[Qgis-developer] Raster layer datasource

[Peter Ersts]

Maurício de Paulo,

Currently there are no public methods in QgsRasterLayer class that 
provide access to pixel level data; the class right now is really not 
much more than a rendered. This is something that has been discussed but 
will likely not be available in the immediate future. Your best approach 
right now would be to open the image with GDAL yourself, process, write 
our a new image, pass that to qgis to load; not idea but all possible 
from within a plugin without too much hassle.

One option that we may consider is to move the GDALDataSetH from private 
to protected so that you could at least inherit QgsRasterLayer to extend 
it yourself.

Please keep us up to date with what you are working on. There are a 
number of users who are interested in similar functionality and it would 
be nice to see some joint effort putting together a nifty raster 
manipulation plugin; components of which can be consider at a later time 
for inclusion to the raster core.

-pete

Maurício de Paulo wrote:
> Ok, i'm new at qgis api but i only found a protected mDataSource 
> property in the QgsRasterLayer class. I hoped i could get access to 
> the actual pixel matrix inside qgis so i could write some image 
> processing simple plugins (IHS, raster band).
> Am i missing something?
> Thanks for reading.
> Maurício de Paulo - Cartographer Engineer.
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-- 
====================================
Peter J. Ersts, Project Specialist
American Museum of Natural History
Center for Biodiversity and Conservation
Central Park West at 79th Street
New York, New York 10024
Tel: Home Office (518)-632-4745 or NYC Office (212)-496-3488
Web: http://biodiversityinformatics.amnh.org
Web: http://cbc.amnh.org

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