Web Coverage Service (WCS)

A Web Coverage Service (WCS) offers multi-dimensional coverage data for access over the Internet.

The standard can be obtained from the Open Geospatial Consortiums homepage.

The following tables provide an overview over the available WCS request parameters for each operation supported by EOxServer.

GetCapabilities

Table: “WCS GetCapabilities Request Parameters” below lists all parameters that are available with Capabilities requests.

WCS GetCapabilities Request Parameters

Parameter	Description / Subparameter	Allowed value(s) / Example	Mandatory (M) / Optional (O)
service	Requested service	WCS	M
request	Type of request	GetCapabilities	M
acceptVersions [1]	Prioritized sequence of one or more specification versions accepted by the client, with preferred versions listed first (first supported version will be used) version1[,version2[,…]]	2.0.1, 1.1.2, 1.0.0	O
sections	Comma-separated unordered list of zero or more names of zero or more names of sections of service metadata document to be returned in service metadata document. Request only certain sections of Capabilities Document section1[,section2[,…]]	DatasetSeriesSummary CoverageSummary Contents All ServiceIdentification ServiceProvider OperationsMetadata Languages	O
updateSequence	Date of last issued GetCapabilities request; to receive new document only if it has changed since	“2013-05-08”	O

DescribeCoverage

Table: “WCS DescribeCoverage Request Parameters” below lists all parameters that are available with DescribeCoverage requests.

WCS DescribeCoverage Request Parameters

Parameter	Description / Subparameter	Allowed value(s) / Example	Mandatory (M) / Optional (O)
service	Requested service	WCS	M
request	Type of request	DescribeCoverage	M
version [1]	Version number	2.0.1	M
coverageId	NCName(s): valid coverageID of a Dataset valid coverageID of a StichedMosaic		M

DescribeEOCoverageSet

Table: “EO-WCS DescribeEOCoverageSet Request Parameters” below lists all parameters that are available with DescribeEOCoverageSet requests.

EO-WCS DescribeEOCoverageSet Request Parameters

Parameter	Description / Subparameter	Allowed value(s) / Example	Mandatory (M) / Optional (O)
service	Requested service	WCS	M
request	Type of request	DescribeEOCoverageSet	M
version [1]	Version number	2.0.1	M
eoId	Valid eoId: using the coverageId of a Datatset using the eoId of a DatatsetSeries using the coverageId of a StitchedMosaic		M
subset	Allows to constrain the request in each dimensions and define how these parameters are applied. The spatial constraint is expressed in WGS84, the temporal constraint in ISO 8601. Spatial trimming: Name of an coverage axis (Long or Lat) Temporal trimming: phenomenonTime Plus optional either: containment = overlaps (default) containment = contains Any combination thereof (but each value only once per request)	Lat(32,47) Long(11,33) phenomenonTime(“2006-08-01”, “2006-08-22T09:22:00Z”) Lat(32,47)&Long(11,33)& phenomenonTime(“2006-08-01”& “2006-08-22T09:22:00Z”)& containment=contains	O
containment	see subset parameter	overlaps (default) contains	O
section	see GetCapabilities	DatasetSeriesSummary CoverageSummary All	O
count	Limits the maximum number of DatasetDescriptions returned in the EOCoverageSetDescription.	10	O

GetCoverage

Table: “EO-WCS GetCoverage Request Parameters” below lists all parameters that are available with GetCoverage requests.

EO-WCS GetCoverage Request Parameters

Parameter	Description / Subparameter	Allowed value(s) / Example	Mandatory (M) / Optional (O)
service	Requested service	WCS	M
request	Type of request	GetCoverage	M
version [1]	Version number	2.0.1	M
coverageId	NCName(s): valid coverageID of a Dataset valid coverageID of a StichedMosaic		M
format	Requested format of coverage to be returned. By default the coverage is returned in its original format.	image/tiff	O
mediatype	Coverage delivered directly as image file or enclosed in GML structure not present or multipart/mixed	multipart/mixed	O
subset	Trimming of coverage dimension (no slicing allowed!) the label of a coverage axis The meaning of the subset can be altered by the subsettingCrs parameter.	x(400,200) Lat(12,14) Long(17,17.4)	O
subsettingCrs	The CRS the subsets are expressed in. This also defines the output CRS, if no further outputCrs is specified. If no subsettingCrs is given, pixel coordinates are assumed.	http://www.opengis.net/def/crs/ EPSG/0/4326	O
outputCrs	CRS for the requested output coverage not present or CRS	http://www.opengis.net/def/crs/ EPSG/0/3035	O
rangesubset	Subsetting in the range domain (e.g. Band-Subsetting).	Blue,Green,Red Band1:Band3,Band5,Band7:Band9	O
scaleFactor	Scale the output by this factor. The ‘scaleFactor’ parameter requires MapServer v7.0.	0.5 1.25	O
scaleAxes scaleSize scaleExtent	Mutually exclusive per axis, either: a scale factor (per axis) absolute pixel size as integer (per axis) the size given as extent (per axis). This is internally translated to a ‘scaleSize’ The ‘scaleAxes’ parameter requires MapServer v7.0.	scaleAxes=x(1.5),y(0.5) scaleSize=x(50),y(100) scaleExtent=long(50:100)	O
interpolation [2]	Interpolation method to be used http://www.opengis.net/def/interpolation/OGC/1/ nearest-neighbour (default) http://www.opengis.net/def/interpolation/OGC/1/ average http://www.opengis.net/def/interpolation/OGC/1/ bilinear	bilinear	O
geotiff:compression [3]	The internal compression method used. One of: None PackBits Huffman LZW JPEG Deflate	LZW	O
geotiff:jpeg_quality [3]	The quality of the JPEG compression when this compression method is used. Must be an integer between 1 and 100.	75	O
geotiff:predictor [3]	The predictor method used for the Deflate or LZW compression. One of: None Horizontal FloatingPoint	Horizontal	O
geotiff:interleave [3]	Defines how the output image shall be interleaved. One of: Pixel Band	Horizontal	O
geotiff:tiling [3]	Defines whether or not the image shall be internally tiled. Must be a boolean value (true/false). If this is set to ‘true’, also a tilewidth and tileheight must be specified.	true	O
geotiff:tilewidth [3]	Defines the width of the internal tiles. Must be an integer and a multiple of 16.	256	O
geotiff:tileheight [3]	Defines the height of the internal tiles. Must be an integer and a multiple of 16.	128	O

[1] (1,2,3,4)

Version, acceptVersions: Support for EO-WCS is available only together with WCS version 2.0.1.

[2]

Interpolation: (Note: Resampling options other than NEAREST can dramatically slow down raster processing). The default (and fastest) is NEAREST. Replaces the target pixel with its NEAREST Neighbor. AVERAGE will compute the average pixel value of all pixels in the region of the disk file being mapped to the output pixel (or possibly just a sampling of them). Generally AVERAGE can be desirable for reducing noise in dramatically downsampled data, and can give something approximating anti-aliasing for black and white linework. BILINEAR will compute a linear interpolation of the four pixels around the target location. BILINEAR can be helpful when oversampling data to give a smooth appearance.

[3] (1,2,3,4,5,6,7)

These parameters are only used in conjunction with GeoTIFF output. Thus the format parameter must be either ‘image/tiff’ or the “native” format of the coverage maps to GeoTIFF. The specificaiton of this encoding extension can be found here