Multispectral Imaging Systems

Abstract

In this chapter we discuss the non-photographic multispectral imaging systems operating in the optical range of the electromagnetic spectrum. The optical range has been defined as that range in which optical phenomena of reflection and refraction can be used to focus the radiation. It extends from X-rays (0.02-µm wavelength) through visible and infrared, reaching up to microwaves (<1-mm wavelength) (Fig. 2.3). However, as the useful region for remote sensing of the Earth lies between 0.35 µm and 14 µm, we largely focus our attention on this specific region. For valuable reviews on non-photographic sensors, see Lowe (1976), Silva (1978), Slater (1980, 1985), Joseph (1996) and Ryerson et al. (1997).