ABSTRACT
Radiometric corrections are sometimes used to adjust digital numbers as a preprocessing step before an image is classified. In this chapter, the author learns several simple methods that can be applied for radiometric corrections of errors due to: faulty sensor operation, and atmospheric scattering of radiation. However, there are at least four types of applications where correction for atmospheric effects are extremely important: aquatic applications, ratio adjustments, multi-temporal applications, and multi-sensor applications. Without correcting for atmospheric scattering of radiation, it may not be possible to detect surface water conditions such as chlorophyll concentration. Therefore it is desirable to apply corrections for atmospheric scattering to both images before a change detection method is applied. The simplest approach for adjusting image data due to the additive bias from atmospheric scattering is often called the histogram adjustment technique.
