WCS Vendor Parameters¶
WCS vendor parameters are non-standard request parameters that are defined by an implementation to provide enhanced capabilities.
General Vendor Options¶
These vendor options are available for all operations.
content-disposition parameter directs how a web browser directed to handle returned content. The syntax is:
content-disposition =attachment to direct the browser to save the content to disk.
content-disposition=inline asks the browser to display the content. Note this may present performance issues when asked to display very large content.
filename parameter provides a suggested filename when a browser saves a file (e.g. to Downloads folder). The syntax is:
An example of filename use is:
When service output is saved as a file, the vendor-option
filename is used to provide the file name used.
Requests to the WCS GetCapabilities operation can be filtered to only return layers corresponding to a particular namespace.
Using an invalid namespace prefix will not cause any errors, but the document returned will not contain information on any layers.
cql_filter parameter is similar to same named WMS parameter, and allows expressing a filter using ECQL (Extended Common Query Language).
The filter is sent down into readers exposing a
Filter read parameter.
For example, assume a image mosaic has a tile index with a
cloudCover percentage attribute, then it’s possible to mosaic only
granules with a cloud cover less than 10% using:
cql_filter=cloudCover < 10
sortBy parameter allows to control the order of granules being mosaicked, using the same
syntax as WFS 1.0, that is:
&sortBy=att1 A|D,att2 A|D, ...
This maps to a “SORTING” read parameter that the coverage reader might expose (image mosaic exposes such parameter).
In image mosaic, this causes the first granule found in the sorting will display on top, and then the others will follow.
Thus, to sort a scattered mosaic of satellite images so that the most recent image shows on top, and assuming the time attribute is called
ingestion in the mosaic index, the specification will be