSX = 180];
    Float64 COADSY[COADSY = 90];
    Float64 TIME[TIME = 12];
    Grid {
      Array:
        Float32 SST[TIME = 12][COADSY = 90][COADSX = 180];
      Maps:
        Float64 TIME[TIME = 12];
        Float64 COADSY[COADSY = 90];
        Float64 COADSX[COADSX = 180];
    } SST;
    Grid {
      Array:
        Float32 AIRT[TIME = 12][COADSY = 90][COADSX = 180];
      Maps:
        Float64 TIME[TIME = 12];
        Float64 COADSY[COADSY = 90];
        Float64 COADSX[COADSX = 180];
    } AIRT;
    Grid {
      Array:
        Float32 UWND[TIME = 12][COADSY = 90][COADSX = 180];
      Maps:
        Float64 TIME[TIME = 12];
        Float64 COADSY[COADSY = 90];
        Float64 COADSX[COADSX = 180];
    } UWND;
    Grid {
      Array:
        Float32 VWND[TIME = 12][COADSY = 90][COADSX = 180];
      Maps:
        Float64 TIME[TIME = 12];
        Float64 COADSY[COADSY = 90];
        Float64 COADSX[COADSX = 180];
    } VWND;
} coads_climatology.nc;


5.1.2 DAS

Attributes {
    COADSX {
        String units "degrees_east";
        String modulo " ";
        String point_spacing "even";
    }
    COADSY {
        String units "degrees_north";
        String point_spacing "even";
    }
    TIME {
        String units "hour since 0000-01-01 00:00:00";
        String time_origin "1-JAN-0000 00:00:00";
        String modulo " ";
    }
    SST {
        Float32 missing_value -9.99999979e+33;
        Float32 _FillValue -9.99999979e+33;
        String long_name "SEA SURFACE TEMPERATURE";
        String history "From coads_climatology";
        String units "Deg C";
    }
    AIRT {
        Float32 missing_value -9.99999979e+33;
        Float32 _FillValue -9.99999979e+33;
        String long_name "AIR TEMPERATURE";
        String history "From coads_climatology";
        String units "DEG C";
    }
    UWND {
        Float32 missing_value -9.99999979e+33;
        Float32 _FillValue -9.99999979e+33;
        String long_name "ZONAL WIND";
        String history "From coads_climatology";
        String units "M/S";
    }
    VWND {
        Float32 missing_value -9.99999979e+33;
        Float32 _FillValue -9.99999979e+33;
        String long_name "MERIDIONAL WIND";
        String history "From coads_climatology";
        String units "M/S";
    }
    NC_GLOBAL {
        String history "FERRET V4.30 (debug/no GUI) 15-Aug-96";
    }
    DODS_EXTRA {
        String Unlimited_Dimension "TIME";
    }
}

5.1.3 DDX

<?xml version="1.0" encoding="ISO-8859-1"?>
<Dataset name="coads_climatology.nc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xml.opendap.org/ns/DAP/3.2# http://xml.opendap.org/dap/dap3.2.xsd" xmlns:grddl="http://www.w3.org/2003/g/data-view#" grddl:transformation="http://xml.opendap.org/transforms/ddxToRdfTriples.xsl" xmlns="http://xml.opendap.org/ns/DAP/3.2#" xmlns:dap="http://xml.opendap.org/ns/DAP/3.2#" dapVersion="3.2" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:base="http://test.opendap.org/opendap/data/nc/coads_climatology.nc">
    <Attribute name="NC_GLOBAL" type="Container">
        <Attribute name="history" type="String">
            <value>FERRET V4.30 (debug/no GUI) 15-Aug-96</value>
        </Attribute>
    </Attribute>
    <Attribute name="DODS_EXTRA" type="Container">
        <Attribute name="Unlimited_Dimension" type="String">
            <value>TIME</value>
        </Attribute>
    </Attribute>
    <Array name="COADSX">
        <Attribute name="units" type="String">
            <value>degrees_east</value>
        </Attribute>
        <Attribute name="modulo" type="String">
            <value> </value>
        </Attribute>
        <Attribute name="point_spacing" type="String">
            <value>even</value>
        </Attribute>
        <Float64/>
        <dimension name="COADSX" size="180"/>
    </Array>
    <Array name="COADSY">
        <Attribute name="units" type="String">
            <value>degrees_north</value>
        </Attribute>
        <Attribute name="point_spacing" type="String">
            <value>even</value>
        </Attribute>
        <Float64/>
        <dimension name="COADSY" size="90"/>
    </Array>
    <Array name="TIME">
        <Attribute name="units" type="String">
            <value>hour since 0000-01-01 00:00:00</value>
        </Attribute>
        <Attribute name="time_origin" type="String">
            <value>1-JAN-0000 00:00:00</value>
        </Attribute>
        <Attribute name="modulo" type="String">
            <value> </value>
        </Attribute>
        <Float64/>
        <dimension name="TIME" size="12"/>
    </Array>
    <Grid name="SST">
        <Array name="SST">
            <Attribute name="missing_value" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="_FillValue" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="long_name" type="String">
                <value>SEA SURFACE TEMPERATURE</value>
            </Attribute>
            <Attribute name="history" type="String">
                <value>From coads_climatology</value>
            </Attribute>
            <Attribute name="units" type="String">
                <value>Deg C</value>
            </Attribute>
            <Float32/>
            <dimension name="TIME" size="12"/>
            <dimension name="COADSY" size="90"/>
            <dimension name="COADSX" size="180"/>
        </Array>
        <Map name="TIME">
            <Attribute name="units" type="String">
                <value>hour since 0000-01-01 00:00:00</value>
            </Attribute>
            <Attribute name="time_origin" type="String">
                <value>1-JAN-0000 00:00:00</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Float64/>
            <dimension name="TIME" size="12"/>
        </Map>
        <Map name="COADSY">
            <Attribute name="units" type="String">
                <value>degrees_north</value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSY" size="90"/>
        </Map>
        <Map name="COADSX">
            <Attribute name="units" type="String">
                <value>degrees_east</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSX" size="180"/>
        </Map>
    </Grid>
    <Grid name="AIRT">
        <Array name="AIRT">
            <Attribute name="missing_value" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="_FillValue" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="long_name" type="String">
                <value>AIR TEMPERATURE</value>
            </Attribute>
            <Attribute name="history" type="String">
                <value>From coads_climatology</value>
            </Attribute>
            <Attribute name="units" type="String">
                <value>DEG C</value>
            </Attribute>
            <Float32/>
            <dimension name="TIME" size="12"/>
            <dimension name="COADSY" size="90"/>
            <dimension name="COADSX" size="180"/>
        </Array>
        <Map name="TIME">
            <Attribute name="units" type="String">
                <value>hour since 0000-01-01 00:00:00</value>
            </Attribute>
            <Attribute name="time_origin" type="String">
                <value>1-JAN-0000 00:00:00</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Float64/>
            <dimension name="TIME" size="12"/>
        </Map>
        <Map name="COADSY">
            <Attribute name="units" type="String">
                <value>degrees_north</value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSY" size="90"/>
        </Map>
        <Map name="COADSX">
            <Attribute name="units" type="String">
                <value>degrees_east</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSX" size="180"/>
        </Map>
    </Grid>
    <Grid name="UWND">
        <Array name="UWND">
            <Attribute name="missing_value" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="_FillValue" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="long_name" type="String">
                <value>ZONAL WIND</value>
            </Attribute>
            <Attribute name="history" type="String">
                <value>From coads_climatology</value>
            </Attribute>
            <Attribute name="units" type="String">
                <value>M/S</value>
            </Attribute>
            <Float32/>
            <dimension name="TIME" size="12"/>
            <dimension name="COADSY" size="90"/>
            <dimension name="COADSX" size="180"/>
        </Array>
        <Map name="TIME">
            <Attribute name="units" type="String">
                <value>hour since 0000-01-01 00:00:00</value>
            </Attribute>
            <Attribute name="time_origin" type="String">
                <value>1-JAN-0000 00:00:00</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Float64/>
            <dimension name="TIME" size="12"/>
        </Map>
        <Map name="COADSY">
            <Attribute name="units" type="String">
                <value>degrees_north</value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSY" size="90"/>
        </Map>
        <Map name="COADSX">
            <Attribute name="units" type="String">
                <value>degrees_east</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSX" size="180"/>
        </Map>
    </Grid>
    <Grid name="VWND">
        <Array name="VWND">
            <Attribute name="missing_value" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="_FillValue" type="Float32">
                <value>-9.99999979e+33</value>
            </Attribute>
            <Attribute name="long_name" type="String">
                <value>MERIDIONAL WIND</value>
            </Attribute>
            <Attribute name="history" type="String">
                <value>From coads_climatology</value>
            </Attribute>
            <Attribute name="units" type="String">
                <value>M/S</value>
            </Attribute>
            <Float32/>
            <dimension name="TIME" size="12"/>
            <dimension name="COADSY" size="90"/>
            <dimension name="COADSX" size="180"/>
        </Array>
        <Map name="TIME">
            <Attribute name="units" type="String">
                <value>hour since 0000-01-01 00:00:00</value>
            </Attribute>
            <Attribute name="time_origin" type="String">
                <value>1-JAN-0000 00:00:00</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Float64/>
            <dimension name="TIME" size="12"/>
        </Map>
        <Map name="COADSY">
            <Attribute name="units" type="String">
                <value>degrees_north</value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSY" size="90"/>
        </Map>
        <Map name="COADSX">
            <Attribute name="units" type="String">
                <value>degrees_east</value>
            </Attribute>
            <Attribute name="modulo" type="String">
                <value> </value>
            </Attribute>
            <Attribute name="point_spacing" type="String">
                <value>even</value>
            </Attribute>
            <Float64/>
            <dimension name="COADSX" size="180"/>
        </Map>
    </Grid>
    <blob href="cid:"/>
</Dataset>

5.1.4 DMR

Coming Soon... ====

5.2 w10n JSON (Abstract Model)

5.2.1 Metadata Responses

5.2.1.1 Single Variable Selection
DAP4 Request URL
datasetURL.dmr.json?dap4.ce=COADSX
Response
{
  "name": "coads_climatology.nc",
  "attributes": [
    {
      "name": "NC_GLOBAL",
      "attributes": [
        {"name": "history", "value": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]}
      ]
    },
    {
      "name": "DODS_EXTRA",
      "attributes": [
        {"name": "Unlimited_Dimension", "value": ["TIME"]}
      ]
    }
  ],
  "leaves": [
    {
      "name": "COADSX",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["degrees_east"]},
        {"name": "modulo", "value": [" "]},
        {"name": "point_spacing", "value": ["even"]}
      ],
      "shape": [180]
    }
  ],
  "nodes": []
}
5.2.1.2 Entire Dataset
DAP4 Request URL
datasetURL.dmr.json
Response
{
  "name": "coads_climatology.nc",
  "attributes": [
    {
      "name": "NC_GLOBAL",
      "attributes": [
        {"name": "history", "value": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]}
      ]
    },
    {
      "name": "DODS_EXTRA",
      "attributes": [
        {"name": "Unlimited_Dimension", "value": ["TIME"]}
      ]
    }
  ],
  "leaves": [
    {
      "name": "COADSX",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["degrees_east"]},
        {"name": "modulo", "value": [" "]},
        {"name": "point_spacing", "value": ["even"]}
      ],
      "shape": [180]
    },
    {
      "name": "COADSY",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["degrees_north"]},
        {"name": "point_spacing", "value": ["even"]}
      ],
      "shape": [90]
    },
    {
      "name": "TIME",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
        {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
        {"name": "modulo", "value": [" "]}
      ],
      "shape": [12]
    }
  ],
  "nodes": [
    {
      "name": "SST",
      "attributes": [],
      "leaves": [
        {
          "name": "SST",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["SEA SURFACE TEMPERATURE"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["Deg C"]}
          ],
          "shape": [12,90,180]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180]
        }
      ],
      "nodes": []
    }
    {
      "name": "AIRT",
      "attributes": [],
      "leaves": [
        {
          "name": "AIRT",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["AIR TEMPERATURE"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["DEG C"]}
          ],
          "shape": [12,90,180]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180]
        }
      ],
      "nodes": []
    }
    {
      "name": "UWND",
      "attributes": [],
      "leaves": [
        {
          "name": "UWND",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["ZONAL WIND"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["M/S"]}
          ],
          "shape": [12,90,180]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180]
        }
      ],
      "nodes": []
    }
    {
      "name": "VWND",
      "attributes": [],
      "leaves": [
        {
          "name": "VWND",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["MERIDIONAL WIND"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["M/S"]}
          ],
          "shape": [12,90,180]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180]
        }
      ],
      "nodes": []
    }

  ]
}

5.2.2 Data Responses

5.2.2.1 Single Variable Selection
DAP4 Request URL
datasetURL.dap.json?dap4.ce=COADSX
DAP2 Request URL
datasetURL.json?COADSX
Response
{
  "name": "coads_climatology.nc",
  "attributes": [
    {
      "name": "NC_GLOBAL",
      "attributes": [
        {"name": "history", "value": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]}
      ]
    },
    {
      "name": "DODS_EXTRA",
      "attributes": [
        {"name": "Unlimited_Dimension", "value": ["TIME"]}
      ]
    }
  ],
  "leaves": [
    {
      "name": "COADSX",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["degrees_east"]},
        {"name": "modulo", "value": [" "]},
        {"name": "point_spacing", "value": ["even"]}
      ],
      "shape": [180],
      "data": [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
    }
  ],
  "nodes": []
}
5.2.2.2 Entire Dataset
DAP4 Request URL
datasetURL.dap.json
DAP2 Request URL
datasetURL.json
Response
{
  "name": "coads_climatology.nc",
  "attributes": [
    {
      "name": "NC_GLOBAL",
      "attributes": [
        {"name": "history", "value": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]}
      ]
    },
    {
      "name": "DODS_EXTRA",
      "attributes": [
        {"name": "Unlimited_Dimension", "value": ["TIME"]}
      ]
    }
  ],
  "leaves": [
    {
      "name": "COADSX",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["degrees_east"]},
        {"name": "modulo", "value": [" "]},
        {"name": "point_spacing", "value": ["even"]}
      ],
      "shape": [180],
      "data": [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
    },
    {
      "name": "COADSY",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["degrees_north"]},
        {"name": "point_spacing", "value": ["even"]}
      ],
      "shape": [90],
      "data": [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89]
    },
    {
      "name": "TIME",
      "type": "f",
      "attributes": [
        {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
        {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
        {"name": "modulo", "value": [" "]}
      ],
      "shape": [12],
      "data": [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33]
    }
  ],
  "nodes": [
    {
      "name": "SST",
      "attributes": [],
      "leaves": [
        {
          "name": "SST",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["SEA SURFACE TEMPERATURE"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["Deg C"]}
          ],
          "shape": [12,90,180],
          "data": [[[-1e+34, -1e+34, -1e+34, … (many values skipped for brevity),  -1e+34, -1e+34, -1e+34]]]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12],
          "data": [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90],
          "data": [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180],
          "data": [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
        }
      ],
      "nodes": []
    }
    {
      "name": "AIRT",
      "attributes": [],
      "leaves": [
        {
          "name": "AIRT",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["AIR TEMPERATURE"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["DEG C"]}
          ],
          "shape": [12,90,180],
          "data": [[[-1e+34, -1e+34, -1e+34, … (many values skipped for brevity),  -1e+34, -1e+34, -1e+34]]]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12],
          "data": [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90],
          "data": [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180],
          "data": [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
        }
      ],
      "nodes": []
    }
    {
      "name": "UWND",
      "attributes": [],
      "leaves": [
        {
          "name": "UWND",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["ZONAL WIND"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["M/S"]}
          ],
          "shape": [12,90,180],
          "data": [[[-1e+34, -1e+34, -1e+34, … (many values skipped for brevity),  -1e+34, -1e+34, -1e+34]]]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12],
          "data": [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90],
          "data": [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180],
          "data": [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
        }
      ],
      "nodes": []
    }
    {
      "name": "VWND",
      "attributes": [],
      "leaves": [
        {
          "name": "VWND",
          "type": "f",
          "attributes": [
            {"name": "missing_value", "value": [-9.99999979e+33]},
            {"name": "_FillValue", "value": [-9.99999979e+33]},
            {"name": "long_name", "value": ["MERIDIONAL WIND"]},
            {"name": "history", "value": ["From coads_climatology"]},
            {"name": "units", "value": ["M/S"]}
          ],
          "shape": [12,90,180],
          "data": [[[-1e+34, -1e+34, -1e+34, … (many values skipped for brevity),  -1e+34, -1e+34, -1e+34]]]
        },
        {
          "name": "TIME",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["hour since 0000-01-01 00:00:00"]},
            {"name": "time_origin", "value": ["1-JAN-0000 00:00:00"]},
            {"name": "modulo", "value": [" "]}
          ],
          "shape": [12],
          "data": [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33]
        },
        {
          "name": "COADSY",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_north"]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [90],
          "data": [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89]
        },
        {
          "name": "COADSX",
          "type": "f",
          "attributes": [
            {"name": "units", "value": ["degrees_east"]},
            {"name": "modulo", "value": [" "]},
            {"name": "point_spacing", "value": ["even"]}
          ],
          "shape": [180],
          "data": [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
        }
      ],
      "nodes": []
    }

  ]
}

5.3 Instance Model JSON

5.3.1 Metadata Responses

5.3.1.1 Single Variable Selection
DAP4 Request URL
datasetURL.dmr.ijsn?dap4.ce=COADSX
Response
{
 "name": "coads_climatology.nc",
 "NC_GLOBAL": {
   "history": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]
 },
 "DODS_EXTRA": {
   "Unlimited_Dimension": ["TIME"]
 },
 "COADSX":  {
   "units": ["degrees_east"],
   "modulo": [" "],
   "point_spacing": ["even"]
 }
}
5.3.1.2 Entire Dataset
DAP4 Request URL
datasetURL.dmr.ijsn
Response
{
 "name": "coads_climatology.nc",
 "NC_GLOBAL": {
   "history": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]
 },
 "DODS_EXTRA": {
   "Unlimited_Dimension": ["TIME"]
 },
 "COADSX":  {
   "units": ["degrees_east"],
   "modulo": [" "],
   "point_spacing": ["even"]
 },
 "COADSY":  {
   "units": ["degrees_north"],
   "point_spacing": ["even"]
 },
 "TIME":  {
   "units": ["hour since 0000-01-01 00:00:00"],
   "time_origin": ["1-JAN-0000 00:00:00"],
   "modulo": [" "]
 },
 "SST": {
  "SST":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["SEA SURFACE TEMPERATURE"],
    "history": ["From coads_climatology"],
    "units": ["Deg C"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 },
 "AIRT": {
  "AIRT":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["AIR TEMPERATURE"],
    "history": ["From coads_climatology"],
    "units": ["DEG C"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 },
 "UWND": {
  "UWND":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["ZONAL WIND"],
    "history": ["From coads_climatology"],
    "units": ["M/S"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 },
 "VWND": {
  "VWND":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["MERIDIONAL WIND"],
    "history": ["From coads_climatology"],
    "units": ["M/S"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 }
}
{
 "name": "coads_climatology.nc",
 "NC_GLOBAL": {
   "history": ["FERRET V4.30 (debug/no GUI) 15-Aug-96"]
 },
 "DODS_EXTRA": {
   "Unlimited_Dimension": ["TIME"]
 },
 "COADSX":  {
   "units": ["degrees_east"],
   "modulo": [" "],
   "point_spacing": ["even"]
 },
 "COADSY":  {
   "units": ["degrees_north"],
   "point_spacing": ["even"]
 },
 "TIME":  {
   "units": ["hour since 0000-01-01 00:00:00"],
   "time_origin": ["1-JAN-0000 00:00:00"],
   "modulo": [" "]
 },
 "SST": {
  "SST":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["SEA SURFACE TEMPERATURE"],
    "history": ["From coads_climatology"],
    "units": ["Deg C"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 },
 "AIRT": {
  "AIRT":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["AIR TEMPERATURE"],
    "history": ["From coads_climatology"],
    "units": ["DEG C"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 },
 "UWND": {
  "UWND":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["ZONAL WIND"],
    "history": ["From coads_climatology"],
    "units": ["M/S"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 },
 "VWND": {
  "VWND":  {
    "missing_value": [-9.99999979e+33],
    "_FillValue": [-9.99999979e+33],
    "long_name": ["MERIDIONAL WIND"],
    "history": ["From coads_climatology"],
    "units": ["M/S"]
  },
  "TIME":  {
    "units": ["hour since 0000-01-01 00:00:00"],
    "time_origin": ["1-JAN-0000 00:00:00"],
    "modulo": [" "]
  },
  "COADSY":  {
    "units": ["degrees_north"],
    "point_spacing": ["even"]
  },
  "COADSX":  {
    "units": ["degrees_east"],
    "modulo": [" "],
    "point_spacing": ["even"]
  }
 }
}

5.3.2 Data Responses

5.3.2.1 Single Variable Selection
DAP4 Request URL
datasetURL.dap.ijsn?dap4.ce=COADSX
DAP2 Request URL
datasetURL.ijsn?COADSX
Response
{
 "name": "coads_climatology.nc",
 "COADSX":  [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
}
5.3.2.2 Entire Dataset
DAP4 Request URL
datasetURL.dap.ijsn
DAP2 Request URL
datasetURL.ijsn
Response
{
 "name": "coads_climatology.nc",
 "COADSX":  [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379],
 "COADSY":  [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89],
 "TIME":  [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33],
 "SST": {
  "SST":  [[[-1e+34, -1e+34, -1e+34, … (Many values omitted for brevity), -1e+34, -1e+34, -1e+34]]],
  "TIME":  [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33],
  "COADSY":  [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89],
  "COADSX":  [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
 },
 "AIRT": {
  "AIRT":  [[[-1e+34, -1e+34, -1e+34, … (Many values omitted for brevity), -1e+34, -1e+34, -1e+34]]],
  "TIME":  [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33],
  "COADSY":  [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89],
  "COADSX":  [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
 },
 "UWND": {
  "UWND":  [[[-1e+34, -1e+34, -1e+34, … (Many values omitted for brevity), -1e+34, -1e+34, -1e+34]]],
  "TIME":  [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33],
  "COADSY":  [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89],
  "COADSX":  [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
 },
 "VWND": {
  "VWND":  [[[-1e+34, -1e+34, -1e+34, … (Many values omitted for brevity), -1e+34, -1e+34, -1e+34]]],
  "TIME":  [366, 1096.49, 1826.97, 2557.45, 3287.94, 4018.43, 4748.91, 5479.4, 6209.88, 6940.36, 7670.85, 8401.33],
  "COADSY":  [-89, -87, -85, -83, -81, -79, -77, -75, -73, -71, -69, -67, -65, -63, -61, -59, -57, -55, -53, -51, -49, -47, -45, -43, -41, -39, -37, -35, -33, -31, -29, -27, -25, -23, -21, -19, -17, -15, -13, -11, -9, -7, -5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89],
  "COADSX":  [21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379]
 }
}