AFAIK in QGIS API there are no methods for modifying raster cells. To learn about querying raster values look at qgsmaptoolidentify.cpp file in QGIS source tree.
If you want not only read pixel values but modify them, look at GDAL and NumPy. On Thu, 24 Feb 2011 16:36:01 +0100 andr...@gmx.de wrote: > Hello, > I would like to write a qgis python plugin, which modifies cell values based > on the values of their surrounding neighbors. > > But how can I iterate over a raster layer in order to read the value of each > raster cell (and its surrounding neighbors)? > Is there any method querying raster cell values > > for i in range (1, numberofrows) > for j in range (1, numberofcolumns) > > value=??? #read cell value of cell[i j] > > > Thank you very much in advance. > -- > GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit > gratis Handy-Flat! http://portal.gmx.net/de/go/dsl > _______________________________________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-developer -- Alexander Bruy _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
