Hi,
As a non-expert in remote sensing, I would like to calculate the NDVI index from a CIR aerial photograph.
I came across this promising custom transformer on the hub ( NDVICalculator - @dmitribagh ) , but I always get this error message:
_RasterExpressionEvaluator_4 (RasterEvaluationFactory): Input 'B' is referenced in the expression list, but no 'B' feature was provided
I (think I) have an infrared and red band entering the transformer, and I also get a preview of the output of the transformer, but I can't write the result as the translation stops with the fatal error above ...
What could I do wrong (as a FME newbie...)? My workbench with a sample of the aerial photograph attached
Any help much appreciated!
Best answer by becchr
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