landsatTrim(x, ll, ur, debug=getOption("oceDebug"))landsat object, e.g. as read by read.landsat.longitude and latitude, for the lower-left corner of the
portion of the image to retain.longitude and latitude, for the upper-right corner of
the portion of the image to retain.class "landsat", with data having been trimmed in some way.landsat-class explains the structure
of landsat objects, and also outlines the other functions dealing with them.