Technical note: On a slight mis-registration of AVHRR channels 3 and 4

Abstract When using multispectral techniques that exploit the channels of the Advanced Very-High Resolution Radiometer (AVHRR), it is assumed that the radiation measured in the different channels emanates from the same place. Evidence is presented to suggest that for one particular pass of NOAA-7, there was a mis-registration of about one-quarter of a pixel between AVHRR channels 3 and 4. A simple correction is shown to be effective in this case.