[Qgis-developer] WCS

Radim Blazek radim.blazek at gmail.com
Wed May 9 11:06:40 PDT 2012

On Fri, May 4, 2012 at 3:19 PM, Marco Hugentobler
<marco.hugentobler at sourcepole.ch> wrote:
> Hi Radim
> Nice to have a WCS client in QGIS!
> If it goes via GDAL WCS driver, how does it work with Proxies (via libcurl?)
> Some poor users are sitting behind proxies, so it would be nice if the proxy
> settings from the options are applied to WCS client as well.

I forgot completely about proxies (apart getting capabilities). GDAL
WCS is using CPLHTTPFetch which should take PROXY and PROXYUSERPWD
options (>=GDAL 1.8.0) and set CURLOPT_PROXY and
do not seem to be supported.


> Regards,
> Marco
> Am 02.05.2012 12:23, schrieb Radim Blazek:
>> Thanks to financial support from T4E s.r.l http://www.t4e.it/
>> I could implement WCS support based on GDAL WCS driver.
>> It is available here: https://github.com/blazek/Quantum-GIS branch wcs
>> Because of WCS 1.1 bugs in GDAL (wrong axis order in bbox for latlong,
>> no way to specify response CRS) and Mapserver (ignores  RangeSubset)
>> we have to stick with WCS 1.0 but capabilities parser for 1.1 is
>> ready.
>> It was written with possible use of common base classes for W*S in
>> mind: new classes QgsOWSConnection, QgsOWSSourceSelect.
>> Open issues:
>> - How to pass the raster to GDAL Tools. Currently the XML string is
>> created on the fly by GDAL provider and passed as a string to
>> GDALOpen, there is no XML file which could be given to GDAL Tools.
>> - How to specify an extent and resolution in GDAL Tools.
>> - How to implement save a copy of WCS part
>> Related:
>> I believe that it could be better to organize OWS by servers instead
>> of by services, especially in the browser. Instead of adding a new
>> connection for each service, user could add just one generic OWS
>> connection and available services would appear under that connection
>> in the tree. I have implemented this in OWS meta provider. It reads
>> and combines all defined WMS, WFS and WCS connections and displays all
>> available layers (if there are few) or  services under the connection:
>> https://picasaweb.google.com/radim.blazek/OWS
>> Radim
>> _______________________________________________
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> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux&  Open Source Solutions
> Weberstrasse 5, CH-8004 Zürich, Switzerland
> marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee
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