I need to smooth a collection of annual NDVI time-series data for a fairly large image. Right now I am using an interruptive method that compares the difference between each point and the mean of its two neighbors. This process repeats until a threshold is reached. It works well, but it takes a long time. When I process the image without smoothing the data it takes about 2 hours – with the smoothing it looks like it will take up to 7 days.

The method needs to elevate troughs in the data but retain the peaks – I assume that any troughs are really cloud contamination and that the peaks are accurate NDVI values. Does anyone know of such a smoother that isn't so time consuming?


Jonathan B. Thayn, Ph.D.
Illinois State University
Department of Geography - Geology
200A Felmley Hall
Normal, Illinois 61790-4400

(309) 438-8112
jthayn@ilstu.edu
my.ilstu.edu/~jthayn






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