[Qgis-developer] Bringing the raster processing algorithms of the Orfeo Toolbox Monteverdi in QGIS

[Marco Hugentobler]

Hi Manuel

Wow, OTB looks like a very powerfull set of tools and it will certainly be a 
great addition to have a plugin for them in QGIS.

> The proposed architecture is to develop an otbprovider in QGIS modeled
> after the WMSProvider to be able  to add a streamed otb raster layer in
> the Qgis viewer

It is possible to add other raster providers besides the WMS one (see e.g. the 
grass raster provider in src/providers/grass/qgsgrassrasterprovider). 
There is however only drawing support available, e.g. it is not possible to 
access the raster values itself through the raster provider interface (but you 
probably don't need that anyway). The raster system would need some redisign 
for a real generic raster provider support.
PluginLayer (as mentioned by Pirmin) would be another possibility. But then 
you cannot use the desktop tools working on raster layer on them (e.g. raster 
properties dialog, raster symbolisation, raster stat).

Looking forward to meet you at the FOSS4G conference.

Regards,
Marco


Am Donnerstag, 2. September 2010, um 11.42:14 schrieb Manuel GRIZONNET:
> Hi all,
> 
> I am a member of the Orfeo Toolbox Team ( http://www.orfeo-toolbox.org/
> ) and since last year some developments have been made to try to bring
> some OTB functionalities inside Quantum GIS.
> 
> Some OTB plugins (C++) have been develop and there are also developments
> around the integration of  the Monteverdi application as a Qgis plugin.
> Monteverdi is an integrated application allowing to create a complete
> processing (ortho-rectification, segmentation, classification, etc.). It
> allows building processing chains by selecting modules from a set of
> menus. It supports raster and vector data and it is based on  already
> existing OTB filters. Also the architecture takes advantage of the
> streaming and multi-threading capabilities of the OTB pipeline (
> http://www.orfeo-toolbox.org/otb/monteverdi.html. )
> 
> The current OTB-QGIS plugins (as of August 2010) rely on writing the
> data on the disk after processing before reopening it to be available in
> QGIS. The goal is to provide now directly the result of the processing
> without going thought disk writing.
> 
> The proposed architecture is to develop an otbprovider in QGIS modeled
> after the WMSProvider to be able  to add a streamed otb raster layer in
> the Qgis viewer. That's the difficult part...Our provider do not work
> for now but I think that we're not too far from a solution!
> (Technically, there is perhap's the need to define a specific method
> AddRasterLayer for otb layers inside the QgisInterface class...But we
> need to discuss first with members of the qgis team who will have a more
> complete vision of the internal Qgis architecture of data providers...)
> 
> By the way, we'll present the Orfeo Toolbox and the latest developments
> around the library at FOSS4G2010 in Barcelona next week:
> http://2010.foss4g.org/presentations_show.php?id=3655
> 
> We will be glad to discuss with QGIS developers about these topics
> during the conference!
> 
> The source code of this project, based on the Orfeo Toolbox can be found
> here : http://hg.orfeo-toolbox.org/OTB-Qgis-plugins/
> Informations and current state of developments can also be found on our
> wiki : http://wiki.orfeo-toolbox.org/index.php/Quantum_GIS_plugins
> 
> Best regards,
> 
> Manuel


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Webereistrasse 66, 8134 Adliswil, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee