User Manual - pancroma

The default values are 8, 1 and 4, respectively. The Search Extents defines thesize of the sliding window within which PANCROMA TM will use DNs frompanchromatic and multispectral bands to synthesize a single DN.PANCROMA TM will search the target +/- the Search Extents, so the size of thewindow is twice the Search Extents value.The Threshold determines what constitutes missing data. Normally this would bea zero value. If the Threshold is set equal to one, all values less than 1 (i.e. zero)will be considered missing data and any value higher (1 or greater) is consideredvalid data and will not be interpolated. The Threshold can be set higher ifnecessary. (It is advisable to leave it at 1 unless there is a good reason tochange it.)The Comparison Radius value determines how closely a searched pixel must beto the target pixel in order to be considered ‘similar’. The default value is 4,meaning that pixels within 4 levels of the target will be considered similar. Forexample, if the target has value 83 and the Threshold is 4, then coordinates ofpixels with values 79, 80, 81, 82, 83, 84, 85, 86 and 87 will be considered assimilar for purposes of the computation.80