?dump2dir and ?setoutput.
extract.lgcpPredict extracts chunks of data that
have been dumped to disk. The subset of data can either
be specified using an (x,y,t,s) box or (window,t,s)
region where window is a polygonal subregion of interest.## S3 method for class 'lgcpPredict':
extract(obj, x = NULL, y = NULL,
t, s = -1, inWindow = NULL, crop2parentwindow = TRUE,
...)