[Qgis-developer] Announcing raster-pipes-2 branch for testing

[Etienne Tourigny]

On Fri, Jul 20, 2012 at 4:07 AM, Marco Hugentobler
<marco.hugentobler at sourcepole.ch> wrote:
> Hi Etienne
>
>
>> It just occurred to me that it would be a great thing to implement
>> this as a widget+class in QgisGui, so that it could be used elsewhere
>> (e.g. gdaltools, sextante).
>
>
> Actually the widget is in gui, so you could add a sip file and it should be
> available for plugins too.
>
>
>> Yes - I was also thinking about being able to define defaults for
>> saving rasters (default format, default compression + options per
>> format, tiles) which would be application-wide.
>
>
>> Any way I can help?
>
>
> Help is much appreciated, there are so many things to do.
> It would be great if you can enhance the dialog and raster provider
> interface (create operation) with the capability of format specific options
> (and reasonable defaults).

I was thinking of initially providing a linedit for space-separated
key=value pairs, and then adding a more complex interface with various
format-specific options (like COMPRESS=NONE/DEFLATE/etc) and ui to add
other options (like in some of the gdaltools dialogs).

Is the idea to have this for gdal only, or other providers eventually?
It would be simpler for now to stick to the gdal creation format
(key1=value1 key2=value2), making it more generic might require
considerable work.
I was thinking of passing a QStringList of key=value elements to the
gdal provider create() method, which would be passed on to the
GDALCreate() as a char**  .

>
> @Radim: do you want to grant Etienne write access in your repository or do
> you prefer pull requests?
>
> Regards,
> Marco
>
>
> Am 20.07.2012 00:19, schrieb Etienne Tourigny:
>
>> On Thu, Jul 19, 2012 at 4:09 PM, Marco Hugentobler
>> <marco.hugentobler at sourcepole.ch> wrote:
>>>
>>> Hi Etienne
>>>
>>> Thanks for the feedback, very much appreciated. I've fixed these issues
>>> in
>>> raster-pipes-2 branch now.
>>>
>>> There are still a few things missing in raster saving:
>>> - write colortable to output dataset
>>> - format specific options (e.g. compression)
>>> - dynamic populating of the format combo box (currently hardcoded to
>>> geotiff)
>>> - progress indication for tile based saving and possibility to cancel
>>
>> It just occurred to me that it would be a great thing to implement
>> this as a widget+class in QgisGui, so that it could be used elsewhere
>> (e.g. gdaltools, sextante).
>>
>> Any way I can help?
>>
>>
>>> Regards,
>>> Marco
>>>
>>>
>>> On 18.07.2012 21:12, Etienne Tourigny wrote:
>>>>
>>>> Noticed a few issues with the save dialog
>>>>    1) "format" drop-down is empty
>>>> 2) cannot select a new file
>>>> 3) segfault when saving to an existing file
>>>> 4) It would be nice to have that action in the legend contextual menu,
>>>> like for vector layers.
>>>>
>>>> regards,
>>>> Etienne
>>>>
>>>> On Wed, Jul 18, 2012 at 3:59 PM, Etienne Tourigny
>>>> <etourigny.dev at gmail.com> wrote:
>>>>>
>>>>> That's great news!
>>>>>
>>>>> Concerning raster saving - will there be a mechanism for compressing
>>>>> files?
>>>>> It would be great if default compression schemes could be chosen for
>>>>> different file types, and an option at save time - sort of like image
>>>>> editors.
>>>>>
>>>>> I had trouble building it with external spatialite, could only get it
>>>>> to compile with cmake -DWITH_INTERNAL_SPATIALITE=TRUE - does this
>>>>> require a special version of spatialite?
>>>>>
>>>>> regards,
>>>>> Etienne
>>>>>
>>>>> On Wed, Jul 18, 2012 at 12:13 PM, Marco Hugentobler
>>>>> <marco.hugentobler at sourcepole.ch> wrote:
>>>>>>
>>>>>> Hi devs
>>>>>>
>>>>>> I'd like to announce the branch 'raster-pipes-2' in Radims repository
>>>>>> https://github.com/blazek/Quantum-GIS for testing.
>>>>>> Radim did a great job in refactoring the process of reading /
>>>>>> resampling
>>>>>> /
>>>>>> reprojecting / displaying / modifying raster layers. Every step is now
>>>>>> a
>>>>>> subclass of QgsRasterInterface, with the advantage that several steps
>>>>>> can be
>>>>>> chained in a QgsRasterPipe. Like that, the raster functionality is
>>>>>> nicely
>>>>>> separated into different classes and it is easy to add/remove elements
>>>>>> in
>>>>>> the pipe. The iteration over the raster parts is controlled by
>>>>>> QgsRasterIterator (because for high-resolution prints or analysis on
>>>>>> large
>>>>>> datasets, it is impossible to keep everything in memory at once).
>>>>>>
>>>>>> Please report any issue you find in the branch to the developer
>>>>>> mailing
>>>>>> list.
>>>>>>
>>>>>> Besides the changes in code architecture, there is also a new feature
>>>>>> in
>>>>>> the
>>>>>> raster-pipes-2 branch. It is now possible to write through
>>>>>> QgsRasterDataProvider (currently only supported by the gdal provider).
>>>>>> There
>>>>>> is a 'save as...' function also for rasters now (though it is not 100%
>>>>>> complete at the moment). There is the option to save a raster in one
>>>>>> file or
>>>>>> in tiles (the tiles are then saved in one directory and vrt /
>>>>>> pyramides
>>>>>> are
>>>>>> automatically created. Very usefull for saving the contents of a WMS
>>>>>> layer).
>>>>>>
>>>>>> Regards,
>>>>>> Marco
>>>>>>
>>>>>> --
>>>>>> 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
>>>>>>
>>>>>> _______________________________________________
>>>>>> Qgis-developer mailing list
>>>>>> Qgis-developer at lists.osgeo.org
>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>
>>>
>>>
>>> --
>>> 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
>>>
>
>
> --
> 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
>