[Qgis-developer] Re: Raster providers

Radim Blazek radim.blazek at gmail.com
Mon Jan 10 03:49:30 EST 2011

Hi Marco,
the code is quite ugly at moment, I still keep old pieces of code commented.

Regarding the reprojection, I would like to implement the approximate
reprojection (similar to mapserver you showed me) in
QgsRasterDataProvider::readBlock and overwrite it only in WMS
provider. GDAL warp is too slow (as expected) and no way to speed it


On Mon, Jan 10, 2011 at 9:36 AM, Marco Hugentobler
<marco.hugentobler at sourcepole.ch> wrote:
> Hi Radim
> Nice to see you are making good progresses with raster redesign!
> Please give the dev team a bit time to review all the changes. I'd like to
> have a closer look at the code. However, it's my first day back at work, so it
> could take a few days until I can give feedback.
> Regards,
> Marco
> Am Samstag, 8. Januar 2011, um 20.26:24 schrieb Radim Blazek:
>> Hi all,
>> new raster providers are ready for testing. The work is not yet
>> finished but all the old functionality should be available. Current
>> status:
>> - GDAL: on-the-fly reprojection via gdal warp, quite slow, I have not
>> yet implemented the trick used in Mapserver Marco pointed me to.
>> Please let me know, if you consider the speed at least acceptable for
>> real work. The speed depends especially on output display size.
>> - GRASS: all the old functionality is back, the data are provided
>> instead of just a picture so that it is possible to assign a style in
>> QGIS like it was possible with GRASS via GDAL, reprojection is not yet
>> implemented
>> - WMS: should work like before, the requested SRS does not yet follow
>> current project projection
>> Please test the raster providers branch and let me know about problems:
>> svn co https://svn.osgeo.org/qgis/branches/raster-providers
>> I would like to merge the branch to trunk and continue the work in trunk.
>> Radim
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> --
> Dr. Marco Hugentobler
> Sourcepole -  Linux & Open Source Solutions
> Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
> marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> Technical Advisor QGIS Project Steering Committee

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