Hello all
I have been learning to apply GPF tools using snappy module and have been struggling a little in figuring out the syntax of different GPF operators. For example, when I use BandMaths operator in python, I encounter a problem.
The following is the code I used:
targetBand = BandDescriptor()
targetBand.name = ‘CI’
targetBand.type = ‘float32’
targetBand.expression = ‘water ? (reflec_7-reflec_8) + (reflec_9 - reflec_7)*(680-664)/(708-664): NaN’
targetBand.noDataValue=float(“nan”)
targetBand.validExpression=‘CI>0’
targetBands = jpy.array(‘org.esa.snap.core.gpf.common.BandMathsOp$BandDescriptor’, 1)
targetBands[0] = targetBand
params = HashMap()
params.put(‘targetBands’, targetBands)
result = GPF.createProduct(‘BandMaths’, params, product)
I noticed that the ‘target.validExpression’ line is not working. Can someone please provide guidance as to what is the appropriate way to use validExpression by using snappy?