I want to redefine raster band values, based on another raster band value.
More specific: If raster band 3 has a value "0", raster bands 0, 1 and 2 should have a value "nodata".
How can this be done most efficiently?
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Conditional raster band value
Best answer by lau
Hi Bert,
I have already encountered something similar and fix it with a RasterExpressionEvaluator. I don't remember exactly how I did. You may try:
Red8 --> if(A[3]>0,A[0],-999)
Green8 --> if(A[3]>0,A[1],-999)
Blue8 --> if(A[3]>0,A[2],-999)
After this, add a RasterBandNodataSetter transformer with a Nodata Value = -999
I don't know if it is the most efficient way (and if it works :) )
+3Hi Bert,
I have already encountered something similar and fix it with a RasterExpressionEvaluator. I don't remember exactly how I did. You may try:
Red8 --> if(A[3]>0,A[0],-999)
Green8 --> if(A[3]>0,A[1],-999)
Blue8 --> if(A[3]>0,A[2],-999)
After this, add a RasterBandNodataSetter transformer with a Nodata Value = -999
I don't know if it is the most efficient way (and if it works :) )
lau wrote:
Hi Bert,
I have already encountered something similar and fix it with a RasterExpressionEvaluator. I don't remember exactly how I did. You may try:
Red8 --> if(A[3]>0,A[0],-999)
Green8 --> if(A[3]>0,A[1],-999)
Blue8 --> if(A[3]>0,A[2],-999)
After this, add a RasterBandNodataSetter transformer with a Nodata Value = -999
I don't know if it is the most efficient way (and if it works :) )
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