The RS-II 4-channel spectrometer is a portable battery operated instrument. Four filter passbands of channel are corresponding to MSS bands. These indepenc’ent channels can be interchangeably fitted with filter sets that match the TM bands

SPOT’s bands and NOAA’s bands. All 4 spectral channel axes are parallel to each other and to an attached optical gunsight. Thus

a single target can be viewed simultaneously by all 4 channels. The output signals either will be read out by a voltmeter or recorded on a data logging requirement.The instrument was designed for measuring the reflectance of vegetation

soil

water and geological body

etc. It provides ground truth data for interpretation of remote sensing.