View source for WCS Describe Coverage Document For Cubes

{{WCS Glossary
|Glossary Domain=WCS
|TermDesc=This document is the detailed description of a WCS coverage. It lists the geo and time dimensions of the coverage, fields, additional dimensions of the fields, and field information like units. The [[Capabilities Processor]] produces this by clients request.
|Links=[[Capabilities Processor]] [[Data Configuration for Cubes]]
}}
DescribeCoverage for [http://128.252.202.19:8080/NASA?service=WCS&version=1.1.2&Request=DescribeCoverage&identifiers=modis4 NASA modis4]

    <CoverageDescription>
        <ows11:Title>MODIS4 AOT</ows11:Title>
        <ows11:Abstract>AOT at 0.55 micron for both ocean (best) and land (corrected)</ows11:Abstract>

The identifier is the machine readable key for this coverage

        <Identifier>modis4</Identifier>

* Latitude and Longitude bounds in EPSG:4326 and WGS 84 projections. This is regardless what the data projection is.

        <ows11:BoundingBox crs="urn:ogc:def:crs:EPSG::4326" dimensions="2">
            <ows11:LowerCorner>-89.9500 -179.9500</ows11:LowerCorner>
            <ows11:UpperCorner>+89.9500 +179.9500</ows11:UpperCorner>
        </ows11:BoundingBox>

* Grid bounds and size in the WGS 84 projection, it's the only currently supported projection.

        <GridCRS>
            <GridBaseCRS>urn:ogc:def:crs:OGC:2:84</GridBaseCRS>
            <GridType>urn:ogc:def:method:WCS:1.1:2dSimpleGrid</GridType>
            <GridOrigin>-179.9500 -89.9500</GridOrigin>
            <GridOffsets>+0.1000 +0.1000</GridOffsets>
            <GridCS>urn:ogc:def:cs:OGC:0.0:Grid2dSquareCS</GridCS>
        </GridCRS>

* Time dimension

        <TimePeriod>
            <BeginPosition>2001-01-01T00:00:00Z</BeginPosition>
            <EndPosition>2010-05-20T00:00:00Z</EndPosition>
            <TimeResolution>P1D</TimeResolution>
        </TimePeriod>

* Fields of Coverage, this time only one.

    <Field>

** Human Readable Title 

        <ows11:Title>Optical Depth Land And Ocean</ows11:Title>

** Machine Readable Identifier

        <Identifier>AOT</Identifier>

** Data Definition. Value can be any number, datatype is IEEE 32 bit float and no Units Of Measure.

        <Definition>
            <ows11:AnyValue/>
            <ows11:DataType>float</ows11:DataType>
            <ows11:UOM>none</ows11:UOM>
        </Definition>

** IEEE standard for not a number.

        <NullValue>nan</NullValue>

** Currently no interpolation is allowed. [http://schemas.opengis.net/wcs/1.1.0/interpolationMethods.xml List of Interpolations]

        <InterpolationMethods>
            <Default>none</Default>
        </InterpolationMethods>

    </Field>

At the very end:

* Supported Coordinate Systems, at the very end, linear lat-lon urn:ogc:def:crs:EPSG::4326 and lon-lat urn:ogc:def:crs:OGC:2:84

    <SupportedCRS>urn:ogc:def:crs:EPSG::4326</SupportedCRS>
    <SupportedCRS>urn:ogc:def:crs:OGC:2:84</SupportedCRS>

* Supported Formats: image/netcdf and application/x-netcdf are the same, netCDF-CF. There is a need to standardize this format.

    <SupportedFormat>image/netcdf</SupportedFormat>
    <SupportedFormat>application/x-netcdf</SupportedFormat>


DescribeCoverage with elevation dimension:

NRL NAAPS for [http://128.252.202.19:8080/NRL?service=WCS&version=1.1.2&Request=DescribeCoverage&identifiers=NAAPS DescribeCoverage]

    <CoverageDescription>

* Title=''NOGAPS and NAAPS fields in press coordinate''
* Abstract=none
* Identifier=NAAPS

    <ows11:Title>NOGAPS and NAAPS fields in press coordinate</ows11:Title>
    <ows11:Abstract></ows11:Abstract>
    <Identifier>NAAPS</Identifier>

* Latitude and Longitude bounds in EPSG:4326 and WGS 84 projections. This is regardless what the data projection is.

    <ows11:WGS84BoundingBox crs="urn:ogc:def:crs:OGC:2:84">
        <ows11:LowerCorner>-179.0000 -89.5000</ows11:LowerCorner>
        <ows11:UpperCorner>+180.0000 +89.5000</ows11:UpperCorner>
    </ows11:WGS84BoundingBox>

* Grid bounds and size in the WGS 84 projection, it's the only currently supported projection.

    <GridCRS>
        <GridBaseCRS>urn:ogc:def:crs:OGC:2:84</GridBaseCRS>
        <GridType>urn:ogc:def:method:WCS:1.1:2dSimpleGrid</GridType>
        <GridOrigin>-179.0000 -89.5000</GridOrigin>
        <GridOffsets>+1.0000 +1.0000</GridOffsets>
        <GridCS>urn:ogc:def:cs:OGC:0.0:Grid2dSquareCS</GridCS>
    </GridCRS>

* Time dimension

    <TimePeriod>
        <BeginPosition>2007-05-09T00:00:00Z</BeginPosition>
        <EndPosition>2007-05-20T00:00:00Z</EndPosition>
        <TimeResolution>PT6H</TimeResolution>
    </TimePeriod>

* Fields of Coverage. The example is the second on the list.

    <Field>

** Human Readable Title 

        <ows11:Title>specific humidity - nogaps</ows11:Title>

** Machine Readable Identifier

        <Identifier>sphu</Identifier>

** Data Definition. Value can be any number, datatype is IEEE 32 bit float and Units Of Measure ia g/g ratio


        <Definition>
            <ows11:AnyValue/>
            <ows11:DataType>float</ows11:DataType>
            <ows11:UOM>(g/g)</ows11:UOM>
        </Definition>

** IEEE standard for not a number.

        <NullValue>nan</NullValue>

** Currently no interpolation is allowed. [http://schemas.opengis.net/wcs/1.1.0/interpolationMethods.xml List of Interpolations]

        <InterpolationMethods>
            <Default>none</Default>
        </InterpolationMethods>

** Elevation dimension, values from 1000 to 10 mbar.

        <Axis identifier="elev">
            <ows11:Title>elevation</ows11:Title>
            <AvailableKeys>
                <Key>1000.0</Key>
                <Key>975.0</Key>
                <Key>950.0</Key>
                ....
                <Key>20.0</Key>
                <Key>10.0</Key>
            </AvailableKeys>

** Human readable meaning of the axis. The netCDF-CF has axiscode "Z" for elevation and depth dimension, so we use it.

            <ows11:Meaning>Z</ows11:Meaning>

** Type and Units Of Measure

            <ows11:DataType>double</ows11:DataType>
            <ows11:UOM>mbar</ows11:UOM>
        </Axis>
    </Field>