Is there an easy way to mask (or flag) data values in R so they do not
get processed. I am using predict.randomForest on a satellite image and
there are a lot (~30%) of pixels with a value of "0" that I'd prefer not
to process with predict.randomForest to save time. I was thinking it
might be possible to create a data frame with valid data for each line
read from the input multi-band image and then reconstruct the line
before writing it out but I think the overhead would be very high. At
least using the brute force methods like rbind.
All the best,
Ned
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