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

[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

-- 

Manuel GRIZONNET
CNES - DCT/SI/AP - BPI 1219
18, avenue Edouard Belin
31401 Toulouse Cedex 09 - France
Tel: +33 561 282 630 - Fax: +33 561 283 109


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