Links and Resources

4. WCS Requests

Let´s exlore the WCS of Swiss open Government data. WCS has an URL http://wms.zh.ch/DEMWCS

To initiate a sequence of WCS requests, a client should first issue a GetCapabilities request to the server to obtain an up-to-date listing of available data.

http://wms.zh.ch/DEMWCS?SERVICE=WCS&Request=GetCapabilities

Then a client may issue a DescribeCoverage request to obtain more details about the particular coverages offered. In response to a DescribeCoverage request, a WCS returns an XML document whose top-level element is a CoverageDescription containing CoverageOffering elements for all coverages requested.

http://wms.zh.ch/DEMWCS?service=WCS&request=DescribeCoverage&version=1.1.1&СoverageId=dtm2014

The information obtained from a DescribeCoverage request can then be used in GetCoverage requests to retrieve spatial subsets of the coverage offerings, by requesting intervals along the parameter axis.

To retrieve a coverage, or a part thereof, a client issues a GetCoverage request. A GetCoverage request returns values or properties at regularly spaced locations, bundled in the requested format. The response to a valid GetCoverage request is a coverage extract, with the spatial reference system, bounding box, size, value sets, and format specified in the request. An invalid GetCoverage request generates an error output in the requested Exceptions format.

Use QGIS WCS in order to open getcoverage and add on yoour map.