I have QGis1.8.0-Lisboa and the Raster Terrain Analysis Plugin on Mac/OS. When
I want to build a raster layer of an aspect group with the Raster Calculator
(e.g.: "aspect@1>=45 AND aspect@1<135" to do the East raster) that works. I
have the good raster with a band 1 representing truly the East. Same concluding
result with the 2 other exposures using AND (S & W). But for the North I do
"aspect@1>=315 OR aspect@1<45" the resulting file doesn't have any band!
nothing under band1 in Metadata (all is black for this layer on the screen). In
alternative, I want to merge a raster with "aspect@1>=135" and a raster with
"aspect@1<45" (Raster/ Miscellaneous/Merge) (GDAL tool) but it give me a layer
with a band of only one of the 2 values groups ("aspect@1>=135" or
"aspect@1<45")! Sorry for my levels of english and GIS.
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