Most radiometers for remote sensing (RS) acquire multispectral images.  Dividing the spectrum into many bands, multispectral is the opposite of panchromatic, which records only the total intensity of radiation falling on each pixel. Usually, Earth observation satellites have three or more radiometers. Each acquires one digital image (in remote sensing, called a scene) in a small spectral band. The bands are grouped into wavelength regions based on the origin of the light and the interests of the researchers.