you can reclassify null values by means of SEXTANTE
QGIS 1.8 --> Analysis --> Sextante toolbox --> SAGA --> Grid Tools -->
Reclassify Grid Values
QGIS dev --> Processing --> Toolbox --> Geoalgorithms --> Raster --> Edition
--> Reclassify Grid Values
it is the same function coming from SAGA.
kee
Dear QGIS Community,
Good Day!
We are currently processing srtm_5 minutes resolution data for asia. We
have polygons (125 features) that covers 9 raster cells each. Our task is
to compute the average cell values using the zonal statistics plugin. In
our data we have negative values and NULL value
